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Siemens 3RT1044-3AC20 — Contactors

Siemens 3RT1044-3AC20 SIRIUS Power Contactor, S3 Frame, 50/6

MPN3RT1044-3AC20

Siemens SIRIUS, power contactor, 3RT1044-3AC20, S3 frame size, screw-type terminals, 50/60 Hz rated, IP20 front.

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

3RT1044-3AC20 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-3AC20 — 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
3RT1044-3AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz24 V
3RT1044-3AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-3AC20 — 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
3RT1044-3AC20 — 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
3RT1044-3AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-3AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-3AC20 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth139 mm
3RT1044-3AC20 — Specifications
ParameterValue
At AC10 ... 19 ms

Product details

Side-by-side mounting is allowed, which helps when you're packing multiple contactors into a tight panel row. The S3 frame keeps the footprint manageable at 70 mm wide by 146 mm tall by 139 mm deep.

Terminal and wiring

Main circuit terminals accept solid wire from 0.25 mm² up to 2.5 mm² in a dual-entry configuration, and stranded wire from 10 mm² up to 50 mm². That covers everything from control wiring to motor power leads without needing adapters. The front-facing terminals carry an IP20 rating with the cover box terminal installed — enough for basic finger protection inside a panel.

Frequently asked questions

Where can I buy the 3RT1044-3AC20 and 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 — submit an RFQ for a firm price and lead time.

What is the depth of the 3RT1044-3AC20?

The depth is listed at 139 mm. Overall dimensions are 70 mm wide by 146 mm tall.

What wire sizes does the main circuit accept?

Solid wire: 2x (0.25 to 2.5 mm²). Stranded wire: 2x (10 to 50 mm²). Also accepts 2x (2.5 to 16 mm²) for solid or stranded.

MPN
3RT1044-3AC20