The Siemens SIRIUS 3RT1034-3EL24-0KS0 is a power contactor in the S2 frame size, designed for switching motor loads and resistive circuits in control panels. It mounts via screw or snap-on onto a standard 35 mm DIN rail per EN 50022, with a 55 mm width that leaves room for adjacent devices in a crowded row. The screw-type terminals on the main circuit accept solid or stranded conductors up to 2x 25 mm² (stranded), covering most motor branch feeds up to the contactor's rating.
Ratings and what they mean for your panel
The AC-1 resistive rating of 10 A at 24 V and 6 A at 230 V tells you the continuous current it can carry for heater or lighting loads. For motor duty, the key numbers are 18.5 kW at 500 V and 10 kW at 690 V — that's the motor power it can switch under AC-3 (starting/running) conditions. The switching frequency varies by duty: up to 1 200 cycles per hour for AC-1 resistive, 1 000 for AC-3 motor starts, and 250 for AC-4 plugging/reversing. That last number matters if your application does frequent inching or reversing — it's the limiting factor for contactor life in those cycles. The contactor is rated for pollution degree 3, which is the standard for industrial control panels where conductive dust or condensation can occur. IP20 on the front face means finger-safe from the panel front; the terminal area is IP00, so it relies on the enclosure for protection against accidental contact. Operating temperature range of -25 to +60 °C covers most plant-floor environments, with storage tolerance from -55 to +80 °C for spares held in a warehouse.
Panel integration notes
Snap-on mounting onto 35 mm DIN rail per EN 50022 — no tools needed for installation. Side-by-side mounting is permitted, so you can gang multiple contactors without spacing. The screw terminals accept 2x (0.75... 16 mm²) solid or stranded for the main circuit, and 2x (0.25... 2.5 mm²) solid for control wiring. Strip length and torque values follow standard Siemens terminal specifications; no special tooling required.