{"title":"DC Switching Devices | 直流开关元器件","description":"\u003cp\u003eDC switching devices are low-voltage electrical components specifically designed to make, carry, and break direct current (DC) circuits. Unlike AC switching devices, DC switchgear must incorporate forced arc-quenching mechanisms and observe strict polarity requirements due to the non-zero-crossing nature of DC current.\u003c\/p\u003e\n\n\u003ch2\u003eKey Characteristics\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eForced Arc Quenching\u003c\/strong\u003e — DC current has no natural zero crossing, requiring dedicated arc suppression technology to safely interrupt the circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolarity Sensitivity\u003c\/strong\u003e — DC switching devices must be installed and operated with correct polarity to ensure safe and reliable performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Breaking Capacity\u003c\/strong\u003e — Engineered to handle the sustained energy of DC fault currents in traction, mining, and industrial power systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMine DC traction power distribution systems\u003c\/li\u003e\n\u003cli\u003eDC traction substations and feeder circuits\u003c\/li\u003e\n\u003cli\u003eIndustrial DC power supply and control systems\u003c\/li\u003e\n\u003cli\u003eRenewable energy and battery storage systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose Wan Long Electric\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpecialized in DC switching devices for mining and industrial applications\u003c\/li\u003e\n\u003cli\u003eFactory-direct from Suzhou, China — OEM and custom configurations available\u003c\/li\u003e\n\u003cli\u003eModbus RTU \/ RS485 communication support for SCADA integration\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"automatic-transfer-switch-ats","title":"Automatic Transfer Switch (ATS) | Dual Power Changeover","description":"\u003ch2\u003eAutomatic Transfer Switch (ATS) — China Manufacturer \u0026amp; Supplier\u003c\/h2\u003e\n\u003cp\u003eWanlong Electric is a professional \u003cstrong\u003eautomatic transfer switch manufacturer\u003c\/strong\u003e and \u003cstrong\u003eAC dual power changeover switch supplier\u003c\/strong\u003e based in Suzhou, China. Our ATS products are factory-direct, IEC-certified, and trusted by industrial buyers, data center operators, and EPC contractors worldwide.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose Wanlong Electric as Your ATS Supplier?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eFactory Direct\u003c\/strong\u003e — Competitive pricing, no intermediaries\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eIEC 60947-6-1 Certified\u003c\/strong\u003e — International standard for transfer switching equipment\u003c\/li\u003e\n  \u003cli\u003e⚡ \u003cstrong\u003eFast Transfer Time\u003c\/strong\u003e — \u0026lt;100ms (PC class) or \u0026lt;60ms (CB class)\u003c\/li\u003e\n  \u003cli\u003e📞 \u003cstrong\u003eEnglish Technical Support\u003c\/strong\u003e — Pre-sales and after-sales within 24 hours\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003eOEM\/ODM Available\u003c\/strong\u003e — Custom configurations and branding\u003c\/li\u003e\n  \u003cli\u003e🚚 \u003cstrong\u003eFast Delivery\u003c\/strong\u003e — Standard orders ship within 7 days\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Current:\u003c\/strong\u003e 63A to 3200A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e PC class (load-switching) and CB class (circuit-breaker based)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransfer Time:\u003c\/strong\u003e \u0026lt;100ms (PC class), \u0026lt;60ms (CB class)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 3-phase 380V\/400V\/415V AC; single-phase 220V\/230V AC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eController:\u003c\/strong\u003e Intelligent microprocessor with LCD display\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommunication:\u003c\/strong\u003e RS485 \/ Modbus RTU\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFeatures:\u003c\/strong\u003e Dual power monitoring, manual override, programmable time delays\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e IEC 60947-6-1\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eData centers and server rooms requiring uninterrupted power\u003c\/li\u003e\n  \u003cli\u003eHospitals and healthcare facilities (critical power systems)\u003c\/li\u003e\n  \u003cli\u003eIndustrial plants with generator backup power\u003c\/li\u003e\n  \u003cli\u003eCommercial buildings and infrastructure projects\u003c\/li\u003e\n  \u003cli\u003eMining and petrochemical facilities\u003c\/li\u003e\n  \u003cli\u003eUtility substations and power distribution systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCertifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eIEC 60947-6-1\u003c\/li\u003e\n  \u003cli\u003eCE marking available\u003c\/li\u003e\n  \u003cli\u003eCCC certification (China Compulsory Certification)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eLooking for a reliable automatic transfer switch manufacturer or AC dual power changeover switch supplier in China? Contact Wanlong Electric for factory-direct pricing, technical datasheets, or OEM inquiries.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Wan Long Electric","offers":[{"title":"Default Title","offer_id":43882460446786,"sku":null,"price":210.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/AutomaticTransferSwitches.jpg?v=1782956688"},{"product_id":"wldg2-dc-disconnector-switch","title":"WLDG2 DC Disconnector Switch | High-Voltage DC Isolation Device","description":"\u003ch2\u003eWLDG2 DC Disconnector Switch\u003c\/h2\u003e\u003cp\u003eThe WLDG2 is a DC disconnector (isolating switch) designed to provide safe, visible isolation of high-voltage DC circuits in traction power substations, industrial power systems, and energy infrastructure. When maintenance or inspection is required, the WLDG2 ensures a clear, verifiable break in the circuit — protecting personnel and equipment with confidence.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible Break Isolation:\u003c\/strong\u003e Provides a clear, verifiable open-circuit position for safe maintenance operations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh DC Voltage Rating:\u003c\/strong\u003e Suitable for traction substation and industrial DC power applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLockable in Open Position:\u003c\/strong\u003e Supports lockout\/tagout (LOTO) safety procedures\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Insulation:\u003c\/strong\u003e High dielectric strength to withstand DC system transient overvoltages\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Contact Resistance:\u003c\/strong\u003e Minimizes power loss during normal operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Panel-Mount Design:\u003c\/strong\u003e Suitable for integration into DC switchgear cabinets and distribution boards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDC traction power substations (metro, light rail, tram)\u003c\/li\u003e\n\u003cli\u003eIndustrial DC power distribution and isolation\u003c\/li\u003e\n\u003cli\u003eSemiconductor rectifier and converter equipment maintenance isolation\u003c\/li\u003e\n\u003cli\u003eEnergy storage system service disconnection\u003c\/li\u003e\n\u003cli\u003eRailway ground power infrastructure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eStandards Compliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 25890.1 — Railway Applications: Ground DC Switchgear, Part 1: General\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.3 — Low-voltage switchgear: Switches, disconnectors, switch-disconnectors and fuse-combination units (IEC 60947-3)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM\/ODM available.\u003c\/strong\u003e Contact Wanlong Electric for detailed technical specifications, custom configurations, and volume pricing.\u003c\/p\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43941301682242,"sku":null,"price":5800.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/Automatic_Transfer_Switches_ATS.jpg?v=1783304470"},{"product_id":"wlcz1-dc-electromagnetic-contactor","title":"WLCZ1 DC Electromagnetic Contactor | High-Voltage DC Switching Device","description":"\u003ch2\u003eWLCZ1 DC Electromagnetic Contactor\u003c\/h2\u003e\u003cp\u003eThe WLCZ1 is a DC electromagnetic contactor designed for reliable switching and control of high-voltage DC circuits in traction power systems, industrial applications, and energy storage equipment. Built to withstand demanding operating environments, it delivers consistent performance with long electrical and mechanical service life.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Electromagnetic Operation:\u003c\/strong\u003e Fast, reliable switching response with low energy consumption during holding state\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Insulation Rating:\u003c\/strong\u003e Suitable for high-voltage DC applications including traction and industrial power systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong Service Life:\u003c\/strong\u003e Engineered for high-frequency switching with minimal maintenance requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Design:\u003c\/strong\u003e Space-efficient construction for integration into switchgear panels and control cabinets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Coil Voltage Range:\u003c\/strong\u003e Available in multiple DC coil voltage options to suit various control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Construction:\u003c\/strong\u003e Resistant to vibration and shock for reliable operation in mobile and industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDC traction power distribution and feeder circuits\u003c\/li\u003e\n\u003cli\u003eIndustrial DC motor control and protection\u003c\/li\u003e\n\u003cli\u003eEnergy storage system switching and isolation\u003c\/li\u003e\n\u003cli\u003eSemiconductor rectifier and converter equipment\u003c\/li\u003e\n\u003cli\u003eRailway and metro ground power infrastructure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eStandards Compliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 14048.4 — Low-voltage switchgear and controlgear: AC contactors and motor starters (IEC 60947-4)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.5 — Control circuit devices and switching elements (IEC 60947-5-1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM\/ODM available.\u003c\/strong\u003e Contact Wanlong Electric for detailed technical specifications, custom configurations, and volume pricing.\u003c\/p\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43941301911618,"sku":null,"price":5800.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/DS16_40b47e7a-e9b0-48da-9e10-f96b7cdde3cd.jpg?v=1783585500"},{"product_id":"qds8直流高速断路器","title":"QDS8 DC High-Speed Circuit Breaker | Rail Traction \u0026 Industrial DC Protection","description":"\u003ch2\u003eQDS8 DC High-Speed Circuit Breaker\u003c\/h2\u003e\u003cp\u003eThe QDS8 is a unipolar, bidirectional DC high-speed circuit breaker designed for short-circuit and overload protection in metro, light rail, tram, and industrial electric traction systems. Rated up to DC1800V and 1250A, it delivers fast interruption before fault currents reach steady-state values — protecting both power semiconductors and rotating DC machinery.\u003c\/p\u003e\u003ch3\u003eKey Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Feeder Traction Power:\u003c\/strong\u003e Protects contact wires and rails against insulation faults, short circuits, and overloads. Compatible with line fault detection circuits for auto-reclosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraction Vehicles:\u003c\/strong\u003e Compact design with excellent shock and vibration resistance — suitable for direct installation in vehicle switchboards or high-voltage enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Semiconductor Equipment:\u003c\/strong\u003e Current-limiting characteristics provide highly sensitive protection for static converter devices before fault currents stabilize.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Rotating Machinery:\u003c\/strong\u003e Ensures reliable closing during commutation intervals and immediate fault clearance with auto-reclose capability for industrial rolling mills.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Working Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC900V \/ DC1800V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Working Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC1000V \/ DC2000V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Insulation Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC2300V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1250A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Short-Circuit Breaking Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30kA\/15ms, 30kA\/40ms, 30kA\/100ms, 17kA\/0ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eElectrical Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1,000 operations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMechanical Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥500,000 operations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Operating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC24V \/ 48V \/ 110V \/ 220V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (L×W×H)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e420×165×340mm (DC900V) \/ 420×165×485mm (DC1800V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e27kg (DC900V) \/ 37kg (DC1800V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShock \u0026amp; 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Rated up to DC1800V and 4000A with a rated short-circuit current of 90kA\/100ms, it delivers rapid fault interruption — protecting semiconductor rectifiers and traction power infrastructure before damage occurs.\u003c\/p\u003e\u003ch3\u003eKey Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Feeder Traction Power:\u003c\/strong\u003e Protects contact wires and rails against insulation faults and short circuits. Compatible with line fault detection circuits for automatic reclosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraction Vehicles:\u003c\/strong\u003e Compact design with high shock and vibration resistance — suitable for direct installation in vehicle switchboards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Semiconductor Equipment:\u003c\/strong\u003e Current-limiting characteristics provide sensitive protection for static converter devices, interrupting fault current before it reaches steady-state values.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Rotating Machinery:\u003c\/strong\u003e Ensures reliable closing during commutation intervals and immediate fault clearance with auto-reclose capability for industrial rolling mills.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Working Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC900V \/ DC1800V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Working Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC1000V \/ DC2000V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Insulation Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC3000V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4000A \/ 2500A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Short-Circuit Current \/ Time Constant\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90kA \/ 100ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Short-Circuit Making Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e128kA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eElectrical Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1,000 operations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMechanical Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥50,000 operations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Operating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC24V \/ 48V \/ 110V \/ 220V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (L×W×H)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e756 × 380 × 835 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e115 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eProduct Highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHigh insulation class — overvoltage category OV4\u003c\/li\u003e\n\u003cli\u003eConvenient overcurrent trip value setting\u003c\/li\u003e\n\u003cli\u003eHigh rated short-circuit making and breaking capacity (128kA)\u003c\/li\u003e\n\u003cli\u003eElectromagnetic closing, electrical latching — significantly reduced energy consumption\u003c\/li\u003e\n\u003cli\u003e5 double-contact auxiliary contacts for versatile application requirements\u003c\/li\u003e\n\u003cli\u003eLow contact wear and high arc-quenching performance — suitable for C3 (heavy-duty) duty cycle\u003c\/li\u003e\n\u003cli\u003eHigh mechanical and electrical life; simple structure, low maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eStandards Compliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 25890.1-2010 — Railway Applications: Ground DC Switchgear, Part 1: General\u003c\/li\u003e\n\u003cli\u003eGB\/T 25890.2-2010 — Railway Applications: Ground DC Switchgear, Part 2: DC Circuit Breakers\u003c\/li\u003e\n\u003cli\u003eGB\/T 21413.1\/2\/3-2008 — Railway Applications: Rolling Stock Electrical Equipment\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM\/ODM available.\u003c\/strong\u003e Contact Wanlong Electric for custom specifications, volume pricing, and technical support.\u003c\/p\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43941303713858,"sku":null,"price":15000.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/DS16_57e68245-6010-4f93-8831-6111378de443.jpg?v=1783585452"},{"product_id":"ysa2-intelligent-air-circuit-breaker","title":"YSA2 Intelligent Air Circuit Breaker (ACB) | 400A–6300A Smart Power Distribution","description":"\u003ch2\u003eYSA2 Intelligent Air Circuit Breaker (ACB)\u003c\/h2\u003e\u003cp\u003eThe YSA2 is a high-capacity intelligent air circuit breaker (ACB) designed for AC 50Hz power distribution networks, wind farm transformer substations, and main tower power systems. Rated from 400A to 6300A at 400V\/690V, it combines advanced multi-protection functions with smart bus communication — enabling full remote monitoring and control as a terminal element in power distribution automation systems.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntelligent Bus-Type Controller:\u003c\/strong\u003e Modular smart controller as the central processing unit; supports Modbus, Profibus-DP, and DeviceNet fieldbus protocols\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Powered Control Circuit:\u003c\/strong\u003e Operates reliably even when auxiliary power fails — ensures protection during overload, overcurrent, or short-circuit faults\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Remote Functions (四遥):\u003c\/strong\u003e Remote telemetry, remote signaling, remote control, and remote adjustment via upper-level SCADA systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eATS Compatibility:\u003c\/strong\u003e Works with mechanical interlock (dual-lock) for automatic source transfer switching; supports real-time monitoring and fire alarm control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelective Protection:\u003c\/strong\u003e High-precision selective protection improves power supply reliability across distribution networks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation Function:\u003c\/strong\u003e Can be used as an isolating switch in addition to circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400A – 6300A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Insulation Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1000V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Working Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400V \/ 690V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Protocols\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eModbus RTU, Profibus-DP, DeviceNet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtection Functions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOverload, undervoltage, short-circuit, single-phase ground fault\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eStandards Compliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 14048.1 — Low-voltage switchgear, Part 1: General (IEC 60947-1)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.2 — Low-voltage circuit breakers (IEC 60947-2)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.5 — Control circuit devices (IEC 60947-5-1)\u003c\/li\u003e\n\u003cli\u003eGB\/T 20645 — Low-voltage electrical apparatus for high-altitude environments\u003c\/li\u003e\n\u003cli\u003eJB\/Z 19582.1\/2\/3 — Modbus application protocol specifications\u003c\/li\u003e\n\u003cli\u003eGB\/T 18858.3 — DeviceNet CDI interface standard\u003c\/li\u003e\n\u003cli\u003eGB\/T 20540 — Profibus-DP fieldbus specification\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM\/ODM available.\u003c\/strong\u003e Contact Wanlong Electric for custom specifications, volume pricing, and technical support.\u003c\/p\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43944104034370,"sku":null,"price":12000.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/YSA2-3.jpg?v=1783585346"},{"product_id":"ysk2-integrated-motor-control-protection","title":"YSK2 Integrated Motor Control \u0026 Protection Device | 1.25A–125A All-in-One","description":"\u003ch2\u003eYSK2 Integrated Motor Control \u0026amp; Protection Device\u003c\/h2\u003e\u003cp\u003eThe YSK2 is a highly integrated motor control and protection device that combines the functions of an isolator, circuit breaker (or fuse), contactor (reversible contactor), thermal relay (intelligent motor controller), current transformer, transducer, multi-function meter, residual current protection, and programmable DDC\/PLC — all in a single compact unit. Designed for AC 50\/60Hz systems up to 690V and 1.25A–125A, it dramatically simplifies motor protection and control circuits while improving reliability and reducing installation costs.\u003c\/p\u003e\u003ch3\u003eProduct Variants\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYSK2L-63 (Standard \/ Motor Protection):\u003c\/strong\u003e LED indicators, rotary setpoint adjustment. Suitable for conventional current-type motor protection and start\/stop control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYSK2M-63 (Intelligent \/ Motor Protection):\u003c\/strong\u003e LED + LCD display, button-based setpoint viewing and adjustment. Ideal for field parameter inspection and historical fault query.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYSK2S-63 \/ YSK2S-125 (Enhanced \/ Motor Protection):\u003c\/strong\u003e LED indicators + separate ST521LS measurement panel for parameter viewing, setpoint configuration, and fault history. Full motor protection, measurement, control, monitoring, maintenance, and communication functions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYSK2P-63 \/ YSK2P-125 (Intelligent Distribution):\u003c\/strong\u003e LED indicators + ST521LP measurement panel. Full feeder load protection, measurement, control, monitoring, maintenance, and communication functions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHighly Integrated:\u003c\/strong\u003e Replaces isolator, breaker, contactor, thermal relay, transformer, transducer, multi-function meter, RCD, and PLC in a single device — dramatically reduces circuit complexity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Application:\u003c\/strong\u003e Multi-CPU modular platform with shared data across all products and modules; flexible, fast configuration and programming for diverse control requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Protection:\u003c\/strong\u003e Overload, overcurrent, short-circuit, current imbalance, single-phase ground fault, residual current, under\/overvoltage, voltage imbalance, phase reversal, start stall, blockage, underload, negative sequence current, busbar overtemperature, and electrical fire alarm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRich Communication Interfaces:\u003c\/strong\u003e Remote 4G\/5G, near-field wireless (WiFi\/Bluetooth), and fieldbus (Modbus, Profibus-DP) for full lifecycle information management\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy Efficiency:\u003c\/strong\u003e Exceeds Class 2 energy efficiency standards; eliminates intermediate wiring in motor circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable I\/O:\u003c\/strong\u003e Internal bus expansion for programmable I\/O control modules to implement complex logic control\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eStandards Compliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 14048.4 — AC contactors and motor starters (IEC 60947-4)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.5 — Control circuit devices (IEC 60947-5-1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM\/ODM available.\u003c\/strong\u003e Contact Wanlong Electric for custom specifications, volume pricing, and technical support.\u003c\/p\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43944129265730,"sku":null,"price":560.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/YSK2.jpg?v=1783566594"},{"product_id":"ysa4-intelligent-air-circuit-breaker","title":"YSA4 Intelligent Air Circuit Breaker (ACB) | 200A–1600A Smart Distribution","description":"\u003ch2\u003eYSA4 Intelligent Air Circuit Breaker (ACB)\u003c\/h2\u003e\u003cp\u003eThe YSA4 is a compact intelligent air circuit breaker (ACB) for AC 50Hz power distribution networks, wind farm transformer substations, and main tower power systems. Rated from 200A to 1600A at 400V\/690V, it integrates advanced multi-protection functions with smart bus communication — enabling full remote monitoring and control as a terminal element in power distribution automation systems.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntelligent Bus-Type Controller:\u003c\/strong\u003e Modular smart controller as the central processing unit; supports Modbus, Profibus-DP, and DeviceNet fieldbus protocols\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Powered Control Circuit:\u003c\/strong\u003e Operates reliably even when auxiliary power fails — ensures protection during overload, overcurrent, or short-circuit faults\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Remote Functions (四遥):\u003c\/strong\u003e Remote telemetry, remote signaling, remote control, and remote adjustment via upper-level SCADA systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eATS Compatibility:\u003c\/strong\u003e Works with mechanical interlock (dual-lock) for automatic source transfer switching; supports real-time monitoring and fire alarm control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelective Protection:\u003c\/strong\u003e High-precision selective protection improves power supply reliability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation Function:\u003c\/strong\u003e Can be used as an isolating switch in addition to circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200A – 1600A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Insulation Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1000V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Working Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400V \/ 690V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Protocols\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eModbus RTU, Profibus-DP, DeviceNet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtection Functions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOverload, undervoltage, short-circuit, single-phase ground fault\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eStandards Compliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 14048.1 — Low-voltage switchgear, Part 1: General (IEC 60947-1)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.2 — Low-voltage circuit breakers (IEC 60947-2)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.5 — Control circuit devices (IEC 60947-5-1)\u003c\/li\u003e\n\u003cli\u003eGB\/T 20645 — Low-voltage electrical apparatus for high-altitude environments\u003c\/li\u003e\n\u003cli\u003eJB\/Z 19582.1\/2\/3 — Modbus application protocol specifications\u003c\/li\u003e\n\u003cli\u003eGB\/T 18858.3 — DeviceNet CDI interface standard\u003c\/li\u003e\n\u003cli\u003eGB\/T 20540 — Profibus-DP fieldbus specification\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM\/ODM available.\u003c\/strong\u003e Contact Wanlong Electric for custom specifications, volume pricing, and technical support.\u003c\/p\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43944166195266,"sku":null,"price":8900.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/YSA4.jpg?v=1783585256"},{"product_id":"ysm5-molded-case-circuit-breaker-mccb","title":"YSM5 Molded Case Circuit Breaker (MCCB) | 16A–800A AC400V–690V","description":"\u003ch2\u003eYSM5 Molded Case Circuit Breaker (MCCB)\u003c\/h2\u003e\u003cp\u003eThe YSM5 is a new-generation molded case circuit breaker (MCCB) developed to international standards with advanced manufacturing technology. Designed for AC 50\/60Hz power distribution networks rated at 400V and 690V, it provides reliable overload, short-circuit, and undervoltage protection for circuits and power equipment from 16A to 800A. The YSM5 can also be used for infrequent switching of circuits under normal operating conditions.\u003c\/p\u003e\u003ch3\u003eProduct Range\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e24 rated current specifications\u003c\/strong\u003e across 6 frame sizes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2–3 breaking capacity levels\u003c\/strong\u003e per frame for flexible selection\u003c\/li\u003e\n\u003cli\u003eOperational breaking capacity: Ics = 22–75kA (selectable)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; High Breaking Capacity:\u003c\/strong\u003e Small footprint with high short-circuit breaking performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero Arc Flash Option:\u003c\/strong\u003e Install zero arc flash cover to achieve zero arc flash operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Mounting:\u003c\/strong\u003e Supports both vertical (upright) and horizontal installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation Function:\u003c\/strong\u003e Equipped with isolation capability (symbol: —×)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal-Magnetic Protection:\u003c\/strong\u003e Long-time delay overload protection + instantaneous short-circuit protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Altitude Rated:\u003c\/strong\u003e Suitable for altitudes up to 2000m; derating table available for higher altitudes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Temperature Range:\u003c\/strong\u003e −20°C to +70°C operating range; special orders available for −25°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Resistance:\u003c\/strong\u003e Resistant to humidity, mold, salt spray, and oil mist\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Current Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16A – 800A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Working Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 400V \/ 690V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Insulation Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e800V (160A frame) \/ 1000V (125–800A frames)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperational Breaking Capacity (Ics)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e22–75kA (selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrame Sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6 frame levels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMain circuit: Category III; Auxiliary circuit: Category II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Altitude\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2000m (derating required above 2000m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eStandards Compliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 14048.1 — Low-voltage switchgear, Part 1: General (IEC 60947-1)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.2 — Low-voltage circuit breakers (IEC 60947-2)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.4 — AC contactors and motor starters (IEC 60947-4)\u003c\/li\u003e\n\u003cli\u003eGB\/T 14048.5 — Control circuit devices (IEC 60947-5-1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM\/ODM available.\u003c\/strong\u003e Contact Wanlong Electric for custom specifications, volume pricing, and technical support.\u003c\/p\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43944254996546,"sku":null,"price":240.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/YSM5_df90ef11-c69f-4ce5-88d1-b3f92584913c.jpg?v=1783585299"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/collections\/Automatic_Transfer_Switches_6db279a7-0989-4fb4-9684-392a9d77648d.jpg?v=1782787373","url":"https:\/\/wanlongelectric.com\/collections\/dc-switching-devices.oembed","provider":"Wan Long Electric Group Co., Ltd.","version":"1.0","type":"link"}