Side-by-side mounting is permitted, so multiple contactors can pack tightly on the DIN rail without derating for proximity — useful when building a motor control center section. The IP20 rating on the front with cover or box terminal means the live parts are finger-safe once the cover is on; the terminal itself is IP00, so the wiring compartment must be inside an enclosure.
Siemens SIRIUS 3RT1045-1AN20 Power Contactor, Size S3, 70 mm
MPN3RT1045-1AN20
Siemens SIRIUS power contactor, Size S3, 3RT1045-1AN20, screw-type terminals, 70 mm width, 146 mm height, 139 mm depth, screw and snap-on mounting for 35 mm and 75 mm rail.
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Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Contactor frame size | S3 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated operational current, AC-4 @ 400 V | 66 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 45 kW |
| Rated value @ 690 V | 21.1 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 | 220 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: 160 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 | 139 mm |
| Parameter | Value |
|---|---|
| At AC | 10 ... 25 ms |
Product details
Frequently asked questions
What are the key dimensions for panel layout?
Width 70 mm, height 146 mm, depth 139 mm. Mounts on 35 mm or 75 mm DIN rail.
What wire sizes does the screw terminal accept?
Solid: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (10 to 50 mm²).
MPN
3RT1045-1AN20