Current Relay Circuit

Internal core current sensor relays internal core current sensor relays are designed to help monitor the current flow in a conductor.

Current relay circuit.

Also known as power relays. They activate at a fixed or adjustable current setting point. The current sensing relay in this water pump electrical circuit prevents the pump from running when the water level is too low. Under normal condition the current through the relay coil is not sufficient enough to pull the plunger and close the circuit of breaker tripping coil.

The overcurrent relays are connected in series to the load circuit and the load current is passed through. Working of the electromagnetic relay. The current is set within certain limits according to rated currents of the motors. When a pump is operated with a flooded suction and liquid completely covers its inlet the pump s motor will draw normal operating current.

The operating circuit circuit 1 see the figure 1 is connected to a solenoid coil wound round iron core. The overcurrent relays connected to the three phase conductors only control one relay in one phase alternating current circuits and the three phase conductors control the normally closed contact in the control circuit. Notice here that breaker tripping coil is solely responsible for the tripping of circuit breaker. A relay is a device by which electric current flowing in one circuit can open or close a second circuit i e.

If trip coil of breaker fails then tripping of breaker will not take place. In the overcurrent relays the current is set by the adjusting screw on the relay.