The Siemens 3RT2326-2AC20 is a SIRIUS contactor in the S0 frame size, with a 24 VAC 50/60 Hz coil drawing 0.25 VA at 50 Hz and 0.28 VA at 60 Hz. Main contacts are rated 18 A at 400 V AC-3 and 8 A at 400 V AC-1 — the AC-3 figure governs motor switching up to that current, while AC-1 covers resistive loads. The coil terminates via spring-type terminals; main and auxiliary power connections accept solid 2x (0.5... 2.5 mm²) or stranded 1... 10 mm² wire.
Panel fit and mounting
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The S0 footprint is 60 mm wide, 102 mm tall, and 97 mm deep — plan for that depth when routing behind the gland plate. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. The mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward, which helps when the panel layout is tight.
Switching performance and auxiliary contacts
Arcing time is 10 ms; the AC switching time (closing + opening) spans 4 to 16 ms. The contactor comes with an auxiliary switch built in, and up to 2 additional auxiliary contact blocks can be attached. Mechanical endurance is rated at 10 million operating cycles typical — relevant for high-cycle conveyor or shuttle applications where the contactor sees frequent pick-and-drop sequences.