Skip to main content
Log in
Siemens 3RT1034-3BM40 — Contactors

Siemens 3RT1034-3BM40 SIRIUS Power Contactor, 18.5 kW at 500

MPN3RT1034-3BM40

Siemens SIRIUS 3RT1034-3BM40, size S2 power contactor, 18.5 kW at 500 V AC-3, screw-type terminals, 55 mm wide, DIN rail mount.

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

3RT1034-3BM40 — Identification
ParameterValue
Contactor frame sizeS2
3RT1034-3BM40 — 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
3RT1034-3BM40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1034-3BM40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1034-3BM40 — 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
3RT1034-3BM40 — 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
3RT1034-3BM40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1034-3BM40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1034-3BM40 — Mechanical
ParameterValue
Width55 mm
Height112 mm
Depth130 mm

Product details

What This SIRIUS S2 Contactor Does

Its AC-3 rating of 18.5 kW at 500 V means it handles standard squirrel-cage motors up to that power, and the 29 A AC-4 rating at 400 V covers reversing or inching duty where the contacts break full load current.

The 18.5 kW motor rating at 500 V is the headline number, but the 10 kW at 690 V rating matters for systems running on higher supply voltages — it's not a simple linear derate, so check your line voltage against that column.

The RoHS compliance date of May 1, 2012, confirms it meets the EU substance restrictions. CE marking is standard for the SIRIUS range, and the DIN rail mount per EN 50022 is a global standard, so it fits panels built to IEC or UL 508A practices.

Frequently asked questions

What is the closest second-source or alternative to the 3RT1034-3BM40?

The 3RT1034-1AN60-1AA0 is a peer in the same S2 frame size, but it uses spring-cage terminals instead of the screw-type terminals on this 3BM40. If your panel is wired for screw clamps, the 1AN60 variant would require re-terminating the power wiring. The 3RT1036-1AB00 is a larger S3 frame with higher current capacity, and the 3RT1044-1FB46 is a S6 frame for much bigger loads — neither is a direct drop-in for the S2 footprint.

What wire sizes does the 3RT1034-3BM40 accept?

The screw-type main circuit terminals accept solid wire from 0.25 to 2.5 mm² (two conductors) and stranded wire from 0.75 to 25 mm² (two conductors). At 40 °C ambient, the minimum permissible conductor size is 16 mm² for full rated current.

MPN
3RT1034-3BM40