Power-path switching
Unlike reed relays, HV DC contactors are designed for high-current DC power circuits, isolation and controlled connection/disconnection.
HV DC Contactor
High Voltage DC Contactors for EV, ESS and Industrial DC Systems
MiRelay HV DC contactors are used for high-voltage DC power switching and isolation in battery packs, charging systems, energy storage, photovoltaic equipment and industrial DC buses.
EV battery packsEnergy storage systemsDC fast chargingMain / precharge contactors
What this component is used for
Precharge coordination
In EV and ESS systems, precharge contactors and resistors limit inrush current before main contactors close.
Safety feedback
Auxiliary contacts, coil control and system interlocks help the controller confirm contactor state in safety-critical systems.
Application details
EV and HEV battery packs
Main positive, main negative and precharge positions connect the battery pack to inverter, charger and DC bus circuits.
Energy storage and solar systems
Used in battery racks, PCS equipment, PV inverters and DC distribution where reliable isolation is required.
Charging infrastructure
Switch high-voltage DC outputs and protect service operations in charging piles and DC fast-charger systems.
Industrial DC buses
Provide isolation and emergency disconnect capability for UPS, motor drives and test benches.
Selection factors engineers should confirm
- Specify rated voltage, continuous current and making/breaking current under the real DC load.
- Confirm load type: resistive, capacitive, inductive, motor, inverter or fault condition.
- Review precharge sequence, coil economizer/PWM drive and auxiliary contact logic.
- Confirm short-circuit coordination with fuses and BMS protection strategy.
- Check temperature rise, mounting direction, terminal torque and enclosure requirements.
Engineering note: DC interruption is load-dependent and more demanding than AC. Always specify the real circuit, not only nominal voltage and current.
Need help selecting a relay or contactor?
Send voltage, current, load type, coil voltage, package constraints and target application. MiRelay can recommend a standard series or custom design path.