Skip to main content
Log in
Siemens 3RT1044-1BE40 — Contactors

Siemens 3RT1044-1BE40 SIRIUS Power Contactor, S3, 55 A AC-4

MPN3RT1044-1BE40

Siemens SIRIUS, power contactor, size S3, 3RT1044-1BE40, screw-type terminals, AC-4 55 A at 400 V, 37 kW at 500 V, 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

3RT1044-1BE40 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-1BE40 — 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
3RT1044-1BE40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1044-1BE40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-1BE40 — 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
3RT1044-1BE40 — 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
3RT1044-1BE40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-1BE40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-1BE40 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth152 mm

Product details

SIRIUS S3 power contactor — what it carries and where it lands

The Siemens 3RT1044-1BE40 is a SIRIUS power contactor in size S3, rated for motor switching up to 37 kW at 500 V and 18.6 kW at 690 V. Coil draws 10 A at 24 V rated value and 2 A at 60 V, with an arcing time of 10 to 15 ms.

Mounting and wiring — panel fit

Dimensions are 146 mm high, 70 mm wide, 152 mm deep; the depth is the main thing to check against your enclosure depth or gland plate clearance. Solid wire acceptance: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded main circuit: 2x (10 to 50 mm²). The auxiliary/control terminals are the smaller solid range; the power terminals take the big stranded.

Frequently asked questions

What is the AC-4 rating on 3RT1044-1BE40?

AC-4 at 400 V rated value is 55 A. AC-4 is the severe-duty category for reversing, plugging, or inching loads where the contacts make and break under locked-rotor conditions.

What motor power can 3RT1044-1BE40 switch at 500 V?

37 kW at 500 V rated value. At 690 V it is rated 18.6 kW.

What is the depth of 3RT1044-1BE40?

152 mm depth. Height is 146 mm, width is 70 mm. The depth is the critical dimension for enclosure clearance.

Where can I buy 3RT1044-1BE40 and get current pricing?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send the quantity and target ship date.

MPN
3RT1044-1BE40