General Electric TEY140 NN Thermal Magnetic Circuit Breaker

General Electric TEY140 NN Thermal Magnetic Circuit Breaker is a 40A, 277V, 1-pole protective device designed to interrupt fault currents in electrical distribution by disconnecting the affected path, thereby protecting downstream wiring, devices, and panel components from damage. Its thermal-magnetic trip mechanism combines a bimetallic element that provides a time-delayed response to moderate overloads with a magnetic core that activates instantly on high fault currents, delivering both selectivity and rapid fault clearance. The TEY140 NN specifies an AIC rating of 14AIC, representing its interrupting capacity for fault conditions, and it is identified by the TEY140 NN model as part of GE's TEY-series thermal magnetic breakers. Designed for use in 277V AC circuits and 1-pole configurations, this GE breaker is intended for installation in compatible GE panels and distribution systems that specify TEY-type protection.