Defective. I have a van with limited space for a switch. The main switch is a 30 amp pole. Alternating current with 20 amperes is connected to the machine. I've had hell with RV air conditioners and refrigeration. I bought five air conditioners before I got one that cooled. The RV is in use and someone installed a 20/20 circuit breaker which kept cutting the 20 amp main pole. No wonder it should have been 30/20. This 30/20 switch I bought apparently got hot on the 30 amp side and cut off the 20 amp side which was the AC part which I ended up cooling down. After struggling with the air conditioner for a month and one worked, the switch is now faulty and won't stay on due to the switch. I bought a 30 amp circuit breaker and a 20 amp circuit breaker and eventually it all worked out.
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