Siemens 5SY4118-7 Industrial Miniature Circuit Breaker

Siemens 5SY4118-7 is a single‑pole supplementary protector rated for 15 A on 230/400 V AC, featuring a C‑curve trip characteristic for reliable overload protection in general‑purpose circuits. This 1P device interrupts fault currents up to 10 kA and has a depth of 70 mm, aligning with standard enclosure layouts in industrial control panels. As part of the Siemens 5SY4 family, it is designed to protect a single conductor or branch circuit in low‑ to medium‑energy installations, such as lighting runs, control circuits, or small‑motor loads where predictable trip behavior is important. The 5SY4118-7 is specified for 230/400 VAC operation, making it suitable for 50/60 Hz electrical systems found in commercial and light industrial environments. The unit’s compact form and 15 A rating support straightforward replacement and maintenance within multi‑device protection schemes, and it is compatible with other Siemens SENTRON components that follow the same 5SY4 platform. In service, it provides disconnection under overload conditions, helping to prevent damage to downstream equipment and contributing to safer, more reliable distribution of power within panels and enclosures.