Product Introduction
The BSBC8V-300C is a high-reliability 300A DC contactor for EV applications, specifically designed to handle up to 1000VDC in high-voltage electric vehicle systems. Featuring a ceramic-sealed, gas-filled contact chamber, this contactor ensures arc-free switching, long service life, and stable operation under continuous high-current conditions. Whether integrated into EV battery disconnects, inverter circuits, or pre-charge loops, the BSBC8V-300C guarantees electrical safety and compact efficiency.
Product Features
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300A Rated Current, 1000VDC Operation – Ideal for high-power EV circuits
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Ceramic Sealed Housing – Offers superior insulation, arc suppression, and environmental resistance
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Short Circuit Performance – 2000A breaking @ 750VDC / 1500A @ 1000VDC, 8000A tolerance @ 5ms
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Overload Endurance –
– 450A for 900s
– 600A for 120s
– 900A for 30s
– 1000A for 25s -
Fast Switching – Operate ≤30ms, Release ≤10ms, Bounce ≤5ms
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RoHS Compliant – Environmentally friendly
Typical Applications
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EV battery disconnects (BDU)
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High-voltage traction inverter switching
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Pre-charge and discharge loop control
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DC link and powertrain protection circuits
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Energy storage switching in EV/HEV systems
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Model | BSBC8V-300C |
| Rated Current | 300A (≥100 mm² wire) |
| Rated Voltage | 12–1000VDC |
| Max Breaking Current | 2000A @ 750VDC / 1500A @ 1000VDC (1 op) |
| Electrical Life | 140A @ 20VDC: 75,000 ops 300A @ 750VDC: 500 ops 300A @ 1000VDC: 200 ops |
| Mechanical Life | 200,000 operations |
| Coil Voltage | 12VDC / 24VDC (single coil) |
| Coil Resistance | 24Ω (12V) / 96Ω (24V) |
| Power Consumption | Approx. 6W |
| Operate / Release Time | ≤30ms / ≤10ms |
| Bounce Time | ≤5ms |
| Insulation Resistance | ≥1000 MΩ @ 1000VDC |
| Dielectric Strength | 3000VAC between contacts and coil |
| Vibration / Shock | 49 m/s² (vibration), 588 m/s² (shock) |
| Operating Temp | -40°C to +85°C |
| Mounting Orientation | Vertical |
| Weight | Approx. 360g ±15g |
Dimensional Drawing & Wiring Diagram
Connector Horizontal Lead-Out Type
Connector Vertical Lead-Out Type
FAQs About The BSBC8V-300A High Voltage DC Contactor
Q1: Is the BSBC8V-300C suitable for 1000VDC operation?
A1: Yes, it is rated for continuous operation at up to 1000VDC and can safely break 300A under this voltage up to 200 times.
Q2: Does this contactor support EV pre-charge and battery disconnect?
A2: Absolutely. The BSBC8V-300C is widely used in BDUs and pre-charge systems for EVs and hybrids.
Q3: Can this contactor handle short circuit conditions?
A3: Yes, it withstands 8000A for 5ms without fire or explosion.
Precautions for Use
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Mounting: Use flat and spring washers. Torque for M6 terminals: 6–8 N·m; M5 body mount: 3–4 N·m
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Inductive Load Protection: Install surge absorbers like TVS diodes or varistors in parallel
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Capacitive Loads: Use pre-charge circuit; keep closing voltage difference ≤20V
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Coil Protection: Do not use a diode. Use TVS to avoid delayed release
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Avoid: High magnetic fields, heat sources, grease contamination, direct impact
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Operating Temp: -40°C to +85°C; avoid dew/ice internally
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Storage: 12 months, avoid corrosive gases or direct sunlight