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Siemens 3RT1045-1AH24 — Contactors

Siemens SIRIUS 3RT1045-1AH24 Power Contactor, 45 kW at 500 V

MPN3RT1045-1AH24

Siemens SIRIUS 3RT1045-1AH24 power contactor, size S3, screw-type terminals, 45 kW at 500 V AC-3, 21.1 kW at 690 V AC-3, IP20 front, snap-on 35 mm 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

3RT1045-1AH24 — Identification
ParameterValue
Contactor frame sizeS3
3RT1045-1AH24 — 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
3RT1045-1AH24 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz48 V
3RT1045-1AH24 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1045-1AH24 — 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
3RT1045-1AH24 — 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
3RT1045-1AH24 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1045-1AH24 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1045-1AH24 — Mechanical
ParameterValue
Width70 mm
Height146 mm
Depth188 mm
3RT1045-1AH24 — Specifications
ParameterValue
At AC10 ... 25 ms

Product details

The Siemens SIRIUS 3RT1045-1AH24 is a size S3 power contactor rated for motor switching: 45 kW at 500 V AC-3 and 21.1 kW at 690 V AC-3. IP20 on the front with the cover or box terminal installed keeps fingers out during panel access.

Terminal & Wiring Details

Main circuit screw terminals accept 2x (0.5–1.5 mm²) solid, 2x (0.75–2.5 mm²) solid, or up to 2x (0.75–4 mm²) solid maximum. Stranded conductors go up to 2x 50 mm². The auxiliary contact block (not included) uses separate smaller terminals.

Frequently asked questions

What are the key motor ratings for this contactor?

Rated 45 kW at 500 V AC-3 and 21.1 kW at 690 V AC-3. That AC-3 duty covers starting and stopping squirrel-cage motors under load.

Will the 3RT1045-1AH24 drop into a panel designed for a 3RT1036-1AB00?

No — the 3RT1045-1AH24 is a size S3 frame (146 mm high, 70 mm wide, 188 mm deep), while the 3RT1036-1AB00 is a smaller frame. Panel cutouts and busbar spacing differ; rewiring and re-drilling are required.

MPN
3RT1045-1AH24