A critical safety device dedicated to detecting low-level leakage currents flowing to earth, which are not sufficient to trip standard overcurrent breakers but pose a serious risk of electric shock or fire.

A protective device designed to monitor system voltage levels and trigger an action if they deviate from a preset safe range. It measures voltage and will operate to trip a connected circuit breaker or contactor if it detects potential damaging conditions such as overvoltage or undervoltage.

Monitoring circuits in environments like excessive current and insulation failures to earth. Upon detecting a fault, the relay instantly sends a trip signal to a circuit breaker, isolating the faulty section to prevent equipment damage and ensure safety.