{"product_id":"wlds1-dc-fast-circuit-breaker","title":"WLDS1 DC Fast Circuit Breaker | Metro \u0026 Traction DC Power Protection","description":"\u003ch2\u003eWLDS1 DC Fast Circuit Breaker\u003c\/h2\u003e\u003cp\u003eThe WLDS1 is a unipolar, bidirectional DC fast circuit breaker engineered for short-circuit and overload protection in metro, light rail, tram, and industrial electric traction systems. 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","url":"https:\/\/wanlongelectric.com\/zh\/products\/wlds1-dc-fast-circuit-breaker","provider":"Wan Long Electric Group Co., Ltd.","version":"1.0","type":"link"}