QLM safety relay & its trouble shooting..

In this video you will learn about QLM relay and trouble shooting of QLM relay dropping

Three Phase Electric Locomotive :
Total knowledge of VCD in Three phase...

Conventional Locomotive :
DJ Control circuit... by Vijay srivas...

For railway departmental  exam related videos refer to the following playlist :-
Exam related

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• #act_of_qlm_relay_drop