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Siemens 3RT2337-3XB40-0LA2 — Contactors

Siemens 3RT2337-3XB40-0LA2 SIRIUS Power Contactor

MPN3RT2337-3XB40-0LA2

Siemens SIRIUS 3RT2337-3XB40-0LA2 power contactor, S2 frame size, 24 VDC coil, spring-type terminals, 18...1 main contacts, 130 mm depth, 75 mm width, 114 mm height.

Siemens 3RT2337-3XB40-0LA2 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2337-3XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS2
3RT2337-3XB40-0LA2 — 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 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2337-3XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2337-3XB40-0LA2 — Contacts & Poles
ParameterValue
Main poles4
Main NO contacts4
3RT2337-3XB40-0LA2 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 160A (690V,100kA)
Short-circuit coordination type 2, fusegG: 80 A (690 V,100 kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2337-3XB40-0LA2 — 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
3RT2337-3XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2337-3XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2337-3XB40-0LA2 — Mechanical
ParameterValue
Width75 mm
Height114 mm
Depth130 mm

Product details

DC switching capability and coil drive

The 3RT2337-3XB40-0LA2: Arcing time runs 10... 20 ms, and the DC operating time (closing + opening) is 30... 55 ms — the opening arc extinguishes faster than the closing bounce, which matters for contact erosion in DC switching where the arc does not self-extinguish at current zero.

Operating temperature range is -40... +70 °C during operation and -55... +80 °C during storage — the wide span covers unheated warehouses and outdoor cabinet installations in temperate climates.

Switching duty and auxiliary contacts

The main contact configuration is listed as 18... 1 — this is a 3-pole contactor with one normally open auxiliary contact integrated (the 18... 1 notation indicates the auxiliary contact set). Maximum switching frequency in AC-4 duty (plugging/inching) is 200 operations per hour — above that rate the contactor needs a larger frame or forced cooling to avoid thermal overload.

MPN
3RT2337-3XB40-0LA2