Siemens 5SX23C4 Three-Phase Molded Case Circuit Breaker

Siemens 5SX23C4 is a three‑pole molded‑case circuit breaker (MCCB) from the 5SX2 family, configured for 400 V AC service with a nominal current rating of 4 A. It delivers a short‑circuit breaking capacity of 6 kA at 400 V, making it suitable for protecting small to mid‑size three‑phase loads in compact low‑voltage panels. The model designation 5SX23C4 identifies a 3‑pole device in this series with a C4 rating, and the MCCB can be paired with the 5SX9100‑HS auxiliary contact block to add signaling (DPDT: 1 NO + 1 NC). The 5SX9100‑HS auxiliary block is rated to operate up to 6 A at 230 VAC/DC, enabling status indication or interlocking in motor control circuits. Typical applications include motor control circuits, machine panels, and general distribution where reliable, space‑efficient three‑phase protection is required.