What this SIRIUS S0 contactor does in a panel
The 42 VDC coil pulls in at 5.4 W and holds at the same 5.4 W — no power drop after pick-up, so the DC supply needs to sustain that continuously. Rated for AC-4 duty at 12.5 A on 400 V, meaning it handles reversing or inching (plugging) of squirrel-cage motors at that current, which is the punishing switching condition. The AC-12 rating of 10 A covers control-circuit loads like PLC outputs or relay coils. Side-by-side mounting is allowed with zero side clearance — the 45 mm width per pole stacks tight.
The mechanical life is 10 million switching cycles. Two instantaneous auxiliary contacts are built in (no separate aux block needed for basic signaling).