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Siemens 3RT2037-3XB44-0LA2 — Contactors

Siemens 3RT2037-3XB44-0LA2 SIRIUS Power Contactor, 24 VDC

MPN3RT2037-3XB44-0LA2
Active

Siemens SIRIUS power contactor, 3RT2037-3XB44-0LA2, S2 size, 24 VDC coil, spring-type terminals, 178 mm depth, 55 mm width, screw and snap-on mounting onto 35 mm DIN rail per EN 60715.

Siemens 3RT2037-3XB44-0LA2 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

3RT2037-3XB44-0LA2 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-3XB44-0LA2 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V55 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V10 hp
Rated value @ 24 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2037-3XB44-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2037-3XB44-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2037-3XB44-0LA2 — 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: 125A (690V,100kA), aM: 63A (690V,100kA), BS88: 100A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2037-3XB44-0LA2 — 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 standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2037-3XB44-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-3XB44-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-3XB44-0LA2 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth178 mm

Product details

Physical fit and DIN-rail integration

The 3RT2037-3XB44-0LA2: The contactor measures 178 mm deep by 55 mm wide by 114 mm high — the S2 frame size is the key envelope number for panel layout and gland-plate clearance.

Coil draw at 24 VDC — what the PLC output sees

The DC coil is rated 24 V nominal with an inrush current peak of 3 A and a holding current of 6 A at 24 V — the inrush is brief (30–55 ms) but the holding draw is steady, so size the PLC output or interposing relay for the 6 A continuous load.

MPN
3RT2037-3XB44-0LA2