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Siemens 3RT1044-1BB40 — Contactors

Siemens SIRIUS 3RT1044-1BB40 Power Contactor, 24 VDC Coil, S

MPN3RT1044-1BB40

Siemens SIRIUS power contactor, size S3, 24 VDC coil, screw-type terminals, IP20 front, 70 mm width, 146 mm height, 152 mm depth.

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

3RT1044-1BB40 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-1BB40 — 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
3RT1044-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1044-1BB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-1BB40 — 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
3RT1044-1BB40 — 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 DIN rail
Side-by-side mountingYes
3RT1044-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-1BB40 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth152 mm

Product details

Integrator's note

Rated for AC-3 motor switching at 37 kW / 500 V and 18.6 kW / 690 V.

Coil and switching performance

Coil pick-up is guaranteed at 80 % of rated voltage (19.2 VDC); drop-out occurs at 110 % (26.4 VDC). Arcing time on DC switching is 14...20 ms; on AC it is 10...15 ms.

Frequently asked questions

What is the depth of 3RT1044-1BB40?

The depth is 152 mm.

What solid wire sizes does 3RT1044-1BB40 accept?

It accepts 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), and a maximum of 2x (0.75...4 mm²) solid conductors.

MPN
3RT1044-1BB40