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Siemens 3RT1046-3XB40-0LA2 — Contactors

Siemens 3RT1046-3XB40-0LA2 SIRIUS Power Contactor, 55 kW at

MPN3RT1046-3XB40-0LA2

Siemens SIRIUS power contactor, size S3, 55 kW at 500 V AC-3, 24 V DC coil, screw terminals, 70 x 176 x 152 mm.

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

3RT1046-3XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS3
3RT1046-3XB40-0LA2 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V80 A
Rated value @ 400 V3 A
Rated value @ 500 V55 kW
Rated value @ 690 V25.4 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
3RT1046-3XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1046-3XB40-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT1046-3XB40-0LA2 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 250 A
Short-circuit coordination type 2, fusefuse gL/gG: 160 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1046-3XB40-0LA2 — 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 (2.5 ... 16 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm and 75 mm standard mounting rail
Side-by-side mountingYes
3RT1046-3XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1046-3XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1046-3XB40-0LA2 — Mechanical
ParameterValue
Width70 mm
Height176 mm
Depth152 mm

Product details

It is rated for 55 kW at 500 V and 25.4 kW at 690 V under AC-3 duty, meaning it handles the high inrush of induction motors up to those power levels without welding contacts.

Side-by-side mounting is allowed with no derating gap, which saves rail space in dense layouts.

Coil is 24 V DC rated, with a pickup dropout range typical for SIRIUS contactors — holds at 24 V nominal, drops out below 18 V. The DC coil draws 10 A at 24 V rated value, 2 A at 60 V, and 0.3 A at 220 V, so verify your control transformer sizing for the inrush.

Frequently asked questions

What is the closest functional second-source — 3RT1044-1FB46?

The 3RT1044-1FB46 is a smaller frame size (S2) with lower current ratings. It will not drop into a panel wired for the S3 footprint without re-drilling the mounting holes and checking the lug size — the 3RT1046-3XB40-0LA2 uses screw terminals up to 50 mm², while the S2 typically handles smaller conductors.

What is the listed depth on this component line?

Depth is 152 mm.

What is the listed solid conductor size?

Solid conductors: 2x (0.25... 2.5 mm²).

Will 3RT1046-3XB40-0LA2 drop into a panel specified around 3RT1044-1FB46 without rewiring?

No — the 3RT1044-1FB46 is a size S2 contactor with different mounting dimensions and smaller terminal capacity. The 3RT1046-3XB40-0LA2 is size S3, 70 mm wide vs the S2's narrower footprint, so you would need to re-drill the DIN rail or panel holes and possibly upsize the lugs.

MPN
3RT1046-3XB40-0LA2