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Siemens 3RT1045-1AB00 — Contactors

Siemens 3RT1045-1AB00 SIRIUS Power Contactor, S3, 37 kW AC-2

MPN3RT1045-1AB00

Siemens SIRIUS power contactor, size S3, screw-type terminals, 37 kW at AC-2 400 V, 66 A at AC-4 400 V, snap-on mounting.

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

3RT1045-1AB00 — Identification
ParameterValue
Contactor frame sizeS3
3RT1045-1AB00 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V66 A
Rated value @ 400 V3 A
Rated value @ 500 V45 kW
Rated value @ 690 V21.1 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
3RT1045-1AB00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz24 V
3RT1045-1AB00 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1045-1AB00 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 250 A
Short-circuit coordination type 2, fusefuse gL/gG: 160 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1045-1AB00 — 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 standard mounting rail
Side-by-side mountingYes
3RT1045-1AB00 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1045-1AB00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1045-1AB00 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth139 mm
3RT1045-1AB00 — Specifications
ParameterValue
At AC10 ... 25 ms

Product details

Its headline ratings are 37 kW at AC-2 duty (400 V) and 66 A at AC-4 duty (400 V) — the AC-2 figure governs slip-ring motor starting, while AC-4 covers plugging and inching, so this part handles heavy reversing or jogging applications without derating.

Dimensions are 70 mm wide, 146 mm high, 139 mm deep, so it occupies a standard S3 footprint. Side-by-side mounting is permitted, which saves rail space when grouping multiple contactors.

Terminals and wiring

Accepts solid conductors 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²), and stranded conductors 2x (10... 50 mm²). IP20 on the front with cover or box terminal; the terminal itself is IP00 — so panel builders should plan for enclosure protection if the contactor is exposed.

Degree of pollution 3, meaning it tolerates conductive pollution in industrial environments. RoHS compliance date listed as 05/01/2012.

Frequently asked questions

What is the closest functional second-source — 3RT1036-1AB00?

The 3RT1036-1AB00 is a smaller SIRIUS contactor (size S2) with lower ratings. The 3RT1045-1AB00 (size S3) will not drop into a panel wired for the S2 without rewiring the power terminals and checking the DIN-rail space — the S3 frame is physically larger. Verify your load requirements against the 37 kW AC-2 rating before substituting.

What compliance documentation does this brand provide for 3RT1045-1AB00?

RoHS compliance is declared with a substance prohibition date of 05/01/2012. The part carries IP20 protection on the front and is rated for pollution degree 3, aligning with IEC 60947-4-1 for contactors.

MPN
3RT1045-1AB00