Siemens 5SX23038 3-Pole Miniature Circuit Breaker

Siemens 5SX23038 is a three-pole DIN-rail miniature circuit breaker designed for 400 V AC three‑phase distribution. It carries a nominal current rating of 3 A per pole and uses a Type D magnetic trip characteristic, providing fast protection against short circuits while allowing normal operation up to its rated current. This unit is part of Siemens’ 5SX family and is intended for easy integration into standard control panels and distribution boards with a DIN-rail mounting footprint. The compact three‑pole design protects all three phases of a three‑phase circuit, making it suitable for 400 V mains in industrial and commercial installations that require reliable phase protection for three‑phase loads. In typical panel wiring, it serves as upstream protection for a branch circuit, interrupting current during overloads or faults and enabling safe, predictable shutdown of affected equipment. Installation follows standard DIN-rail practices, with all three phases connected to the corresponding poles and adequate spacing to manage heat dissipation.