Product Introduction
The BSB C7-400A DC contactor is a high-performance, epoxy-sealed DC contactor engineered for continuous 400A operation in electric vehicles (EVs), energy storage systems (ESS), and photovoltaic installations. With 2500A switching capability, high environmental resilience, and flexible coil options, it is ideal for high-voltage DC circuits demanding reliable cut-off and long lifespan. UL and CE certified, the C7-400A ensures robust protection in harsh applications.
Product Features
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Heavy-Duty Switching: Rated for 250A continuous current, and capable of 2500A breaking at 320VDC.
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Low Contact Resistance: Just 0.2 mΩ at 250A, minimizing thermal rise and energy loss.
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Epoxy Resin Sealed: Fully sealed to prevent oxidation and contamination, IP67 rated.
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Wide Coil Compatibility: Supports 12/24VDC and 48/72VDC coil voltage configurations.
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Auxiliary Contact Options: Available with normally open (NO), normally closed (NC), or changeover (Z) auxiliary contacts.
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High Endurance Design: Withstands vibration up to 20G and extreme temperatures from -40°C to +85°C.
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Certified Safety: Compliant with UL, CE, TUV, and RoHS standards for global applications.
Typical Applications
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Main contactor in commercial EV battery systems
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Pre-charge and discharge relay for large BESS and UPS
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High-power DC charging equipment
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PV inverter switching and solar energy control
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Industrial or rail systems requiring vibration-proof HVDC contactors
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Rated Current | 400A |
| Rated Voltage | 12–1000VDC |
| Max Switching Current | 2500A @ 300VDC |
| Main Contact Type | SPST-NO (1SH) |
| Contact Resistance | ≤50mV @ 100A |
| Auxiliary Contact Options | NO / NC / None |
| Coil Voltage | 12/24VDC |
| Operating Voltage Range | 9–36VDC |
| Coil Holding Power | 3.2W (standard) |
| Capacitive Load Life | 600A (RC=1ms), 30,000 cycles |
| Dielectric Strength | AC 3000V |
| Insulation Resistance | ≥1000 MΩ @ 1000VDC |
| Mechanical Life | 300,000 cycles |
| Operating Temperature | -40°C to +85°C |
| Vibration Resistance | 10–2000Hz @ 20G |
| Weight | 550g (555g with auxiliary contact) |
| External Conductor Area | ≥120 mm² |
| IP Rating | IP67 |
Dimensional Drawing & Wiring Diagram
FAQs About The BSBC7-400A DC Contactor
Q1: Does the C7-400A DC contactor have reverse surge protection?
A1: Yes, the C7-400A DC contactor has an integrated surge suppression circuit, so there’s no need to configure a varistor or TVS diode.
Q2: Is this contactor safe for use in chemical or explosive environments?
A2: Absolutely. The epoxy-sealed design eliminates arc exposure and protects internal components from contamination.
Q3: What is the recommended conductor size?
A3: External conductors should be no less than 120 mm² to ensure safe current delivery at 400A.
