Siemens J-3125 Molded Case Circuit Breaker 3 Phase

Siemens FXD63B125 molded‑case circuit breaker is a three‑pole protective device rated for 125 A at up to 600 V AC. It uses a thermal‑magnetic trip mechanism to provide both overload protection and instantaneous fault protection, helping prevent damage to downstream circuits in three‑phase electrical systems. The unit carries a 22 kA interrupting rating, enabling it to clear substantial fault currents safely in installations that require reliable short‑circuit clearance. As part of the FXD63B125 family from Siemens, this MCCB combines compact, rugged construction with proven interruption performance for use in low‑voltage distribution panels and three‑phase load protections where dependable protection for 3‑phase loads is required.