The circuit breaker is the automatic fuse for short circuit protection. Main circuit breaker SHU, 3x1-pole, E35A, 230400V for mounting on 40mm busbars. The circuit breakers from Siemens are an important component of the SENTRON protection devices for electrical installations and provide effective protection for people and systems through safe disconnection in overload and short circuit situations. Convenient mounting and connection technology, uniform additional components, and a consistent design are the hallmarks of this device family. Whether for infrastructure or industrial applications, Siemens offers circuit breakers for all uses and every field of application. Siemens circuit breakers are particularly characterized by: 1. Effective protection for people, investments, and systems against overload and short circuits. 2. Reliable safety during installation thanks to standard included gripping and touch protection. 3. Clear visible switching position indication. 4. Optimal technology for your safety, exclusively from Siemens. Siemens provides a comprehensive portfolio of protection, switching, measuring, and monitoring devices, installation distributors, as well as switches and sockets for a safe and efficient electrical infrastructure in buildings and industry.