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Siemens 3RT1025-1XB44-0LA2 — Contactors

Siemens 3RT1025-1XB44-0LA2 SIRIUS Power Contactor, 24 V DC,

MPN3RT1025-1XB44-0LA2

Siemens SIRIUS power contactor, 3RT1025-1XB44-0LA2, S0 size, 24 V DC coil, screw terminals, 45 mm width, 11 kW at 690 V AC.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT1025-1XB44-0LA2 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-1XB44-0LA2 — Ratings & Performance
ParameterValue
Rated operational current, AC-4 @ 400 V15.5 A
Rated value @ 400 V3 A
Rated value @ 500 V10 kW
Rated value @ 690 V11 kW
Rated value @ 230 V3 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1025-1XB44-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-1XB44-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-1XB44-0LA2 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 63 A
Short-circuit coordination type 2, fusefuse gL/gG: 25 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1025-1XB44-0LA2 — Connection & Mounting
ParameterValue
Main 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, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Side-by-side mountingYes
3RT1025-1XB44-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1025-1XB44-0LA2 — Mechanical
ParameterValue
Width45 mm
Height116 mm
Depth150 mm

Product details

It carries a 24 V DC coil and is rated for 11 kW at 690 V AC (AC-3 duty), meaning it can handle three-phase motors up to that power level in standard starting applications.

The 24 V DC coil pulls 10 A at the rated voltage, which is the inrush holding current you need to budget for in your 24 VDC supply. For DC switching, the contactor handles 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are the resistive DC current limits; derate further for inductive DC loads. On the AC side, the motor ratings span from 3 hp at 230 V to 15 hp at 575/600 V, and 11 kW at 690 V. The AC-4 rating at 400 V is 15.5 A — that's the reversing or inching duty current, which is lower than the AC-3 rating because of the higher switching frequency and electrical wear. The impulse withstand voltage is 6 kV, which covers standard industrial surge environments.

The S0 frame is 45 mm wide, 116 mm tall, and 150 mm deep, so it fits a standard 45 mm slot on the rail. Side-by-side mounting is permitted with zero clearance between units, which saves rail space in dense panels. Clearance to grounded parts: 10 mm upwards, forwards, downwards, and to the sides — plan your gland plate and wireway accordingly. The main circuit uses screw-type terminals accepting 2x 1–2.5 mm², 2x 2.5–6 mm², or max 2x 10 mm² stranded. The coil/auxiliary terminals accept 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or max 2x 0.75–4 mm² solid. IP20 on the front, IP00 at the terminals — so the terminal area needs finger-safe covers or enclosure protection in the final panel.

Frequently asked questions

What compliance documentation is available for this contactor?

As a current-production Siemens SIRIUS catalog item, RoHS, REACH, UL, and IEC declarations are available from the manufacturer on request.

MPN
3RT1025-1XB44-0LA2