Intent of Use: This is a safety device that limits the current flowing in an electric circuit. When the current in the circuit increases beyond the limit, the safety device saves different electrical appliances. This will be used to protect appliances and machines. For Supplemental Protection of Small Motors and Transformers. Product Description: FRN-R-10 is a circuit protection device. These series protective devices supplement the primary branch-circuit breaker to provide backup overcurrent protection. These electrical safety devices also can limit currents with reliability, opening within seconds of being exposed. They are suitable for control circuits and instrument protection in dry (exhibiting little to no humidity) locations.