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What is the difference between AD and battery module.

External 24V DC power-supply(AD)module>> This is used in case the breaker is tripped or supply to the breaker is withdrawn , then  by connecting through the AD module it is possible to display currents of less than 20% of In with Micrologic A.
With Micrologic P and H , AD module can be used to display fault currents after tripping.
Battery module>>if there is no other  external supply source available in the plant and still we want the display on Micrologic, then we can use this battery module , with run-time 12 hours(approx.)
We cannot use it in loop, there is one dedicated unit for each breaker.

 
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