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Siemens 3RT1026-1BB44-3MA0 — Contactors

Siemens 3RT1026-1BB44-3MA0 SIRIUS S0 Power Contactor, 24 VDC

MPN3RT1026-1BB44-3MA0

Siemens SIRIUS S0 power contactor, 3RT1026-1BB44-3MA0, 24 VDC coil, screw-type terminals, 11 kW at 400 V AC-2, 45 mm width, IP20 front.

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

3RT1026-1BB44-3MA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT1026-1BB44-3MA0 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V15.5 A
Rated value @ 400 V3 A
Rated value @ 500 V11 kW
Rated value @ 690 V11 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
3RT1026-1BB44-3MA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1026-1BB44-3MA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1026-1BB44-3MA0 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 100 A
Short-circuit coordination type 2, fusefuse gL/gG: 35 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1026-1BB44-3MA0 — 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 (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 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
3RT1026-1BB44-3MA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1026-1BB44-3MA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Installation altitude, max.2 000 m
3RT1026-1BB44-3MA0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth150 mm

Product details

The Siemens 3RT1026-1BB44-3MA0 is a SIRIUS S0-frame power contactor with a 24 VDC magnet coil, rated for motor switching at 11 kW in AC-2 duty at 400 V and 15.5 A in AC-4 at 400 V. The coil draws 5.4 W both closing and holding, so the control transformer sizing is straightforward — no inrush spike to over-spec for.

Side-by-side mounting is permitted, which keeps multi-contactor motor starter assemblies tight on the rail.

Short-Circuit Coordination and Wiring

For Type 2 coordination (minimal damage to the contactor after a fault), Siemens specifies a gL/gG fuse rated 35 A. Main circuit terminals accept solid or stranded copper: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm². Auxiliary terminals take 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²), max 2x 4 mm². AWG equivalents are listed for both.

Frequently asked questions

What is the closest functional alternative to 3RT1026-1BB44-3MA0?

The 3RT1026-1AB00 shares the same S0 frame and 11 kW AC-2 rating, but uses an AC coil instead of the 24 VDC coil on this variant. If your control voltage is fixed at 24 VDC, the 1AB00 will not drop in without a coil voltage change.

MPN
3RT1026-1BB44-3MA0