Switch disconnector in MCCB form factor — 125 A continuous, no trip curve
The SENTRON 3VA1112-1AA42-0DC0 is a 4-pole switch disconnector built in an MCCB-style housing (IEC frame 160). This is a pure disconnecting device: it provides no overload or short-circuit protection, so it is intended for isolation and safety disconnection where the upstream protection is handled by a separate circuit breaker or fuse.
Built-in undervoltage release and auxiliary switches
This variant ships with an undervoltage release (UVR) factory-installed, rated for 208–230 V AC 50/60 Hz, and two high-quality auxiliary switches (2 CO contacts). The UVR ensures the disconnector trips automatically if control voltage drops, which is a common requirement for safety circuits and motor feeder isolation. The front terminal arrangement and busbar connection pattern match the standard 3VA MCCB footprint, so it can be panel-integrated alongside other 3VA breakers without rework.
The main circuit connects via busbar from the front terminals; the UVR and auxiliary switches terminate with standard screw or cage-clamp connections. An optional motor drive can be added for remote operation.