Siemens SIRIUS power contactor, 3RT1024-1BM40, size S0, 45 mm width, screw-type terminals, IP20 front, 101 mm depth.
| Parameter | Value |
|---|---|
| Contactor frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-4 @ 400 V | 12.5 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 7.5 kW |
| Rated value @ 690 V | 7.5 kW |
| Rated value @ 230 V | 6 A |
| Rated value @ 24 V | 10 A |
| Rated value @ 60 V | 2 A |
| Rated value @ 110 V | 1 A |
| Rated value @ 220 V | 0.3 A |
| Parameter | Value |
|---|---|
| Control supply voltage type | DC |
| Parameter | Value |
|---|---|
| Main poles | 3 |
| Main NO contacts | 3 |
| Auxiliary contact reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Parameter | Value |
|---|---|
| Short-circuit coordination type 1, fuse | fuse gL/gG: 63 A |
| Short-circuit coordination type 2, fuse | fuse gL/gG: 25 A |
| Aux. switch short-circuit protection, fuse | fuse gL/gG: 10 A |
| Parameter | Value |
|---|---|
| Main circuit connection | screw-type terminals |
| Conductor cross-section, solid | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²) |
| Conductor cross-section, finely stranded w/ ferrule | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| Side-by-side mounting | Yes |
| Parameter | Value |
|---|---|
| Durability (operating cycles, typ.) | 10 000 000 |
| Durability with aux. switch block (cycles, typ.) | 10 000 000 |
| Parameter | Value |
|---|---|
| Operating temperature range | -25 ... +60 °C |
| Parameter | Value |
|---|---|
| Width | 45 mm |
| Height | 85 mm |
| Depth | 101 mm |
The front face carries IP20 protection, while the terminals are IP00 — expect that when wiring live.
The contactor is rated for AC-2 duty at 400 V at 5.5 kW, and AC-4 at 400 V at 12.5 A — the AC-4 figure is the one to watch for frequent jogging or reversing. Coil holding power is 5.4 W DC, steady-state.
The depth is 101 mm.
The screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²) solid conductors.
Both are SIRIUS contactors with the same 45 mm width and DIN-rail mounting, so the footprint is compatible. However, the 3RT1024-1BM40 is size S0 with higher current ratings — verify that the coil voltage and auxiliary contact arrangement match your panel wiring before substitution.
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