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Siemens 3RT1044-1BW44 — Contactors

Siemens 3RT1044-1BW44 SIRIUS Power Contactor, 37 kW at 500 V

MPN3RT1044-1BW44

Siemens SIRIUS 3RT1044-1BW44 power contactor, size S3, 37 kW at 500 V AC-3, 55 A AC-4 at 400 V, screw terminals, snap-on DIN rail mounting, IP20 front.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT1044-1BW44 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-1BW44 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V55 A
Rated value @ 400 V3 A
Rated value @ 500 V37 kW
Rated value @ 690 V18.6 kW
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1044-1BW44 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1044-1BW44 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-1BW44 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 250 A
Short-circuit coordination type 2, fusefuse gL/gG: 125 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1044-1BW44 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)
Conductor cross-section, solid or stranded2x (2.5 ... 16 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm and 75 mm standard mounting rail
Side-by-side mountingYes
3RT1044-1BW44 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-1BW44 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-1BW44 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth201 mm

Product details

The Siemens 3RT1044-1BW44 is a SIRIUS power contactor in size S3, rated for switching motor loads up to 37 kW at 500 V AC-3 and 18.6 kW at 690 V AC-3. For heavy-duty jogging or inching duty at AC-4, it handles 55 A at 400 V. The enclosure is rated IP20 on the front with cover or box terminal; the terminal itself is IP00.

Mechanical and Electrical Ratings

Maximum switching rates: 1000 cycles/hour at AC-1 and AC-3, 400 cycles/hour at AC-2, and 300 cycles/hour at AC-4. Arcing time is 10-15 ms; DC operating time is 14-20 ms. Dimensions: 146 mm height, 70 mm width, 201 mm depth. The depth is a key fit dimension for enclosure depth planning.

RoHS compliance date is 05/01/2012, indicating the part meets EU RoHS substance restrictions. The evidence does not list UL, CSA, or IEC certifications for this specific order code, but as a SIRIUS power contactor it is typically designed to IEC 60947-4-1 standards.

Frequently asked questions

What is the depth of 3RT1044-1BW44?

The depth is 201 mm, which is a key dimension for enclosure fit.

What wire sizes does the 3RT1044-1BW44 accept?

For solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). For stranded: 2x (10 to 50 mm²). Main circuit terminals are screw-type.

What compliance documentation is available for 3RT1044-1BW44?

RoHS compliance date is 05/01/2012. As a SIRIUS power contactor, it is designed to IEC 60947-4-1 standards. The evidence does not list UL or CSA certifications for this specific order code.

MPN
3RT1044-1BW44