Siemens SIRIUS power contactor, 3RT1035-1BW40, 48 VDC coil, S2 frame size, screw terminals, IP20 front, DIN rail mount.
| Parameter | Value |
|---|---|
| Contactor frame size | S2 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated operational current, AC-4 @ 400 V | 35 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 22 kW |
| Rated value @ 690 V | 11.4 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: 125 A |
| Short-circuit coordination type 2, fuse | fuse gL/gG: 63 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 (0.75 ... 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 standard mounting rail according to DIN EN 50022 |
| 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 | 55 mm |
| Height | 112 mm |
| Depth | 130 mm |
The 48 VDC coil pulls in with a typical arcing time of 10 to 15 ms and a DC dropout delay of 20 to 25 ms — fast enough for most sequencing but worth noting if your safety circuit needs a defined off-delay. Rated for AC-3 motor switching at 400 V, it delivers 18.5 kW, and at 500 V it handles 22 kW.
The S2 footprint is 55 mm wide, 112 mm tall, 130 mm deep. The minimum permissible conductor at 40 °C is 16 mm² — that's the thermal limit, not a wiring convenience.
The coil is rated at 48 VDC. At that voltage the contactor draws 10 A inrush; at 60 VDC it draws 2 A, and at 110 VDC it draws 1 A.
At 400 V AC-3 duty, the contactor is rated for 18.5 kW. At 500 V AC-3 it handles 22 kW.
This part is available to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time.
The part carries a RoHS compliance date of 05/01/2012. The front is IP20 rated; the terminals are IP00. Pollution degree 3 per IEC 60947 applies.
Alternative models and sibling configurations in the same Siemens series. For obsolete or discontinued parts, these models can serve as compatible replacements or functional alternatives for plant maintenance.
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