The Siemens 3RT2027-1AC24 is a SIRIUS power contactor in the S0 frame size, with a 24 VDC magnet coil terminated at screw-type terminals. It fastens via screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° forward/backward tilt. Rated switching frequency depends on the duty class: at AC-1 (resistive loads) it handles up to 1,000 operations per hour; at AC-3 (squirrel-cage motors) and AC-3e, 750 ops/h; at AC-4 (plugging/inching), 250 ops/h. The arcing time sits at 10 ms, and the closing time at 50 Hz is 0.25 s, at 60 Hz 0.28 s.
Mounting and integration
The contactor occupies a 45 mm width on the DIN rail, with a depth of 141 mm and height of 85 mm. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. These clearances govern gland-plate layout and adjacent device spacing in a panel. Wire range for main contacts: solid or stranded 1 to 10 mm², or 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²) for finer parallel runs. The screw-type terminals accept this range without special ferrules, though stranded conductors benefit from bootlace ferrules for consistent torque.
Lifecycle and sourcing
Operating temperature range spans -25 to +60 °C during operation, with storage from -55 to +80 °C. The mechanical service life is rated at 10,000,000 operations typical, which supports high-cycle applications like conveyor or pump control without premature wear.