Product Introduction
The BSBC8V-400C is a robust and compact 400A DC contactor for EV designed to safely switch high-voltage DC circuits up to 1000VDC. Featuring a ceramic-sealed gas-filled contact chamber, this model ensures arc-free switching and excellent electrical endurance, making it ideal for battery disconnects, motor controllers, pre-charge loops, and power distribution systems in electric vehicles. Its short-circuit endurance, vibration resistance, and long mechanical life make it a trusted choice in EV platforms.
Product Features
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Rated 400A @ 1000VDC – For high-power EV battery, motor, and inverter applications.
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Ceramic-Sealed Housing – Delivers high dielectric strength, insulation, and arc suppression.
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Overload and Short-Circuit Performance:
– 600A for 360s
– 800A for 180s
– 1200A for 30s
– 1500A breaking @ 1000VDC (1 op)
– 8000A @ 5ms short-circuit tolerance -
Auxiliary Contact – Not included in this version (can be customized).
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No Polarity Design – For both load and coil terminals.
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Lightweight and Compact – Only ~360g, perfect for EV space-constrained assemblies.
Typical Applications
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EV battery disconnect units (BDU)
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High voltage inverter-side switching
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Pre-charge relay for DC bus systems
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EV traction motor isolation
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Hybrid and fuel-cell electric power control
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Model | BSBC8V-400C |
| Rated Current | 400A (≥200 mm² wire) |
| Rated Voltage | 12–1000VDC |
| Max Breaking Current | 1500A @ 1000VDC (1 operation) |
| Electrical Life | 400A @ 1000VDC: 50 ops 400A @ 750VDC: 150 ops 400A @ 450VDC: 500 ops 140A @ 20VDC (make): 75,000 ops |
| Mechanical Life | 200,000 operations |
| Coil Voltage | 12VDC / 24VDC (single-coil) |
| Coil Resistance | 24Ω (12V) / 96Ω (24V) |
| Power Consumption | 6W |
| Operate / Release Time | ≤30ms / ≤10ms |
| Bounce Time | ≤5ms |
| Contact Resistance | ≤0.5 mΩ |
| Insulation Resistance | ≥1000 MΩ @ 1000VDC |
| Dielectric Strength | 3000VAC (coil-to-contact and contact open) |
| Shock Resistance | 196 m/s² (off), 588 m/s² (on) |
| Vibration | 49 m/s² (10–500Hz) |
| Mounting | Vertical |
| Weight | Approx. 360g ±15g |
Dimensional Drawing & Wiring Diagram
Connector Horizontal Lead-Out Type
Connector Vertical Lead-Out Type
FAQs About The BSBC8V-400A High Voltage DC Contactor
Q1: Can the BSBC8V-400C be used continuously at 1000VDC?
A1: Yes. The contactor is rated for continuous operation at up to 1000VDC and 400A.
Q2: Does this model include an auxiliary contact?
A2: No, the standard BSBC8V-400C does not include an auxiliary contact, but customized versions can be provided.
Q3: What’s the short-circuit and overload capacity?
A3: It can handle 1500A breaking @ 1000VDC (1 op) and tolerate 8000A at 5ms without damage.
Precautions for Use
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Installation:
– M6 terminals: 6–8 N·m torque
– M5 mounting screws: 3–4 N·m
– Use spring + flat washers -
Inductive Loads (L/R ≥ 1ms): Add TVS or varistors to suppress back EMF.
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Capacitive Loads: Use pre-charge circuit; limit closing voltage differential to ≤20V.
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Coil Protection: Avoid diodes. Use TVS for faster release and protection.
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Temperature Range: -40°C to +85°C. Exceeding may reduce internal gas pressure and cause failure.
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Avoid: Strong magnetic fields, nearby heating elements, grease on terminals.
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Do Not Reuse: If the product has been dropped.
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Storage: ≤12 months; away from sunlight and corrosive gases.