I took my bad voltage limiter apart... here is what I found

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Posted by Mark [] on Wednesday, March 25, 2020 at 16:16:26 :

In Reply to: Re: How to bench test the voltage limiter posted by Mark [] on Wednesday, March 25, 2020 at 15:01:18 :

so to answer my own questions...

1. Yes, the body of the limiter has to be grounded so the heating coil draws a current to heat the bimetallic strip.

2. No, there doesn't need to be a load. The output voltage is regulated by a bimetallic strip that heats and cools cycling the output on and off causing a chopped DC output that averages somewhere around 5V.

My disassembled voltage limiter had a burned up heating coil causing the points to remain closed all the time and thus passing 12V continuously to the output terminal. I read somewhere that these guages are rated for 6V.


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