The Siemens SIRIUS 3RT1276-6AP36-ZI41 is a vacuum contactor rated for 250 kW at 400 V in AC-3 duty — the standard motor-switching category per IEC 60947-4-1 — meaning it handles the inrush and breaking of squirrel-cage motors up to that load. The AC/DC coil accepts 220-240 V control voltage, and the built-in auxiliary contacts are 2NO+2NC, enough for a feedback signal to the PLC and a holding circuit without an add-on block.
Clearance and mounting
Those are the spacing requirements for heat dissipation and arc quenching — pack them tighter and you risk nuisance tripping or accelerated contact wear. Side-by-side mounting is permitted, so multiple units can share a DIN-rail or screw-fixing row as long as the forward clearance is respected.
What it is not
This contactor is not safety-rated for switching off — it lacks the mirror-contact or mechanically linked features required for safety circuits per IEC 60947-4-1. It also carries no communication module; it is a standalone power switching device, not a fieldbus slice.