Parallel trigger fuses used as a blown fuse indicator.

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Monks

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Power and controls Engineering tech
Yesterday I had a question that I was unable to unable to answer around the application of trigger indicators. In this case it is the Shawmut Trigger. Question: "How. During normal operation, does the trigger fuse function without blowing?" My thought was an impedance increase must be present to keep current through the primary fuse path but no resistors are present and the trigger has a .6 ohm when read with a fluke. I cant find allot of detail on the TI-600 operation. However, I did see in one of the cut sheets that it was not a fuse. This application is on a Siemens Allis 1600LAF with Ferraz Shawmut A4BY as a primary fuse and the parallel trigger is a Shawmut trigger TI-600. Any help on this is greatly appreciated
Thanks
 
A 4-wire ohmmeter is necessary for accurately measuring low resistances.

But assuming that the 600 mΩ measurement is close, a minimum of 3 volts would be required to push the 5 amps fusing current. And if there's 3 volts drop across the main fuse, something's wrong.
 
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