<p style="text-align:justify"><span style="font-size:14px">Logic gate functions such as AND, OR, NOR, NAND are in-built in the relay architecture. The interlocking between C. B., isolators and earthing switch can be configured in the relay programing and no separate interlocking mechanism (electrical or mechanical) is required. </span></p>

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<p style="text-align:justify"><span style="font-size:14px">Relay consists of different soft blocks like three phase overcurrent, overvoltage, undervoltage, circuit breaker failure function etc. The inputs to these blocks are three line currents, three line voltages, block input etc. The outputs are usually start and operate outputs. If an overcurrent relay is required to be monitored by an undervoltage unit, operate outputs of overcurrent unit and an undervoltage unit are routed to an AND logic function block, the output of which is soft-connected to a final output relay.</span></p>