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Siemens 3RT2045-3AP00 — Contactors

Siemens SIRIUS 3RT2045-3AP00 Power Contactor, S3, 77 A at 48

MPN3RT2045-3AP00
Active

Siemens SIRIUS S3 power contactor, 3RT2045-3AP00, 77 A at 480 V AC-3, spring-type coil terminals, screw and snap-on 35 mm DIN rail, 152 x 70 x 140 mm.

$137.16Ref. price · indicative, final on quote
Siemens 3RT2045-3AP00 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2045-3AP00 — Identification
ParameterValue
Contactor frame sizeS3
3RT2045-3AP00 — 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
3RT2045-3AP00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.38
Rated value @ 50 Hz230 V
3RT2045-3AP00 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2045-3AP00 — 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)
3RT2045-3AP00 — 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
3RT2045-3AP00 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2045-3AP00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2045-3AP00 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm
3RT2045-3AP00 — Specifications
ParameterValue
At AC10 ... 21 ms

Product details

SIRIUS S3 power contactor – 77 A motor switching at 480 V

The Siemens SIRIUS 3RT2045-3AP00 is a size S3 power contactor rated for 77 A at 480 V in AC-3 duty — the motor-switching curve that governs most three-phase induction motor loads up to that current. The spring-type coil terminals and screw-and-snap-on mounting to 35 mm DIN rail per DIN EN 60715 mean it drops into the same panel footprint as other S3 frame units, with the same 152 mm depth, 70 mm width, and 140 mm height. Operating range covers -25 to +60 °C, so it handles typical cabinet ambients without derating.

The S3 frame accepts main conductor cross-sections from 2.5 to 16 mm² solid or 6 to 70 mm² stranded, and auxiliary contacts are included.

Frequently asked questions

What are the key ratings for 3RT2045-3AP00?

The contactor is rated 77 A at 480 V AC-3 (motor duty), with a size S3 frame. Coil terminals are spring-type. Operating temperature range is -25 to +60 °C. Dimensions: 152 mm depth, 70 mm width, 140 mm height.

Where can I buy 3RT2045-3AP00?

The 3RT2045-3AP00 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
3RT2045-3AP00