Supplemental vs Branch Circuit Protection requires different UL certifications and you should pay close attention to this when you design a control circuit. Supplemental circuit protection is a term used when defining that the load will not be operated by the device and that there is one other level of protection between the device and the load - the device should carry a UL certification of UL1077 or greater. Branch Circuit Protection means that the device can operate the load directly with no other level of protection between the breaker and the load, having a UL certification of UL489.
American Electrical has a complete line of UL 1077 and UL 489 circuit breakers for any of your design requirements. Thanks for reviewing!
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