Siemens SIRIUS 3RT2028-1AC20 power contactor, S0 frame, 45 mm, screw-type coil terminals, DIN rail mounting.
| Parameter | Value |
|---|---|
| Contactor frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated operational current, AC-4 @ 400 V | 22 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 2 A |
| Rated value @ 690 V | 1 A |
| Rated value @ 230 V | 5 hp |
| 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 | 0.25 |
| 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 | gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA) |
| Short-circuit coordination type 2, fuse | gG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA) |
| Aux. switch short-circuit protection, fuse | gG: 10 A (500 V, 1 kA) |
| Parameter | Value |
|---|---|
| Main circuit connection | screw-type terminals |
| Aux. / control circuit connection | screw-type terminals |
| Conductor cross-section, solid | 1 ... 10 mm² |
| Conductor cross-section, solid or stranded | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 DIN rail according to DIN EN 60715 |
| 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 | 45 mm |
| Height | 85 mm |
| Depth | 97 mm |
| Parameter | Value |
|---|---|
| At AC | 4 ... 16 ms |
The 3RT2028-1AC20: Fastens to 35 mm DIN rail per DIN EN 60715. Required clearances: 10 mm upwards, 10 mm downwards, 10 mm forwards, and 6 mm at the side. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Arcing time is 10 ms. For auxiliary contact wiring, the terminals accept 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²) solid or stranded conductors.
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