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Siemens 3RT1026-3KB44-0LA0 — Contactors

3RT1026-3KB44-0LA0 SIRIUS S0 power contactor, 24 VDC, screw

MPN3RT1026-3KB44-0LA0

Siemens SIRIUS S0 power contactor, 3RT1026-3KB44-0LA0, 24 VDC coil, screw-type main terminals, spring-loaded auxiliary terminals, 11 kW at 400 V AC-3.

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

3RT1026-3KB44-0LA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT1026-3KB44-0LA0 — 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
3RT1026-3KB44-0LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1026-3KB44-0LA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1026-3KB44-0LA0 — 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
3RT1026-3KB44-0LA0 — 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 (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 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
3RT1026-3KB44-0LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1026-3KB44-0LA0 — Environmental
ParameterValue
Installation altitude, max.2 000 m
3RT1026-3KB44-0LA0 — Mechanical
ParameterValue
Width70 mm
Height88 mm
Depth153 mm

Product details

The Siemens SIRIUS 3RT1026-3KB44-0LA0 is a size S0 power contactor rated for 11 kW at 400 V in AC-3 duty, making it a fit for switching three-phase motor loads up to that power level on standard 400 V networks. The 24 VDC coil draws 23 W on pickup and holds at 7 W, which matters for DC-supply sizing in a panel — the inrush isn't trivial, so factor it into your 24 V bus budget.

Terminals and wiring

Main power circuit lands on screw-type terminals accepting 2x (1... 2.5 mm²), 2x (2.5... 6 mm²), or max. 2x 10 mm² stranded — covers common motor cable sizes up to about 8 AWG. The auxiliary and control circuit uses spring-loaded terminals rated for 2x (0.25... 2.5 mm²) solid or 2x (24... 14) AWG. That split (screw for power, spring for control) is a practical choice: power wires get a positive clamp you can torque, control wires snap in fast during commissioning.

IP20 on the front, IP00 at the terminals — keep live parts behind a panel door or cover.

That's the spec to hand your panel-builder when they size the branch circuit. The built-in varistor surge suppressor clips coil-induced spikes — no external snubber needed on the 24 VDC control line.

Frequently asked questions

What is the closest functional second-source to 3RT1026-3KB44-0LA0?

The closest functional peer is the 3RT1026-1AB00, which shares the same S0 frame size and AC-3 power rating but uses screw-type terminals for both main and auxiliary circuits instead of the spring-loaded aux terminals on this variant. The 3RT1026-3KB44-0LA0 also includes a built-in varistor surge suppressor; the -1AB00 does not. Panel fit (footprint, DIN-rail mounting, side-by-side spacing) is identical, so a swap is possible if you account for the terminal style and external snubber.

Where can I buy 3RT1026-3KB44-0LA0?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What compliance documentation does Siemens provide for 3RT1026-3KB44-0LA0?

The part carries a substance prohibition date of 01.07.2006, indicating RoHS compliance per the EU directive. As a SIRIUS-series contactor, Siemens typically provides CE, UL, CSA, and IEC declarations on request through their documentation portal. The reference code per IEC 81346-2 is Q.

MPN
3RT1026-3KB44-0LA0