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Siemens 3RT2045-3AL20-1AA0 — Contactors

Siemens 3RT2045-3AL20-1AA0 SIRIUS Power Contactor, S3, 15 hp

MPN3RT2045-3AL20-1AA0
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Siemens SIRIUS, power contactor, 3RT2045-3AL20-1AA0, S3 size, 15 hp at 230 V, spring-type terminals, screw and snap-on DIN rail 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

3RT2045-3AL20-1AA0 — Identification
ParameterValue
Contactor frame sizeS3
3RT2045-3AL20-1AA0 — 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 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V15 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2045-3AL20-1AA0 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.35
Rated value @ 50 Hz230 V
3RT2045-3AL20-1AA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2045-3AL20-1AA0 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)
Short-circuit coordination type 2, fusegG: 160A (690V,100kA), aM: 80A (690V,100kA), BS88: 125A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2045-3AL20-1AA0 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2.5 ... 16 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2045-3AL20-1AA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2045-3AL20-1AA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2045-3AL20-1AA0 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm
3RT2045-3AL20-1AA0 — Specifications
ParameterValue
At AC10 ... 21 ms

Product details

Its compact footprint — 152 mm deep, 140 mm high, 70 mm wide — fits standard control-panel layouts without oversizing the enclosure. Spring-type terminals on the magnet coil accept solid conductors from 2.5 to 16 mm² and stranded from 6 to 70 mm², with auxiliary wiring handled by 2x (0.5 to 2.5 mm²) solid or stranded. The integrated auxiliary switch eliminates the need for a separate add-on block in many motor-starting circuits.

Duty-cycle and switching ratings

Rated for AC-1 resistive loads at 900 operating cycles per hour and AC-3 motor switching at 1,000 ops/h, with AC-3e matching that rate. AC-4 inching/jogging duty is capped at 300 ops/h — stay under that for plug-reversing or high-wear applications. For DC switching, the contactor carries 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.8 A at 440 V. At 230 V AC it is rated 15 hp — a common sizing point for 3-phase motor loads in North American panels.

Environmental limits and lifecycle

These matter for heat dissipation and arc-flash containment — don't crowd the contactor against cable ducts or other devices.

Frequently asked questions

What are the key ratings for the 3RT2045-3AL20-1AA0?

This S3-size power contactor is rated 15 hp at 230 V AC, handles AC-3 motor switching at 1,000 ops/h, and carries a mechanical life of 10 million operations. DC switching ranges from 10 A at 24 V down to 0.8 A at 440 V.

How do I get pricing and availability for the 3RT2045-3AL20-1AA0?

Submit an RFQ through this listing. Current pricing and availability are confirmed at quote time through our independent distribution network.

Does the 3RT2045-3AL20-1AA0 include an auxiliary contact?

Yes, it comes with an integrated auxiliary switch, so you don't need a separate add-on block for basic status feedback or interlocking.

MPN
3RT2045-3AL20-1AA0