The Siemens 3RT2026-2BB44 is a SIRIUS S0 power contactor with a 24 V DC coil and spring-type terminals. It is a straightforward motor-switching component for control panels, rated for AC-3 duty up to 750 operations per hour. The S0 frame keeps it at 45 mm wide and 154 mm deep, slotting into a standard 35 mm DIN rail mount.
Panel mounting and wiring
Mounts on 35 mm DIN rail per EN 60715, either snap-on or screw-fixed. Spring terminals accept solid or stranded wire from 1 to 10 mm² — that covers most motor feeder sizes for a contactor this class. Minimum clearances around the block: 10 mm up, down, and forward, 6 mm at the sides. The terminal arrangement is for main contacts only; there is no built-in auxiliary switch on this variant.