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Siemens 3RT1045-1AC24 — Contactors

Siemens 3RT1045-1AC24 SIRIUS Power Contactor, 45 kW at 500 V

MPN3RT1045-1AC24

Siemens SIRIUS power contactor, size S3, 3RT1045-1AC24, 45 kW at 500 V, 24 V 50/60 Hz coil, screw terminals, snap-on DIN 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

3RT1045-1AC24 — Identification
ParameterValue
Contactor frame sizeS3
3RT1045-1AC24 — 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
3RT1045-1AC24 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz24 V
3RT1045-1AC24 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1045-1AC24 — 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
3RT1045-1AC24 — 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
3RT1045-1AC24 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1045-1AC24 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1045-1AC24 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth188 mm
3RT1045-1AC24 — Specifications
ParameterValue
At AC10 ... 25 ms

Product details

The Siemens 3RT1045-1AC24 is a SIRIUS power contactor in size S3, rated to switch motor loads up to 45 kW at 500 V and 21.1 kW at 690 V — that's the AC-3 duty rating, meaning it handles the inrush and breaking of squirrel-cage motors within those power bands.

Main circuit connections are screw-type terminals; the wiring ranges accept solid conductors 2x (0.5 to 4 mm²) and stranded up to 2x (50 mm²), covering typical motor feeder sizes.

Front-side protection is IP20 with the cover or box terminal fitted; the terminal body itself is IP00 — standard for panel-mounted contactors where the enclosure provides the environmental seal.

Switching performance and ratings

Maximum switching frequency varies by duty: 1000 operations per hour in AC-3 (motor starting), 900 in AC-1 (resistive), 400 in AC-2 (slip-ring motor), and 300 in AC-4 (plugging/inching).

Frequently asked questions

What are the key ratings for this contactor?

It is a size S3 power contactor rated 45 kW at 500 V and 21.1 kW at 690 V in AC-3 duty. The coil is 24 V 50/60 Hz. Maximum switching frequency in AC-3 is 1000 operations per hour.

Does it mount on standard DIN rail?

Yes, it mounts via screw or snap-on onto 35 mm and 75 mm standard mounting rails.

MPN
3RT1045-1AC24