Siemens 42BF25AF 4P Molded Case Circuit Breaker

Siemens 42BF25AF is a 4P molded-case circuit breaker designed for industrial electrical distribution and protection. It mounts in panels, motor control centers, and switchgear assemblies to provide overcurrent protection for circuits and motors in manufacturing plants, commercial facilities, and automation systems. Key specifications include a 30 A frame rating, 480 V AC operating voltage, and an interrupt rating of 40 kA, with NSFB (non-switching fuse breaker) trip characteristics. The device is IEC/UL certified and intended for panel-mount installation in environments ranging from -20°C to +60°C, with approximate dimensions of 140 × 70 × 85 mm. Common replacements include Siemens 42BF25AA, Square D HFD34040, and Eaton BL34040.