SIRIUS S0 power contactor — 24 VDC coil, spring-type terminals
The Siemens 3RT2027-2BB44-ZX95 is a SIRIUS S0-frame power contactor with a 24 VDC coil and spring-type terminals on both the coil and main contacts. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, making it a direct panel fit for standard industrial control cabinets.
Switching ratings and operating cycle
Rated for AC-3 motor switching at 750 operations per hour maximum, this contactor handles the typical cycling of conveyors, pumps, and fans without derating. AC-4 duty (plugging/reversing) is limited to 250 ops/h — a real constraint if your application involves frequent inching or reversing. Coil pickup is 0.8 x rated voltage (19.2 VDC), dropout below that threshold.
Coil and auxiliary contact ratings
The 24 VDC coil draws 6 A at rated voltage, dropping to lower hold-in current. Auxiliary contact ratings are provided for DC switching at various voltages: 2 A at 48 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. No built-in auxiliary switch block is included — order separately if needed.
Environmental and mechanical specs
Operating temperature range is -25 to +60 °C; storage range -55 to +80 °C. Mechanical life is 10 million operations typical. The contactor can be mounted in any orientation within ±180° rotation and ±22.5° tilt on a vertical surface. Clearances: 10 mm upwards, forwards, and downwards; 6 mm at the sides. Depth is 154 mm, width 45 mm, height 102 mm.