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What is a WH or "water heater" breaker?

Issue:
What is a water heater QO breaker?

Product Line:
Miniature Circuit Breakers

Resolution:
It was a special QO type breaker for applications where a separate meter was supplied for a water heater. The breaker did not connect to the bus, but had two pigtails which connected to the meter, and two terminals for connection to the water heater. See pictures below:
Pic1 of water heater breaker
Pic2 of water heater breaker

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