SIRIUS S0 power contactor, 110 VDC coil
It's rated for 7.5 kW motor switching at 400 V AC-3 duty, which covers the common 400 V three-phase induction motor range up to that power. The DC coil pulls 5.4 W on closing and holds at 5.4 W — no economizer circuit needed, but verify your DC supply can deliver the inrush without droop.
That's the number that governs real motor duty. The AC-4 rating of 15.5 A at 400 V covers plugging and inching, which is harder on the contacts; if your application does frequent reversing or jogging, size on the AC-4 figure, not AC-3. This matters for selectivity studies — if you're protecting downstream devices, the 25 A limit constrains your fuse choice. That's standard for unsealed panels in factory floors, not for clean rooms or sealed enclosures without condensation management. The IP20 front / IP00 terminal rating means the front of the contactor is finger-safe, but the terminals are exposed — they need to be inside a panel or guarded. Not a standalone device for open mounting.
Wiring and terminal details
Main circuit terminals are screw-type, accepting solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), 1x 8. That covers most panel wiring up to 4 mm² solid or 10 mm² stranded — enough for the 25 A fuse coordination path.