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Siemens 3RT1044-3BE40 — Contactors

Siemens SIRIUS 3RT1044-3BE40 Power Contactor, 55 A AC-4, 37

MPN3RT1044-3BE40

Siemens SIRIUS power contactor, size S3, 3RT1044-3BE40, 55 A AC-4 at 400 V, 37 kW at 500 V, screw-type terminals, snap-on mounting.

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

3RT1044-3BE40 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-3BE40 — 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
3RT1044-3BE40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1044-3BE40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-3BE40 — 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
3RT1044-3BE40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, solid or stranded2x (2.5 ... 16 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm and 75 mm standard mounting rail
Side-by-side mountingYes
3RT1044-3BE40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-3BE40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-3BE40 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth152 mm

Product details

For AC-2 duty (slip-ring motors or wound-rotor applications), it delivers 30 kW at 400 V. The AC-3 rating for standard squirrel-cage motors is 37 kW at 500 V and 18.6 kW at 690 V.

Dimensions are 70 mm wide, 146 mm high, 152 mm deep — fits standard enclosure cutouts for the S3 frame.

Terminals and wiring

Main circuit connections are screw-type terminals. Accepts solid conductors 2x (0.25... 2.5 mm²) for control wiring and stranded conductors 2x (10... 50 mm²) for power cables. The box terminal design provides IP20 finger protection on the front with the cover installed; the terminal body itself is IP00, so maintain clearance in the enclosure.

RoHS compliance substance prohibition date is 05/01/2012, covering the EU RoHS directive.

Frequently asked questions

What compliance documentation is available for this contactor?

RoHS compliance is confirmed with a substance prohibition date of 05/01/2012. The product carries IP20 front protection and is rated for pollution degree 3.

What is the closest functional peer to the 3RT1044-3BE40?

The 3RT1036-1AB00 is a smaller S0-frame contactor. It will not drop into the same panel without rewiring — the S3 frame has different dimensions (70 mm wide vs. 45 mm for S0) and higher current ratings. Use the 3RT1044-3BE40 when the load requires the 55 A AC-4 capability or the 37 kW at 500 V motor rating.

MPN
3RT1044-3BE40