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Siemens 3RT1044-3AD00 — Contactors

Siemens 3RT1044-3AD00 SIRIUS S3 Power Contactor, 42 V 50 Hz

MPN3RT1044-3AD00

Siemens SIRIUS S3 power contactor, 3RT1044-3AD00, 42 V 50 Hz coil, 37 kW AC-3 at 400 V, screw-type terminals, snap-on DIN rail.

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

3RT1044-3AD00 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-3AD00 — 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
3RT1044-3AD00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz42 V
3RT1044-3AD00 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-3AD00 — 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
3RT1044-3AD00 — 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
3RT1044-3AD00 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-3AD00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-3AD00 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth139 mm
3RT1044-3AD00 — Specifications
ParameterValue
At AC10 ... 19 ms

Product details

The coil is rated at 42 V at 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage at 50 Hz. This is a specific voltage variant — not the common 24 V or 230 V — so verify your control voltage matches before specifying. For motor duty, the contactor is rated 37 kW at 400 V in AC-3 category (squirrel-cage motors, starting and disconnecting running), and 30 kW at 400 V in AC-2 (slip-ring motors, starting and switching off). In AC-4 duty (inching, plugging, reversing) it handles 55 A at 400 V — the most demanding thermal cycle, so that figure governs applications with frequent jogging.

The contactor occupies 70 mm width, 146 mm height, and 139 mm depth — a compact S3 footprint. Side-by-side mounting is permitted, which saves rail space in dense panels. The main current circuit uses screw-type terminals; solid wire accepts 2x (0.25 to 2.5 mm²), stranded accepts 2x (10 to 50 mm²), and a mixed solid-or-stranded range of 2x (2.5 to 16 mm²) covers most panel wiring. Pollution degree 3 (conductive pollution) means it is suited for industrial environments where occasional condensation or light contamination occurs. Mechanical endurance is rated at 10,000,000 operating cycles typical, with switching rates up to 1,000 cycles per hour for AC-1 and AC-3, 400/h for AC-2, and 300/h for AC-4.

The part carries a RoHS substance prohibition date of 05/01/2012, confirming compliance with the EU RoHS directive for the materials in the bill of materials.

Frequently asked questions

What are the key ratings for this contactor?

The coil is 42 V at 50 Hz. Motor ratings: 37 kW at 400 V AC-3, 30 kW at 400 V AC-2, and 55 A at 400 V AC-4. Mechanical endurance is 10,000,000 cycles typical.

What is the physical size and mounting of this contactor?

It is a SIRIUS S3 frame: 70 mm wide, 146 mm high, 139 mm deep. Mounts via screw or snap-on onto 35 mm or 75 mm DIN rail. Side-by-side mounting is allowed.

What compliance documentation does this part have?

The part is RoHS compliant with a substance prohibition date of 05/01/2012. It is designed for pollution degree 3 environments and carries IP20 on the front face with cover.

Will this contactor work with 24 V or 230 V control circuits?

No — the coil is specifically rated at 42 V at 50 Hz with an operating range of 0.8 to 1.1 times that voltage. It will not pull in reliably on 24 V or 230 V. A different coil variant is needed for those voltages.

MPN
3RT1044-3AD00