QDS8 DC High-Speed Circuit Breaker | Rail Traction & Industrial DC Protection
QDS8 DC High-Speed Circuit Breaker | Rail Traction & Industrial DC Protection
This is a custom-made product. Please contact us to discuss your specifications and receive a quotation.
Description
QDS8 DC High-Speed Circuit Breaker
The 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.
Key Applications
- DC Feeder Traction Power: Protects contact wires and rails against insulation faults, short circuits, and overloads. Compatible with line fault detection circuits for auto-reclosing.
- Traction Vehicles: Compact design with excellent shock and vibration resistance — suitable for direct installation in vehicle switchboards or high-voltage enclosures.
- Power Semiconductor Equipment: Current-limiting characteristics provide highly sensitive protection for static converter devices before fault currents stabilize.
- DC Rotating Machinery: Ensures reliable closing during commutation intervals and immediate fault clearance with auto-reclose capability for industrial rolling mills.
Technical Specifications
| Rated Working Voltage | DC900V / DC1800V |
| Maximum Working Voltage | DC1000V / DC2000V |
| Rated Insulation Voltage | DC2300V |
| Rated Current | 1250A |
| Rated Short-Circuit Breaking Capacity | 30kA/15ms, 30kA/40ms, 30kA/100ms, 17kA/0ms |
| Electrical Life | 1,000 operations |
| Mechanical Life | ≥500,000 operations |
| Coil Operating Voltage | DC24V / 48V / 110V / 220V |
| Dimensions (L×W×H) | 420×165×340mm (DC900V) / 420×165×485mm (DC1800V) |
| Weight | 27kg (DC900V) / 37kg (DC1800V) |
| Shock & Vibration Rating | Class 1, Category B |
Product Highlights
- High insulation class — overvoltage category OV4
- Convenient overcurrent trip setting
- High rated short-circuit making and breaking capacity
- Electromagnetic closing, electrical latching — significantly reduced energy consumption
- 6 double-contact auxiliary contacts for versatile application
- Excellent shock and vibration resistance
- Low contact wear, high arc-quenching performance — suitable for C3 (heavy-duty) duty cycle
- High mechanical and electrical life; simple structure, low maintenance
- Compact and lightweight design
Standards Compliance
- GB/T 25890.1 — Railway Applications: Ground DC Switchgear, Part 1: General
- GB/T 25890.2 — Railway Applications: Ground DC Switchgear, Part 2: DC Circuit Breakers
- GB/T 21413.1/2/3 — Railway Applications: Rolling Stock Electrical Equipment
- GB/T 21563-2008 — Shock and Vibration Tests for Railway Rolling Stock
OEM/ODM available. Contact Wanlong Electric for custom specifications, volume pricing, and technical support.
Care
To maintain the beauty and integrity of your purchase, we recommend treating it with care. Simple maintenance practices, such as gentle washing and proper storage, can effectively preserve the longevity of your favorites. We encourage you to refer to the care instructions included with each item, designed to help you keep your purchase in top condition.
Design
Our dedication to excellence extends beyond materials; it encompasses the artistry and craftsmanship illustrated in every piece we create.