© Siemens AG 2010 BETA Protecting Miniature Circuit Breakers (MCBs) Miniature circuit breakers 1 + N in 1 MW, 5SY6 0 Overview These miniature circuit breakers are used for the protection of plants with switched neutral conductors in distribution boards with little space. They are only a single modular width. The devices are approved for worldwide use according to IEC standards for systems up to 250 V AC. 60 V DC per pole is per- mitted in DC systems according to IEC standards. Compact busbars facilitate installation in space saving distribu- tion boards.
Benefits Auxiliary switches and fault signal contacts from the high- capacity range can be freely mounted on these miniature circuit breakers. This increases availability and cuts down on logistics. For 3-pole busbars, the 5ST3 6 busbar system is used – a uni- versal system, suitable for all miniature circuit breakers. By actuating the latching slide, the miniature circuit breakers can be quickly and easily removed from the assembly. The infeed can be implemented either from the top or the bottom. Additional terminals with lateral insertion of conduc- tors facilitate mounting when using large conductor cross- sections. 19 19/23 Siemens LV 1 · 2010