The 5SY4403-8 by Siemens is a four-pole, Din-mount circuit breaker rated for 230/400VAC with an interrupting capacity of 3A (Inom). It has a short-circuit protection character of D. The breaker features quick-breaking action and has an integrated manual actuation for protection during emergencies. The product meets UL, IEC, and EN standards and is capable of carrying up to 9A. It can be used in electric industry, control systems, home appliances, and other equipment and has a number of features for higher safety requirements, such as thermomagnetic operation, optional under-voltage protection, manual power interruption, and optional residual current protection.