Siemens 5SN9110-0KA30 Single Pole Circuit Breaker With Auxiliary Contact

Siemens 5SN9110-0KA30 is a compact single-pole circuit breaker with an integrated auxiliary contact and a 10 A rating. It protects a single conductor in low-voltage circuits by interrupting fault current to prevent damage to wiring and equipment, while the auxiliary contact provides a signaling path to control systems or safety interlocks for real-time status feedback. This configuration is commonly used in industrial control panels and small distribution layouts where both protection and remote status indication are required in a single device. With its compact form and built-in signaling capability, the 5SN9110-0KA30 enables straightforward wiring schemes for PLCs and machine controls, helping operators verify that protection is engaged without having to inspect the main power path.