What This Part Is and Where It Fits
The Siemens SIRIUS 3RT2026-1AC20-0UA0 is a Size S0 power contactor with a built-in auxiliary switch, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. It occupies a 45 mm wide footprint in the panel, with dimensions of 85 mm height and 97 mm depth — that depth is the dimension to watch when laying out the gland plate or door clearance.
Mounting and Wiring Constraints
Mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5° on a vertical surface. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. Wire range accepts solid or stranded conductors from 1 to 10 mm², with dual-wire capability for 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The main contact arrangement is 16 to 8 — a 4-pole configuration with normally open and normally closed pairs.
Switching Duty and Thermal Limits
Rated for AC-1 resistive loads at up to 1000 operations per hour, AC-2 and AC-3 motor switching at 750 ops/h, and AC-4 plugging/reversing at 250 ops/h. Arcing time sits at 10 ms. The magnet coil uses screw-type terminals; auxiliary switching current is rated at 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C.