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Siemens 3RT1034-1XB40-1LA4 — Contactors

Siemens SIRIUS 3RT1034-1XB40-1LA4 Power Contactor, S2, 29 A

MPN3RT1034-1XB40-1LA4

Siemens SIRIUS, power contactor, size S2, 3RT1034-1XB40-1LA4, 29 A AC-4 at 400 V, 18.5 kW at 500 V, screw-type terminals, IP20 front, IP00 terminal, snap-on 35 mm DIN rail.

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

3RT1034-1XB40-1LA4 — Identification
ParameterValue
Contactor frame sizeS2
3RT1034-1XB40-1LA4 — 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
3RT1034-1XB40-1LA4 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1034-1XB40-1LA4 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1034-1XB40-1LA4 — 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
3RT1034-1XB40-1LA4 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)
Conductor cross-section, solid or stranded2x (0.75 ... 16 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 standard mounting rail according to DIN EN 50022
Side-by-side mountingYes
3RT1034-1XB40-1LA4 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1034-1XB40-1LA4 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1034-1XB40-1LA4 — Mechanical
ParameterValue
Width55 mm
Height142 mm
Depth130 mm

Product details

Siemens SIRIUS 3RT1034-1XB40-1LA4 — S2 Power Contactor, AC-4 Rated 29 A

Its 29 A rating in AC-4 duty at 400 V means it handles the severe inrush and plugging/ reversing cycles typical of crane, hoist, and press drives — not just steady-state running. The 18.5 kW rating at 500 V and 10 kW at 690 V cover the motor power range for a 400 V class machine.

The main current circuit uses screw-type terminals; solid wire capacity is 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded wire accepts 2x (0.75 to 25 mm²).

Duty Cycles and Life

Switching frequency varies by duty: 1 200 cycles/hour in AC-1 (resistive), 1 000 in AC-3 (motor running), 750 in AC-2 (slip-ring motor), and 250 in AC-4 (plugging/reversing).

Frequently asked questions

What is 3RT1034-1XB40-1LA4's listed depth?

The depth is 130 mm.

What solid wire sizes does the 3RT1034-1XB40-1LA4 accept?

Solid wire capacity is 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²).

Will 3RT1034-1XB40-1LA4 drop into a panel specified around 3RT1044-1FB46 without rewiring?

The 3RT1034-1XB40-1LA4 is a size S2 contactor; the 3RT1044-1FB46 is a different frame size and rating class, so a direct drop-in without checking the mounting footprint and terminal spacing is not assured. Compare the physical dimensions and terminal layout before assuming interchangeability.

MPN
3RT1034-1XB40-1LA4