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Siemens 3RT1044-1FB46 — Contactors

Siemens 3RT1044-1FB46 SIRIUS Power Contactor, S3, 55 A AC-4

MPN3RT1044-1FB46

Siemens SIRIUS power contactor, 3RT1044-1FB46, size S3, 55 A AC-4 at 400 V, screw terminals, DIN rail mount.

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

3RT1044-1FB46 — Identification
ParameterValue
Contactor frame sizeS3
3RT1044-1FB46 — 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
3RT1044-1FB46 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1044-1FB46 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1044-1FB46 — 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
3RT1044-1FB46 — 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
3RT1044-1FB46 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1044-1FB46 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1044-1FB46 — Mechanical
ParameterValue
Width70 mm
Height163 mm
Depth201 mm

Product details

Mounting and panel fit

Mounts via screw or snap-on onto 35 mm or 75 mm DIN rail — the snap-on feature is handy when you're swapping one out in a tight cabinet; no need to loosen screws if the rail is clear. Side-by-side mounting is supported, so you can pack multiple contactors in a row without derating, as long as you respect the ambient temperature limits. Dimensions are 70 mm wide, 163 mm tall, 201 mm deep. Front protection is IP20, which is typical for contactors inside a locked panel — it keeps fingers out but isn't washdown-rated. The terminal area itself is IP00, meaning the wiring compartment is open; that's normal for screw terminals that need access.

Environmental and compliance

Operating temperature range is -25 to +60 °C, which covers most indoor industrial environments from cold warehouses to warm cabinets. Storage range is -55 to +80 °C, so it survives shipping and storage in extreme climates. Pollution degree 3 means it's rated for conductive pollution (condensation, light dust) typical of control rooms and light industrial floors.

Frequently asked questions

What wire sizes does the 3RT1044-1FB46 accept on the main terminals?

The screw-type main terminals accept solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). For stranded wire, it accepts 2x (10 to 50 mm²). There's also a separate terminal for 2x (2.5 to 16 mm²) solid or stranded.

What compliance documentation does this part have?

The part is RoHS compliant with a substance prohibition date of May 1, 2012. It carries IP20 front protection and is rated for pollution degree 3. The operating temperature range is -25 to +60 °C, storage -55 to +80 °C.

MPN
3RT1044-1FB46