Product Introduction
The BSBC8V-350C is a high-reliability 350A DC contactor for EV systems, engineered to meet the demands of high-voltage 1000VDC electric vehicle power circuits. With its ceramic-sealed construction and gas-filled arc suppression chamber, it offers safe, arc-free switching and excellent thermal and mechanical endurance. This contactor is suitable for use in EV battery disconnects (BDUs), motor drive circuits, pre-charge systems, and inverter interfaces.
Product Features
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350A Continuous Current at 1000VDC – Supports high power switching in electric vehicles.
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Ceramic Gas-Sealed Structure – Provides enhanced arc suppression, insulation, and environmental protection.
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Short Circuit Rated – Can withstand 8000A @ 5ms without fire or explosion.
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Overload Performance –
– 400A for 480s
– 600A for 120s
– 1000A for 25s -
Fast Response – Operate time ≤30ms, release time ≤10ms, bounce ≤5ms.
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Auxiliary Contact – Optional (this version: none).
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Compact Build – Approx. 360g, ideal for tight EV enclosures.
Typical Applications
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EV battery disconnect units (BDU)
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Pre-charge and discharge switching
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Inverter-side high voltage switching
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Traction motor power isolation
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EV fast-charging protection
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Model | BSBC8V-350C |
| Rated Current | 350A (≥110 mm² cable) |
| Rated Voltage | 12–1000VDC |
| Max Breaking Current | 1500A @ 1000VDC (1 op) |
| Electrical Life | 140A @ 20VDC: 75,000 ops 350A @ 1000VDC: 100 ops |
| Mechanical Life | 200,000 ops |
| Coil Voltage Options | 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 |
| Short-Circuit Rating | 8000A @ 5ms (no explosion or fire) |
| Vibration / Shock | 49 m/s² vibration, 196/588 m/s² shock |
| Operating Temp Range | -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-350A High Voltage DC Contactor
Q1: Can the BSBC8V-350C be used continuously at 1000VDC?
A1: Yes, it is rated for continuous operation up to 1000VDC with a maximum load of 350A.
Q2: Does this contactor include an auxiliary contact?
A2: The standard BSBC8V-350C does not include auxiliary contacts, but versions with auxiliary contact may be available upon request.
Q3: What is the short-circuit withstand capability?
A3: The BSBC8V-350C can tolerate 8000A for 5ms without any fire or explosion risk.
Precautions for Use
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Mounting Torque:
– M6 load terminals: 6–8 N·m
– M5 body mounting: 3–4 N·m -
Use surge suppression (TVS or varistors) for inductive loads.
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Pre-charge is required for capacitive loads; closing voltage differential should be ≤20V.
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Do not use diodes for coil protection; use TVS/varistor to maintain fast release performance.
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Do not exceed -40°C ~ +85°C operating temperature to avoid gas leakage or degradation.
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Avoid magnetic fields, grease on terminals, and heat sources during installation.
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Do not reuse contactors that have been dropped or impacted.
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Storage: ≤12 months in original packaging, away from corrosive gases or sunlight.