{"product_id":"qds8-dc-high-speed-circuit-breaker","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; Vibration Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eClass 1, Category B\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 setting\u003c\/li\u003e\n\u003cli\u003eHigh rated short-circuit making and breaking capacity\u003c\/li\u003e\n\u003cli\u003eElectromagnetic closing, electrical latching — significantly reduced energy consumption\u003c\/li\u003e\n\u003cli\u003e6 double-contact auxiliary contacts for versatile application\u003c\/li\u003e\n\u003cli\u003eExcellent shock and vibration resistance\u003c\/li\u003e\n\u003cli\u003eLow contact wear, 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\u003cli\u003eCompact and lightweight design\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 25890.2 — Railway Applications: Ground DC Switchgear, Part 2: DC Circuit Breakers\u003c\/li\u003e\n\u003cli\u003eGB\/T 21413.1\/2\/3 — Railway Applications: Rolling Stock Electrical Equipment\u003c\/li\u003e\n\u003cli\u003eGB\/T 21563-2008 — Shock and Vibration Tests for Railway Rolling Stock\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":43941302370370,"sku":null,"price":15000.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/QDS8-1.jpg?v=1783574262","url":"https:\/\/wanlongelectric.com\/zh\/products\/qds8-dc-high-speed-circuit-breaker","provider":"Wan Long Electric Group Co., Ltd.","version":"1.0","type":"link"}