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Siemens 3RT1034-3XB40-0LA2 — Contactors

Siemens 3RT1034-3XB40-0LA2 SIRIUS Power Contactor, S2, 18.5

MPN3RT1034-3XB40-0LA2

Siemens SIRIUS 3RT1034-3XB40-0LA2 power contactor, S2 frame size, screw-type terminals, 18.5 kW at 500 V AC-3, 15 kW at 400 V AC-2, 55 mm wide, 142 mm high, 130 mm deep.

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

3RT1034-3XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS2
3RT1034-3XB40-0LA2 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V29 A
Rated value @ 400 V3 A
Rated value @ 500 V18.5 kW
Rated value @ 690 V10 kW
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1034-3XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1034-3XB40-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT1034-3XB40-0LA2 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 125 A
Short-circuit coordination type 2, fusefuse gL/gG: 63 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1034-3XB40-0LA2 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, solid or stranded2x (0.75 ... 16 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Side-by-side mountingYes
3RT1034-3XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1034-3XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1034-3XB40-0LA2 — Mechanical
ParameterValue
Width55 mm
Height142 mm
Depth130 mm

Product details

The 3RT1034-3XB40-0LA2: Screw-type terminals on the main circuit accept stranded conductors up to 2x 25 mm² and solid up to 2x 2.5 mm², which covers the feed and motor cable for the full rated load without needing lug adapters. The auxiliary contact block is rated 10 A at 24 VDC, 6 A at 230 VAC, and 3 A at 400 VAC — enough for a PLC input or a holding-circuit interlock. Arcing time runs 10–15 ms, and DC operating time is 20–30 ms — both within the range for standard motor starter coordination.

Clearance requirements: 10 mm upwards, downwards, forwards, and to the side — standard for S2 frame spacing in a 55 mm wide footprint.

Frequently asked questions

What are the key power ratings for this contactor?

AC-3 motor switching: 18.5 kW at 500 V, 10 kW at 690 V. AC-2 duty: 15 kW at 400 V. AC-1 resistive load: consult the full spec table for current ratings at your voltage.

What wire sizes does the screw terminal accept?

Main circuit terminals accept stranded 2x (0.75–25 mm²) and solid 2x (0.25–2.5 mm²). Auxiliary contacts take 2x (0.75–16 mm²) stranded or solid.

What clearance is needed around this contactor in a panel?

10 mm upwards, downwards, forwards, and to the side. Side-by-side mounting is allowed, so multiple units can be ganged without additional spacing.

How do I source this part?

Submit an RFQ through the distributor. As an active-production part, it is quoted to order with standard Siemens lead times.

MPN
3RT1034-3XB40-0LA2