Skip to main content
Log in
Siemens 3RT2045-1XB40-0LA2 — Contactors

Siemens 3RT2045-1XB40-0LA2 SIRIUS Contactor, 77 A at 480 V

MPN3RT2045-1XB40-0LA2
Active

Siemens SIRIUS 3RT2045-1XB40-0LA2 power contactor, size S3, DC 24 V coil, screw-type terminals, 77 A at 480 V AC-3, 70 x 140 x 152 mm, DIN-rail mount.

Siemens 3RT2045-1XB40-0LA2 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

3RT2045-1XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS3
3RT2045-1XB40-0LA2 — 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
3RT2045-1XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2045-1XB40-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2045-1XB40-0LA2 — 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)
3RT2045-1XB40-0LA2 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
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
3RT2045-1XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2045-1XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2045-1XB40-0LA2 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm

Product details

DC coil performance and control circuit demands

The 3RT2045-1XB40-0LA2: The coil is DC 24 V with a 6.5 A inrush peak — the control supply must handle that surge without droop.

Motor load ratings by voltage

In AC-3 duty (squirrel-cage motor switching), the contactor is rated 77 A at 480 V and 62 A at 600 V — enough for a 15 hp motor at 230 V per the listed horsepower figure. These are the operating currents that determine whether the contactor coordinates with upstream overload relays and fuses for Type 2 coordination.

Frequently asked questions

What is the AC-3 current rating of 3RT2045-1XB40-0LA2 at 480 V?

77 A at 480 V AC-3, and 62 A at 600 V AC-3. These figures govern motor load sizing and coordination with upstream protection.

MPN
3RT2045-1XB40-0LA2