Siemens SIRIUS 3RT1044-1AB04 power contactor, size S3, screw-type terminals, 37 kW at 500 V, 55 A AC-4 at 400 V, snap-on 35/75 mm rail.
| Parameter | Value |
|---|---|
| Contactor frame size | S3 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated operational current, AC-4 @ 400 V | 55 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 37 kW |
| Rated value @ 690 V | 18.6 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 | AC |
| Rated value @ 50 Hz | 0.8 ... 1.1 |
| Rated value @ 50 Hz | 24 V |
| 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: 250 A |
| Short-circuit coordination type 2, fuse | fuse gL/gG: 125 A |
| Aux. switch short-circuit protection, fuse | fuse gL/gG: 10 A |
| Parameter | Value |
|---|---|
| Main circuit connection | screw-type terminals |
| Aux. / control 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, solid or stranded | 2x (2.5 ... 16 mm²) |
| Conductor cross-section, finely stranded w/ ferrule | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| Mounting method | screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail |
| 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 |
| Storage temperature range | -55 ... +80 °C |
| Installation altitude, max. | 2 000 m |
| Parameter | Value |
|---|---|
| Width | 70 mm |
| Height | 146 mm |
| Depth | 188 mm |
| Parameter | Value |
|---|---|
| At AC | 10 ... 19 ms |
It's rated 37 kW at 500 V for AC-3 duty, which covers most three-phase induction motors in that power band — conveyors, pumps, fans. For severe switching like reversing or inching (AC-4), it handles 55 A at 400 V, so it survives the arcing of frequent plugging without welding contacts.
The solid wire range is 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²); stranded accepts 2x (10... 50 mm²). That's enough cross-section for the 55 A AC-4 current without doubling up lugs.
AC-3 motor rating is 37 kW at 500 V; AC-4 severe-duty rating is 55 A at 400 V. Coil is 24 V at 50 Hz.
Snap-on for 35 mm or 75 mm DIN rail. Main terminals accept solid 2x (0.5... 1.5 mm²) up to max 2x (0.75... 4 mm²), and stranded 2x (10... 50 mm²). Screw-type terminals.
The 3RT1044-1AB04 is a size S3 contactor; the 3RT1036-1AB00 is a different frame size. Footprint and terminal layout differ — panel cutouts and wiring would need to be checked against the respective dimensional drawings. No direct mechanical interchange without verifying rail position and wire routing.
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