Siemens 3RT2027-1AP00-ZW96 SIRIUS Power Contactor — S0 Frame, 27 A AC-3
The Siemens 3RT2027-1AP00-ZW96 is a SIRIUS power contactor in the S0 frame size, rated for 27 A at 480 V in AC-3 duty — the motor-switching rating that governs real-world load handling on pumps, fans, and compressors up to that current. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward/backward — useful when fitting into tight panel layouts where the rail isn't perfectly vertical. The screw-type terminals on both main contacts and the magnet coil accept solid or stranded wire from 1 to 10 mm², with double-wire capacity for 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²).
Duty Cycle and Switching Frequency
Maximum switching rates are duty-dependent: 1,000 operations per hour in AC-1 (resistive loads), 750/h in AC-2 and AC-3 (motor starting/running), 750/h in AC-3e, and 250/h in AC-4 (plugging/inching). Arcing time is a tight 10 ms, and the contactor's mechanical life is rated at 10 million operations typical.
Auxiliary Contact Ratings
The built-in auxiliary switch handles 10 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.6 A at 440 V — covering common control voltages across 24 VDC to 440 VAC.
Environmental and Installation
Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Clearances required: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. Dimensions are 85 mm height, 45 mm width, 97 mm depth — the 97 mm depth is the dimension to watch when planning gland-plate clearance or door clearance in shallow enclosures.