The Siemens 3RT2028-1NF30 is a SIRIUS-brand power contactor in the Size S0 frame, designed for switching motor loads and resistive circuits in industrial control panels. It carries a 95-130 V AC coil and uses screw-type terminals for the main and auxiliary connections. The contactor mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, fitting a 45 mm wide slot in the enclosure. The Size S0 frame is a common footprint across the SIRIUS family, so panel layouts already dimensioned for this frame accept the 3RT2028-1NF30 without re-drilling.
Mounting and Integration
Mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5°, giving flexibility in tight enclosures. Minimum clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. The depth is 107 mm, height 85 mm, width 45 mm. Wire sizes accepted: solid or stranded 1-10 mm² for the main circuit, and 2x (0.5-1.5 mm²) or 2x (0.75-2.5 mm²) for auxiliary connections. The screw-type terminals are standard for panel wiring — no special tooling required beyond a screwdriver.