What this contactor is and where it fits
The Siemens 3RT1026-3XG28-0MV0 is a SIRIUS power contactor in the Size S0 frame, designed for switching motor loads in control panels. It mounts onto a 35 mm DIN rail per DIN EN 50022 with either screw or snap-on fixing, so it drops into a standard panel layout without extra bracketry. Rated for AC-2 duty at 400 V delivering 11 kW, this contactor handles slip-ring motor starting and reversing loads. The AC-4 rating at 400 V is 15.5 A, covering inching and plugging cycles where the contactor makes and breaks stalled-rotor current.
Key ratings and what they mean for your panel
The main power circuit uses screw-type terminals accepting 2x (0.25 to 2.5 mm²) solid or 2x (1 to 2.5 mm²) stranded, with a maximum of 2x 10 mm² — enough for the 35 A gL/gG fuse required for Type 2 coordination. That coordination rating means the contactor clears a short-circuit fault without welding its main contacts, so downstream repair is limited to replacing the fuse. Two instantaneous auxiliary contacts are built in, rated 10 A at 24 V and derating to 0.3 A at 220 V. The integrated RC surge suppressor across the coil saves an external module and reduces EMI on the control wiring. Operating temperature range is -25 to +60 °C with pollution degree 3, so it's suited for industrial environments where conductive dust or humidity is present. The front face is IP20 (finger-safe), but the terminal area is IP00 — keep live parts behind a panel door or cover.
Mounting and wiring notes
The contactor occupies 45 mm width on the DIN rail, with a depth of 140 mm and height of 88 mm. Side-by-side mounting is allowed without derating, so you can gang multiple units in a row to save rail space. Altitude limit is 2 000 m — above that, dielectric strength and cooling drop, so factor derating for high-altitude installations. Coil operating range at 50 Hz is 0.8 to 1.1 times rated voltage, and at 60 Hz it's 0.85 to 1.1 times, giving a solid pickup margin even with line sag.
Lifecycle and sourcing posture
The 3RT1026-3XG28-0MV0 is sourced to order against an RFQ. The integrated RC suppressor and the 2-aux-contact configuration may differ from base variants, so confirm the aux contact count and coil suppression match your control scheme before committing the line.