Square D Q1240 Molded Case Circuit Breaker 40 Amp

Square D Q1240 molded case circuit breaker provides 40-amp overcurrent protection for 120/240 VAC circuits. As a molded case device, it interrupts current to protect wiring and connected equipment from overloads and short circuits within electrical distribution systems. The Q1240 designation identifies a 40 A unit in the Square D line, suitable for installations requiring a 40-amp rating on standard 120/240 VAC service. This model is designed for use in electrical panels and distribution boards that accommodate molded case breakers, delivering reliable protection for circuits and connected devices. By disconnecting power during fault conditions, it helps prevent conductor overheating and potential equipment damage in the protected circuit. Common applications involve protecting branch circuits or feeders in electrical panels where a 40-amp rating and 120/240 VAC operation are required.