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Siemens 3RT2045-1AL20 — Contactors

Siemens 3RT2045-1AL20 SIRIUS Power Contactor, S3 Size, 152 m

MPN3RT2045-1AL20
Active

Siemens SIRIUS, power contactor, S3 size, 3RT2045-1AL20, screw-type terminals, 152 mm depth, 70 mm width, 140 mm height, screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715.

Siemens 3RT2045-1AL20 datasheet (PDF)
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

3RT2045-1AL20 — Identification
ParameterValue
Contactor frame sizeS3
3RT2045-1AL20 — 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
3RT2045-1AL20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.35
Rated value @ 50 Hz230 V
3RT2045-1AL20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2045-1AL20 — 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)
3RT2045-1AL20 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2.5 ... 16 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2045-1AL20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2045-1AL20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2045-1AL20 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm
3RT2045-1AL20 — Specifications
ParameterValue
At AC10 ... 21 ms

Product details

SIRIUS S3 Power Contactor — Panel Integration Notes

Dimensions are 152 mm deep, 70 mm wide, 140 mm tall. The solid conductor range is 2.5 to 16 mm²; stranded accepts 6 to 70 mm². Auxiliary switch is included, so no separate add-on block is needed for basic status feedback.

Operating Conditions and Clearances

These matter when packing multiple contactors in a row — crowding the air gap reduces heat dissipation and can shorten coil life.

Switching Duty Ratings

Rated for AC-3 maximum 1,000 operating cycles per hour and AC-3e maximum 1,000 cycles per hour, with AC-1 at 900, AC-2 at 400, and AC-4 at 300 cycles per hour. The AC-3 figure governs motor switching duty — the contactor can handle frequent starts and stops on squirrel-cage motors at that rate without overheating. Arcing time is 10 to 20 ms; closing time at AC is 10 to 21 ms.

Frequently asked questions

What are the key dimensions of 3RT2045-1AL20?

Depth is 152 mm, width is 70 mm, height is 140 mm. It mounts on 35 mm DIN rail per DIN EN 60715.

What wire sizes does 3RT2045-1AL20 accept?

Solid conductor range is 2.5 to 16 mm²; stranded accepts 6 to 70 mm².

MPN
3RT2045-1AL20