Current Relay Circuit
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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.
Current relay circuit. A relay is a device by which electric current flowing in one circuit can open or close a second circuit i e. Medium current relays these relays are rated for motors with 1 3 horsepower or 15 90 amps use them with industrial automation systems security and emergency lighting and small motors. In the overcurrent relays the current is set by the adjusting screw on the relay. Switch the current on or off in the second circuit.
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. Notice here that breaker tripping coil is solely responsible for the tripping of circuit breaker. The overcurrent relays are connected in series to the load circuit and the load current is passed through. When a pump is operated with a flooded suction and liquid completely covers its inlet the pump s motor will draw normal operating current.
Split core current sensor relays can help monitor the current of circuits to help in detecting locked rotors current loss open heaters or lamp loads. Internal core current sensor relays internal core current sensor relays are designed to help monitor the current flow in a conductor. The current sensing relay in this water pump electrical circuit prevents the pump from running when the water level is too low. They activate at a fixed or adjustable current setting point.
Working of the electromagnetic relay. If trip coil of breaker fails then tripping of breaker will not take place.
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