PRODUCT DESCRIPTIONFor switching and tripping wiring, use the Murray 20 Amp Single-Pole Circuit Breaker to provide protection from high temperatures caused by higher-than-rated electrical currents. This circuit breaker offers an easy-to-install plug-in design and is compatible with copper and aluminum wiring. This type MP-T breaker has a 10k AIR rating. Thermal-magnetic design for overload and short-circuit protection of an electrical system Switches and protects your home"s wiring from high temperatures caused by higher-than-rated currents 20 Amp , 120/240 VAC, 10,000 AIR rated Meets UL, CSA and ANSI safety requirements MFG Brand Name : Murray MFG Model # : MP120U MFG Part # : MP120U