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What is the current rating on the contacts of a 9037 switch?

The 9037 devices are not current rated, but are horsepower rated. The motor horsepower ratings vary with single or three phase as well as voltage.
They do, however have a Nema A600 control circuit rating, which is used where direct motor control is provided by a contactor or starter. In this type of application, the 9037 device opens and closes to energize and deenergize the coil of the contactor or starter.
See Digest 173, p 20-26.

CTA-ID : 2025993
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