Square D 3104140042 Thermal Magnetic Circuit Breaker

The Square D 3104140042 Thermal Magnetic Circuit Breaker is a protective device that interrupts electrical current to prevent damage from overloads and short circuits. As a thermal magnetic breaker, it combines a bimetallic thermal element that trips on sustained overcurrent with a magnetic mechanism that activates during high fault currents, providing both delayed and instantaneous protection. This model is part of the Square D lineup from Schneider Electric and is used in electrical distribution systems to safeguard branch circuits and connected equipment. The 3104140042 designation identifies the specific device in the Square D catalog, supporting accurate ordering and compatibility within standard panel installations. Thermal magnetic breakers like this are favored for reliable overcurrent protection in environments that require fast response to short circuits while reducing nuisance trips through the thermal trip mechanism.