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Siemens 3RT1025-3KB44-1LA0 — Contactors

Siemens 3RT1025-3KB44-1LA0 SIRIUS Power Contactor, 24 V DC,

MPN3RT1025-3KB44-1LA0

Siemens SIRIUS, power contactor, 3RT1025-3KB44-1LA0, size S0, 24 V DC coil with varistor, screw-type main terminals, spring-loaded auxiliary terminals, IP20 front / IP00 terminal protection.

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

3RT1025-3KB44-1LA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-3KB44-1LA0 — 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 V10 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
3RT1025-3KB44-1LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-3KB44-1LA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-3KB44-1LA0 — 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
3RT1025-3KB44-1LA0 — 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
3RT1025-3KB44-1LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1025-3KB44-1LA0 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Installation altitude, max.2 000 m
3RT1025-3KB44-1LA0 — Mechanical
ParameterValue
Width70 mm
Height88 mm
Depth153 mm

Product details

SIRIUS S0 power contactor — 24 V DC coil, varistor suppressed

Rated for AC-2 duty at 400 V at 7.5 kW and AC-4 at 400 V at 15.5 A, this contactor handles motor switching with moderate inrush and reversing loads. Coil draw is 23 W closing, 7 W holding — a standard DC coil curve that keeps the control transformer sized for the inrush. The varistor clamps the turn-off spike, protecting downstream PLC outputs.

This lets the panel builder size the branch protection to match the required coordination class without guesswork.

Dimensions: 88 mm height, 70 mm width, 153 mm depth.

RoHS compliance is documented with a substance prohibitance date of 01.07.2006, covering the EU RoHS directive.

Frequently asked questions

What is the closest functional second-source for 3RT1025-3KB44-1LA0?

The closest functional peer is the 3RT1016-1BB42, which is a smaller S00 frame size. The 3RT1025-3KB44-1LA0 is an S0 frame with higher AC-2 and AC-4 ratings, so a drop-in replacement without rewiring is not guaranteed — verify the mounting footprint and terminal layout before substituting.

What is the depth of 3RT1025-3KB44-1LA0?

The depth is 153 mm. This is the dimension that determines clearance in shallow enclosures — measure the gland plate depth before committing the panel layout.

What compliance documentation does this contactor carry?

RoHS compliance is documented with a substance prohibitance date of 01.07.2006. The product carries the reference code Q per IEC 81346-2 for panel labelling. Full compliance documentation (declarations, certificates) is available upon request through the sourcing channel.

Where can I buy 3RT1025-3KB44-1LA0 and what is the lead time?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time and price.

MPN
3RT1025-3KB44-1LA0