The GT63L18A is a bimetal-style overload relay designed to protect AC circuits and motors against overloads, phase failure, long starting times, and prolonged stalling. As a Class 10 differential relay with lug terminals, it features a 3-pole, 3-bimetal heater design and an adjustable current setting range of 12-18A. It operates at a rated voltage of up to 690V, includes 1NO+1NC auxiliary contacts, and offers functions like trip indication, test, and selectable manual/automatic reset. This 65AF frame size relay is suitable for use with CC50 and CC65 contactors, providing reliable motor protection in various industrial applications.