Siemens 5SJ4340-7HG42 Circuit Breaker

Siemens 5SJ4340-7HG42 is a 3-pole molded-case circuit breaker from the 5SJ4 family, designed to protect electrical circuits in commercial and light industrial panels with a 40 A current rating and a curve C trip characteristic. It carries a 10 kA interrupting rating and is listed to UL 489, providing reliable short-circuit protection for three-phase distribution. The 5SJ4340-7HG42 configuration ensures simultaneous interruption on all three phases, making it suitable for protecting general-power or motor-load circuits in Siemens panel systems and other equipment designed for 5SJ4 devices. This model's exact designation differentiates it within the Siemens 5SJ4 lineup, offering a precise 40 A, curve C, 3P protection option for dependable electrical protection in compliant installations.