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Siemens 3RT5044-1BB40 — Contactors

Siemens 3RT5044-1BB40 SIRIUS Power Contactor, 24 VDC Coil, 7

MPN3RT5044-1BB40

Siemens SIRIUS S3 power contactor, 24 VDC coil, screw-type terminals, 70 mm width, 152 mm depth, DIN-rail or screw mounting.

Siemens 3RT5044-1BB40 datasheet (PDF)
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

3RT5044-1BB40 — Identification
ParameterValue
Contactor frame sizeS3
3RT5044-1BB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 690 V18.6 kW
Rated value @ 230 V6 A
Rated value @ 24 V6 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT5044-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT5044-1BB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT5044-1BB40 — 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
3RT5044-1BB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
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 DIN rail
Side-by-side mountingYes
3RT5044-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT5044-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT5044-1BB40 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth152 mm

Product details

The Siemens 3RT5044-1BB40 is a SIRIUS S3 power contactor with a 24 VDC coil, rated for switching motor loads up to 59 kW at 400 V and 102 kW at 690 V (at 60 °C). It occupies a 70 mm wide footprint on 35 mm or 75 mm DIN rail, with screw-type terminals for the main and auxiliary circuits.

Side-by-side mounting is supported, so multiple contactors pack tightly in a panel without derating for heat buildup.

The 24 VDC coil draws 6 A at rated voltage. For 110 VDC the draw is 1 A, at 220 VDC it's 0.3 A, and at 230 VDC it's 6 A. The auxiliary and control circuit terminals are screw-type, accepting 2x (2.5...16 mm²) solid/stranded or 2x (10...1/0) AWG.

Rated for 1000 switching cycles per hour at DC, AC-1, AC-3, and AC-3e duty. At AC-4 (plugging/reversing) the maximum is 300 cycles per hour.

Frequently asked questions

Where can I buy 3RT5044-1BB40 and how do I get a price?

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

Will 3RT5044-1BB40 drop into a panel that was specified around 3RT5044-1BM40 without rewiring?

The 3RT5044-1BB40 shares the same S3 frame size, DIN-rail mounting, and screw-type terminal layout as the 3RT5044-1BM40. The key difference is the coil voltage — the -1BB40 is 24 VDC, while the -1BM40 uses a different control voltage. Panel cutout and wiring footprint are identical, so it drops in electrically if the coil voltage matches the control circuit.

What is 3RT5044-1BB40's listed depth (152 mm) on this component line?

The depth is 152 mm, with a width of 70 mm and height of 146 mm. These dimensions fit standard S3 contactor panel layouts.

What compliance documentation does this brand provide for 3RT5044-1BB40 (RoHS, REACH, UL, IEC)?

The part is RoHS compliant per substance prohibition date March 1, 2017. It carries pollution degree 3 rating and insulation voltage of 1000 V. Standard Siemens SIRIUS documentation includes IEC/EN 60947-4-1 compliance; UL and CSA listings are typical for the series but should be confirmed against the specific catalog number at order time.

MPN
3RT5044-1BB40