DC leakage current sensor

DC leakage current sensors are essential safety devices in EVs and charging stations. In high-voltage battery packs and DC charging systems, any insulation failure can pose a risk of electric shock or fire.

These sensors continuously monitor small DC leakage currents on the protective earth (PE) line—typically in the milliampere or microampere range—and immediately trigger an alarm or protective shutdown if the current exceeds safe limits, enabling real-time diagnostics and prevention of insulation faults.

In solar power plants, DC leakage current sensors are critical for system safety and equipment longevity. PV arrays can develop DC leakage currents to ground due to moisture, environmental contamination, or module aging.

These currents can cause fire hazards, electric shock, and accelerate potential-induced degradation (PID) of modules. The sensors isolate and monitor ground fault currents, enabling inverters to quickly disconnect faulty circuits, protecting equipment and extending the lifespan of PV modules.

As high-voltage DC (HVDC) power becomes common in large data centers and industrial applications, monitoring DC leakage currents is increasingly critical. In these environments, where continuous power supply is essential, sensors continuously monitor the insulation status of the DC bus to ground.

By detecting small insulation leaks early and with high sensitivity, maintenance teams can intervene before faults escalate, preventing downtime or equipment damage and ensuring high system reliability and personnel safety.