Siemens 5SY4-104-7 Four Pole Miniature Circuit Breaker

Siemens 5SY4-104-7 (often cataloged as 5SY4104-7 or 5SY41047) is a SENTRON miniature circuit breaker designed for single‑pole protection in 230/400 V AC circuits. This model is rated at 4 A and uses a C‑type trip characteristic, with a 10 kA interrupting capacity at the rated voltage, and a compact depth of 70 mm. As part of the 5SY4 family, it protects individual single‑phase circuits in distribution boards, making it suitable for lighting and small‑appliance runs in residential and light commercial installations where reliable overcurrent protection is required. The device is widely listed under the 5SY4‑104‑7 designation across major distributors, aligning with European panel standards for DIN‑rail style installations and common 230/400 V systems. With its 4 A rating and 230/400 V operation, this 1‑pole breaker provides clear, predictable tripping behavior for everyday electrical protection needs while maintaining a compact footprint within multi‑branch panels.