Test path vs power path
Use reed relays for high-voltage measurement and test routing; use DC contactors where the circuit carries traction, charging or storage current.
Application: EV / ESS / PV
EV & New Energy Switching Components
EV, charging and energy-storage systems use different switching technologies for different paths: HV reed relays for test and sensing channels, and HV DC contactors for high-current power isolation.
BMS testInsulation monitoringDC contactorsCharging & storage
What this component is used for
Precharge and protection
Power systems typically need precharge sequencing, fuse coordination and contactor feedback to reduce inrush and improve safety.
Validation equipment
Battery pack testers, charger testers and PV/ESS production lines need reliable switching components for repeatable automated testing.
Application details
Battery pack and BMS test
Route voltage, insulation, sense and diagnostic channels during module and pack validation.
EV charger and inverter test
Switch measurement paths and isolate DC bus sections during production and service test.
Energy storage systems
Control battery rack isolation, PCS connection and safety disconnect functions.
Photovoltaic and DC power equipment
Support high-voltage test and isolation paths in PV inverter and DC distribution equipment.
Selection factors engineers should confirm
- Nominal and maximum DC bus voltage, continuous current and fault strategy.
- Precharge timing, resistor value and main contactor close condition.
- Insulation monitoring and leakage measurement requirements.
- Thermal environment, enclosure, altitude and vibration.
- Regulatory and system-level safety validation requirements.
Engineering note: Do not substitute a reed relay for a DC contactor in a power path. The website now clearly separates signal/test switching from high-current DC power switching.
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