Siemens 3VA1 MCCBs The new 3VA1 molded case circuit breakers reliably perform all the tasks associated with line protection. The devices of the 3VA1 series fulfill all standard tasks in line protection, thanks to their particularly compact design, 3VA1 MCCBs are the perfect choice for applications in distribution boards and machine engineering. They are easily mounted as fixed or plug-in versions. The basic trigger for overload or short-circuit protection is a thermal-magnetic, electronic trip unit (TMTU) and is suitable for use in three-phase, AC, and DC networks. Compact design Thermal-magnetic trip units AC/DC applications No derating up to +50 °C Siemens 3VA MCCBs and accessories