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Siemens 3RT1045-1AR10 — Contactors

Siemens 3RT1045-1AR10 SIRIUS S3 Power Contactor, 37 kW AC-3

MPN3RT1045-1AR10

Siemens SIRIUS S3 power contactor, 3RT1045-1AR10, 37 kW at 400 V AC-3, screw-type terminals, screw and snap-on mounting for 35/75 mm 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

3RT1045-1AR10 — Identification
ParameterValue
Contactor frame sizeS3
3RT1045-1AR10 — 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
3RT1045-1AR10 — Control & Coil
ParameterValue
Control supply voltage typeAC
3RT1045-1AR10 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1045-1AR10 — 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
3RT1045-1AR10 — 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
3RT1045-1AR10 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1045-1AR10 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1045-1AR10 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth139 mm
3RT1045-1AR10 — Specifications
ParameterValue
At AC10 ... 25 ms

Product details

SIRIUS S3 power contactor for motor loads

The Siemens 3RT1045-1AR10 is a SIRIUS S3 power contactor rated 37 kW at 400 V AC-3 duty, meaning it switches three-phase induction motors up to that load in a standard control panel.

Rated for 1,000 switching operations per hour at AC-3. Operates between -25 °C and +60 °C, with storage down to -55 °C — suitable for unheated plant rooms or outdoor enclosures in temperate climates. IP20 on the front with cover or box terminal; the terminal body itself is IP00, so the contactor needs enclosure protection against dust and accidental contact in the panel. Pollution degree 3 rating means it tolerates conductive dust and humidity typical of industrial control cabinets without conformal coating.

RoHS compliance dated 01.05.2012.

Frequently asked questions

What wire sizes fit the screw terminals on 3RT1045-1AR10?

Main circuit terminals accept stranded cable from 10 mm² up to 50 mm²; auxiliary and coil terminals accept solid wire 0.5–1.5 mm² or stranded 0.75–2.5 mm².

Does 3RT1045-1AR10 mount on standard DIN rail?

Yes, it snaps onto 35 mm and 75 mm standard mounting rail, and side-by-side mounting is permitted without derating.

MPN
3RT1045-1AR10