Siemens SIRIUS, power contactor, size S3, 3RT1344-1AN20, 42 kW at 230 V, screw-type terminals, IP20 front, snap-on 35/75 mm rail.
| Parameter | Value |
|---|---|
| Contactor frame size | S3 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated value @ 400 V | 3 A |
| 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 | 220 V |
| Parameter | Value |
|---|---|
| Main poles | 4 |
| Main NO contacts | 4 |
| 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 | 93 mm |
| Height | 146 mm |
| Depth | 139 mm |
| Parameter | Value |
|---|---|
| At AC | 10 ... 25 ms |
The Siemens 3RT1344-1AN20 is a SIRIUS S3 power contactor rated 42 kW at 230 V, 60 °C — sized for motor switching in a standard 400 V three-phase panel. Screw-type main terminals accept stranded 2x (10... 50 mm²) or solid 2x (0.5... 1.5 mm²) through 2x (0.75... 4 mm²). IP20 on the front with cover or box terminal; the terminal body itself is IP00, so panel builders should account for clearance to live parts.
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