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Siemens 3RT1044-1BP40 — Contactors

Siemens 3RT1044-1BP40 SIRIUS Power Contactor, Size S3, 55 A

MPN3RT1044-1BP40

Siemens SIRIUS power contactor, size S3, 3RT1044-1BP40, 55 A AC-4 at 400 V, 37 kW at 500 V AC-2, screw 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

3RT1044-1BP40 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-1BP40 — 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
3RT1044-1BP40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1044-1BP40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-1BP40 — 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
3RT1044-1BP40 — 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
3RT1044-1BP40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-1BP40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-1BP40 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth152 mm

Product details

It handles 55 A in AC-4 duty at 400 V — that's the rugged reversing or inching profile — and delivers 37 kW at 500 V in AC-2 duty, which covers slip-ring motor starting. The coil pulls 230 V rated value, and the contactor carries a full set of voltage-dependent current ratings: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V, and 30 W at 1000 V.

Mounting and wiring reality

Snaps onto 35 mm or 75 mm standard DIN rail — screw and snap-on fastening method. Main circuit wiring uses screw-type terminals; solid wire accepts 2x (0.5…1.5 mm²), 2x (0.75…2.5 mm²), max 2x (0.75…4 mm²), and stranded goes up to 2x (10…50 mm²). The front face carries IP20 with the cover or box terminal; the terminal body itself is IP00.

Thermal and mechanical endurance

Rated for 10 million typical mechanical operations. Maximum switching rates: 1 000 cycles/hour at AC-1 and AC-3, 400 at AC-2, and 300 at AC-4.

Frequently asked questions

Who supplies 3RT1044-1BP40 and how is it quoted for volume purchases?

This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at the time of quote.

What compliance documentation does this brand provide for 3RT1044-1BP40?

The brand provides RoHS compliance with a substance prohibition date of 05/01/2012. The part is also rated for pollution degree 3 per IEC standards.

MPN
3RT1044-1BP40