The Siemens SENTRON 3VA1112-1AA36-0HH0 is a 3-pole switch disconnector in an MCCB-style housing, rated for 125 A continuous at 40 °C through 70 °C ambient — no derating needed across that span. It operates at 690 V AC or 500 V DC, with an 800 V rated insulation voltage. The unit includes a shunt trip release (STL) for 12-30 V DC or 24 V AC, plus two auxiliary switches and one trip alarm switch, all HQ type. Front terminal connections keep wiring accessible in a panel.
The 3VA1 frame measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. IP40 on the front face means it is protected against tools and small wires entering the enclosure, suitable for general-purpose industrial panels. The 38 W maximum power loss at full load should be factored into enclosure thermal calculations.
Mechanical service life is rated at 15,000 operating cycles typical — adequate for frequent switching in distribution or machine disconnect applications. The shunt trip release allows remote emergency-off or interlock tripping without an undervoltage release. No communication function is built in; this is a pure disconnect and isolation device.