The Siemens SIRIUS 3RT1026-3XG28-0MV0-ZW96 is a Size S0 power contactor rated for AC-3 duty at 25 A, switching 11 kW at 400 V. The 110 V AC coil operates on 50/60 Hz. Three main poles, spring-type terminals for the main circuit — no screw tightening needed, which speeds panel wiring and reduces torque inspection. The auxiliary contact block includes 1 NO + 1 NC standard contacts plus an additional 1 NO + 1 NC set that is solid-state compatible, meaning it can switch low-level signals from a PLC output without reliability issues. An RC suppression module is attached at the bottom.
What the ratings mean for fit
The AC-3 rating of 25 A / 11 kW at 400 V is the motor-switching figure that governs real-world use — it tells you this contactor handles a 3-phase induction motor load up to that power. The 110 V AC coil means it pulls in from a standard control transformer; verify your control voltage matches. Size S0 is the frame size — 55 mm width, snap-on mounting onto 35 mm DIN rail per EN 50022. The spring-type terminals accept 0.75 to 16 mm² solid or stranded wire; no ferrules required but recommended for stranded. The solid-state compatible auxiliary contacts are rated for 17 V / 1 mA minimum switching — they reliably switch PLC-level signals without the contact wetting issues standard contacts sometimes have at low currents.
Panel integration
Size S0 occupies 55 mm of rail width. Side-by-side mounting is permitted with 6 mm spacing to grounded parts. The spring terminals on the main circuit accept 0.75–16 mm²; the auxiliary terminals accept 0.5–2.5 mm². The RC module is factory-attached at the bottom — no additional assembly needed. The IP20 front-of-terminal rating means it is protected against finger contact but not against dust ingress inside the panel.