Electrical reset auxiliary element relay Lockout MD1501-571 requires a voltage to be applied to the element to reset the contacts. It may be used for various applications as repeat relay, control relay or signal selection etc. subject to the requirement of applications. The high burden provides greater immunity to capacitance discharge currents resulted at the inception of an earth fault on DC circuitry. This makes the relay suitable for use in distributed tripping or control circuitry where the initiating contact may be remote from the

relay.

 

Electrical reset auxiliary element relay Lockout MD1501-571 operating coil supervision circuit is composed of optocoupler and reply,it continuously monitors relay coils and releases alarm via signal contact n17 and n18 under abnormal situations, such as coil open-circuited, loss of DC power supply etc. If the relay coil circuitry is healthy, the LED indicator L1 is lit (Green). After the relay is operated, the indicator L2 is kept via contact K2-2.

 

 

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