These relays help in current flowing within the electronics isolated circuit ensuring the protection from overload. These relays are built-in digitally indicating the power supply. Built in Trip status indicator and power on indicator. To perform the experiments the necessary patch chords and terminals are required for the relay. Built in time interval meter Stop/ Start timer (Digital). Current limiter and auto transfer are the continuous variables for the safety of phantom fault.  Through M.C.B power on/off system is in built to control relay testing. Digital AC ammeter and AC voltmeter. Under/Over Voltage Relay.