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Siemens 3RT2045-3XF40-0LA2 — Contactors

Siemens 3RT2045-3XF40-0LA2 SIRIUS Power Contactor, 480V 77A,

MPN3RT2045-3XF40-0LA2
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Siemens SIRIUS, Size S3 power contactor, 3RT2045-3XF40-0LA2, DC coil 110 V, spring-type terminals, 77 A at 480 V, 62 A at 600 V.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2045-3XF40-0LA2 — Identification
ParameterValue
Contactor frame sizeS3
3RT2045-3XF40-0LA2 — 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
3RT2045-3XF40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2045-3XF40-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2045-3XF40-0LA2 — 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)
3RT2045-3XF40-0LA2 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
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
3RT2045-3XF40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2045-3XF40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2045-3XF40-0LA2 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm

Product details

It switches motor loads up to 77 A at 480 V and 62 A at 600 V, making it suitable for medium-horsepower induction motors in a 480 V or 600 V distribution system. The spring-type terminals on the coil speed up panel wiring — no screw torque to verify, just strip and push.

The 70 mm width and 140 mm height fit a standard S3 footprint; the 152 mm depth means it will project past the DIN rail — account for that in enclosure depth when laying out the backplane.

Operating conditions and ratings

The DC coil draws a 1.5 A inrush peak, then holds at the rated 110 VDC — important for sizing the control transformer and verifying the DC supply can deliver the surge without dropout. Arcing time is 10 to 20 ms; the DC coil dropout time is 38 to 57 ms — sequence this with downstream devices so the main contacts clear before any interlocking relay releases.

Frequently asked questions

Where can I buy 3RT2045-3XF40-0LA2?

Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time.

What are the key ratings for 3RT2045-3XF40-0LA2?

Size S3 power contactor with a 110 VDC coil. Rated 77 A at 480 V and 62 A at 600 V. Spring-type terminals on the coil. Operating temperature range -40 °C to +70 °C.

Will 3RT2045-3XF40-0LA2 drop into a panel specified for 3RT5046-1AF00?

The 3RT5046-1AF00 is a different frame size (S6 vs S3) with different mounting dimensions and current ratings. The 3RT2045-3XF40-0LA2 will not mechanically or electrically substitute without panel rework.

MPN
3RT2045-3XF40-0LA2