The Siemens 3RT1016-1BB41-ZX95 is a SIRIUS power contactor in size S00, designed for switching motor loads in control panels. The 24 VDC coil draws 3.3 W for both closing and holding, so the control transformer or DC supply needs to deliver that continuously — no inrush spike to size for, but the steady-state draw is constant. Rated for 4 kW at 400 V AC-3 duty (standard motor switching), it handles the common 4-pole induction motor up to that power. The AC-4 rating of 8.5 A at 400 V covers reversing or inching applications where the contactor makes and breaks stalled-rotor current — a useful headroom check if the load cycles frequently under load.
Mounting and integration
Snap-on mounting onto 35 mm DIN rail per EN 50022, with screw terminals for both main and auxiliary circuits. The 45 mm width and 57.5 mm height fit the standard S00 footprint; depth is 72 mm, which matters when the panel depth is tight against a backplate or door. Side-by-side mounting is permitted, with 6 mm spacing at the side — no forced air gap, but the 20 A gL/gG fuse (type 2 coordination) or 35 A (type 1) sets the short-circuit protection upstream. Screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid or stranded — covers the common panel wire sizes without needing ferrules for the smaller gauges. IP20 on the front and terminals means it's protected against finger contact but not washdown; keep it inside a closed enclosure.