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Siemens 3RT1025-3VB40 — Contactors

Siemens 3RT1025-3VB40 SIRIUS Power Contactor, 24 VDC, Size S

MPN3RT1025-3VB40

Siemens SIRIUS power contactor, 3RT1025-3VB40, Size S0, 24 VDC coil, screw-type terminals, 10 kW at 500 V, 11 kW at 690 V, 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

3RT1025-3VB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-3VB40 — 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 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1025-3VB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-3VB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-3VB40 — 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
3RT1025-3VB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Side-by-side mountingYes
3RT1025-3VB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
3RT1025-3VB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1025-3VB40 — Mechanical
ParameterValue
Width45 mm
Height88 mm
Depth100 mm

Product details

It carries a 24 VDC coil with integrated diode suppression, and its screw-type main terminals accept up to 2x 10 mm² conductors. The contactor is rated for 10 kW at 500 V and 11 kW at 690 V, with an AC-4 switching current of 15.5 A at 400 V — the rating that governs reversing or inching duty cycles.

Depth is 100 mm — account for that when routing wiring behind the panel door.

The built-in diode surge suppressor handles the inductive kickback — no external flyback diode needed across the coil terminals.

Frequently asked questions

Where can I buy 3RT1025-3VB40?

Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.

What is the depth of 3RT1025-3VB40?

The depth is 100 mm.

What solid conductor size does the main terminal accept?

The main screw terminals accept 2x (0.25... 2.5 mm²) solid conductors, and also 2x (1... 2.5 mm²) or 2x (2.5... 6 mm²) stranded, with a maximum of 2x 10 mm².

Will 3RT1025-3VB40 drop into a panel specified around 3RT1023-1AL20?

Both are Size S0 contactors on the same 45 mm DIN-rail footprint, so the mechanical fit is identical. The main difference is the coil voltage — 24 VDC here versus whatever the 3RT1023-1AL20 carries — so verify the control supply before substitution.

MPN
3RT1025-3VB40