What it is and where it fits
The Siemens 3RT1024-1AG24 is a SIRIUS power contactor in Size S0, designed for switching motor loads in industrial control panels. The 24 VDC coil pulls in reliably; the contactor snaps onto a 35 mm DIN rail per EN 50022, so it integrates into any standard panel layout without extra bracketry. Rated for AC-2 and AC-4 duty: at 400 V it handles 5.5 kW in AC-2 (slip-ring motor starting) and 12.5 A in AC-4 (plugging/reversing). At 690 V it still delivers 7.5 kW, which covers most 400 V and 690 V motor circuits in European and export panels. The auxiliary contact block carries 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for control-circuit interlocking and status feedback. The screw-type main and auxiliary terminals accept solid or stranded wire up to 4 mm² (main) and 2.5 mm² (aux), with a max of 10 mm² on the main side.
Mounting and wiring checklist
Fastening method: screw and snap-on onto 35 mm standard mounting rail according to DIN EN 50022. Side-by-side mounting is permitted — no derating gap needed for the S0 frame in most configurations. Dimensions: 45 mm wide, 85 mm tall, 140 mm deep. That 45 mm width is a standard module slot — three contactors fit in a 135 mm wide DIN section, leaving room for a terminal block or overload relay. Wire sizes: main contacts accept 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), max 2x (0.75–4 mm²) solid/stranded, or AWG 2x (16–12), 2x (14–10), 1x 8. Auxiliary contacts take 2x (1–2.5 mm²), 2x (2.5–6 mm²), max 2x 10 mm², or AWG 2x (20–16), 2x (18–14), 1x 12. Strip length is standard for screw terminals — no special tooling needed.
Lifecycle and compliance
Compliance: the part carries a substance prohibitance date of 01.07.2006, aligning with RoHS (EU Directive 2002/95/EC). The reference code per IEC 81346-2 is Q (power switching device). Pollution degree 3 (conductive pollution or dry non-conductive that becomes conductive) — typical for industrial control panels not in clean-room environments. Protection: IP20 on the front (finger-safe), IP00 at the terminals (no protection). The contactor is intended for installation inside an enclosure that provides the final IP rating.
Coordination and fusing
For Type 1 coordination (no damage to the contactor but may need contact replacement after a fault): use gL/gG fuses rated 63 A. For Type 2 coordination (no damage and contacts remain usable): use gL/gG fuses rated 25 A. These values apply to the main circuit; the auxiliary circuit is protected by the control-circuit fuse. Operating temperature range: -25 °C to +60 °C during operation. Storage temperature is wider (not listed here, but typically exceeds the operating range).