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Siemens 3RT5044-1AC20 — Contactors

Siemens 3RT5044-1AC20 SIRIUS Power Contactor, S3 Frame, 1000

MPN3RT5044-1AC20

Siemens SIRIUS 3RT5044-1AC20, S3 power contactor, rated insulation voltage 1000 V, screw-type terminals, 70 mm wide, 139 mm deep, 146 mm tall, screw and snap-on mounting on 35 mm and 75 mm DIN rail.

Siemens 3RT5044-1AC20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT5044-1AC20 — Identification
ParameterValue
Contactor frame sizeS3
3RT5044-1AC20 — 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
3RT5044-1AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.27
Rated value @ 50 Hz24 V
3RT5044-1AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT5044-1AC20 — 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
3RT5044-1AC20 — 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
3RT5044-1AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT5044-1AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT5044-1AC20 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth139 mm
3RT5044-1AC20 — Specifications
ParameterValue
At AC5 000 1/h

Product details

It carries a rated insulation voltage of 1000 V, which means it can be used in 400 V and 690 V systems with headroom for transient overvoltages (pollution degree 3). The screw-type main circuit terminals accept 2x (2.5 to 16 mm²) solid or stranded copper, or 2x (10 to 1/0 AWG).

Mounts on 35 mm or 75 mm DIN rail via screw and snap-on. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, which helps in tight enclosures where the rail is angled.

Environmental limits

Rated for operation from -25 to +60 °C ambient, with storage from -55 to +80 °C.

Frequently asked questions

What compliance documentation is available?

The part is RoHS and REACH compliant per the March 1, 2017 substance prohibition date. It carries a rated insulation voltage of 1000 V per IEC 60947 standards.

What are the mounting dimensions?

Width 70 mm, depth 139 mm, height 146 mm. Mounts on 35 mm or 75 mm DIN rail with screw and snap-on.

How does this compare to the 3RT1036-1AB00?

The 3RT5044-1AC20 is a newer SIRIUS S3 frame contactor with 1000 V insulation voltage and screw terminals. The 3RT1036-1AB00 is an older SIRIUS 3RT1 generation part; the 3RT5044 has a wider terminal range (up to 16 mm² vs typically 6 mm² on the 3RT1) and higher insulation rating. Panel footprint differs — the 3RT5044 is 70 mm wide vs 45 mm on the 3RT1036, so it will not drop into a panel cut for the smaller frame without re-drilling the DIN rail or using an adapter plate.

MPN
3RT5044-1AC20