S0 power contactor for motor and resistive loads
The Siemens SIRIUS 3RT2027-1AL24-3MA0 is a size S0 power contactor built for switching motor and resistive loads in control panels. It carries a 24 VDC coil with screw-type terminals and mounts onto 35 mm DIN rail per DIN EN 60715 — the standard snap-on footprint for European panel builds. At 45 mm wide, it fits the S0 frame slot without crowding adjacent devices.
What the ratings mean for your BOM line
The AC-3 switching frequency of 750 operations per hour tells you this contactor handles motor start-stop cycles at a solid production pace — think conveyor sections or pump stations that cycle every few seconds. The AC-1 resistive rating at 1000 ops/h covers heater banks or lighting contactor duty. Mechanical life is typical at 10 million operations, so it outlasts most panel refreshes. The 24 VDC coil draws 6 A at rated voltage; verify your control transformer can support that inrush across multiple contactors pulling simultaneously. For motor sizing: the contactor is rated 5 hp at 230 V and 3 A at 400 V. That puts it in the range for small three-phase motors — 2.2 kW at 400 V or a 3.7 kW at 230 V, roughly. The screw-type main terminals accept solid or stranded wire from 1 to 10 mm², which covers standard motor feeds up to 4 mm² for a 2.2 kW drive.
Panel integration and mounting flexibility
Mounting position is unusually flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward. That matters when you're squeezing this into a tight gland-plate layout or a swing-frame panel. Clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. The 141 mm depth is the body only — add coil terminal projection when calculating enclosure depth. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C, so it handles unheated warehouses or cabinet summers without derating.