Siemens 3RT1024-1AR60 — SIRIUS S0 Power Contactor, 24 VDC Coil
The Siemens 3RT1024-1AR60 is a SIRIUS S0-frame power contactor for switching motor loads and resistive circuits in control panels. It mounts via screw or snap-on onto a 35 mm DIN rail per EN 50022, with a 45 mm width that fits standard panel spacing. The 24 VDC coil holds at nominal and drops out below the undervoltage threshold typical for PLC-driven outputs. Rated for AC-2 duty at 5.5 kW and AC-4 at 12.5 A, both at 400 V, this contactor handles squirrel-cage motor starting and plugging/reversing loads. The screw-type main terminals accept up to 2x 10 mm² stranded or 1x 8 AWG, making it straightforward to land in a mixed-gauge panel. Pollution degree 3 rating means it tolerates conductive dust and humidity typical of industrial enclosures.
Switching Ratings and Coordination
The DC switching matrix covers 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — useful for interposing relays or small DC motor brakes. AC-12 resistive switching is rated to 10 A maximum. For motor protection, Type 2 coordination requires a 25 A gL/gG fuse; Type 1 allows up to 63 A. The 400 V AC-2 power rating (5.5 kW) matches a typical 7.5 hp motor at 400 V three-phase.
Integration and Environment
Operating temperature range is -25 to +60 °C, with a maximum altitude of 2000 m — no derating needed for most panel environments. The front face carries IP20 protection (finger-safe), while the terminal area is IP00, so it requires enclosure protection. Side-by-side mounting is permitted with zero spacing, saving DIN rail space; 6 mm clearance is required at the sides for airflow if derating is a concern.