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I have not yet mounted it, however, it should be mointed to some metal surface like a cab wall or floor or other bulkhead etc. so that it can dissipate any heat. It is not likely to do so for normal operation, but in case the voltage should rise above the Zener diode's threshold, it could become...

Please send the -24's! might have more info about the parts.

It's very interesting. Thanks! Looks like a very big 33V Zener diode, a thermal switch that closes when the chassis reaches a certain temperature, and an electronic temperature sensor that closes when the Zener diode reaches a certain temperature. There is a large 2-pole circuit breaker. The...