Q-Line circuit breaker. Features a dedicated calibration screw which is cemented to prevent shifting. The attached screw creates a stable calibration for optimum performance. Tin-plated copper stab creates a reliable, permanent, and corrosion resistant connection. Case is made of heat resistant thermoset for stability and structural integrity. Box type terminals, trips to center position. Meets NEMA (National Electrical Manufacturer's Association) standards. ANSI (American National Standards Institute) and CSA (Canadian Standards Association) certified.