Permanent Magnet Relay or PMR is a vital component in the ELCB & RCCB. It actuates & trips the circuit breaker on detection of leakage current in the mains. This relay is different than normal relays in a way that it has built in Permanent Magnet. The Rig measures the following parameters of the PMR, The system is PC based & all the cycle data is stored in the database on PC.