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Siemens 3RT1044-3AF04 — Contactors

Siemens 3RT1044-3AF04 SIRIUS Power Contactor, 30 kW AC-2, S3

MPN3RT1044-3AF04

Siemens SIRIUS power contactor, 3RT1044-3AF04, S3 frame, 30 kW AC-2 at 400 V, 55 A AC-4, screw 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

3RT1044-3AF04 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-3AF04 — 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
3RT1044-3AF04 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz110 V
3RT1044-3AF04 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-3AF04 — 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
3RT1044-3AF04 — 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
3RT1044-3AF04 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-3AF04 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-3AF04 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth188 mm
3RT1044-3AF04 — Specifications
ParameterValue
At AC10 ... 19 ms

Product details

The headline motor-switching rating is 30 kW under AC-2 duty at 400 V — that's the category for slip-ring motors, wound-rotor drives, and other loads where starting current and switching frequency are moderate. For the heavier AC-4 duty (plugging, inching, reversing), it's rated 55 A at 400 V, which covers frequent jogging or reversing cycles without derating the contactor prematurely. The contactor carries a mechanical life of 10 million operations typical, and the electrical endurance varies by duty: up to 1,000 cycles per hour in AC-1 and AC-3, 400 cycles per hour in AC-2, and 300 cycles per hour in AC-4. That means it's built for continuous process lines where the contactor cycles several times a minute, not just a start-stop once per shift. The coil draws 10 A at 24 V rated value, with lower draws at higher control voltages — 6 A at 230 V, 3 A at 400 V, and 1 A at 110 V. The main circuit uses screw-type terminals, accepting solid conductors 2x (0.25 to 2.5 mm²) and stranded 2x (10 to 50 mm²). The IP20 front protection (IP20 on the front with cover or box terminal) means it's safe for finger contact in a closed panel, while the terminal itself is IP00 — so it requires enclosure protection against tools and debris.

The contactor carries a substance prohibitance date of 05/01/2012, indicating RoHS compliance (EU RoHS 2011/65/EU). That covers most indoor industrial installations, including non-conditioned electrical rooms in warm climates.

Frequently asked questions

What are the key dimensions for panel layout?

The contactor measures 146 mm height, 70 mm width, and 188 mm depth. It mounts on 35 mm or 75 mm standard DIN rails via screw and snap-on.

What compliance documentation is available?

The part has a RoHS substance prohibitance date of 05/01/2012, confirming compliance with EU RoHS. It is rated for pollution degree 3, suitable for industrial environments.

Can this contactor handle reversing or jogging duty?

Yes, it is rated 55 A at AC-4 duty at 400 V, which covers plugging, inching, and reversing applications. The maximum switching frequency in AC-4 is 300 cycles per hour.

MPN
3RT1044-3AF04