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Siemens 3RT1025-1HB40 — Contactors

Siemens 3RT1025-1HB40 SIRIUS Power Contactor, 24 V DC Coil,

MPN3RT1025-1HB40

Siemens SIRIUS power contactor, 3RT1025-1HB40, S0 frame, 24 V DC coil, screw terminals, 45 mm wide, snap-on DIN rail mount.

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

3RT1025-1HB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-1HB40 — 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
3RT1025-1HB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-1HB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-1HB40 — 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
3RT1025-1HB40 — 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
3RT1025-1HB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
3RT1025-1HB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1025-1HB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth101 mm

Product details

It carries a 24 V DC coil with a holding power of 4.2 W, and its main contacts are rated for 7.5 kW at AC-2 duty at 400 V and 11 kW at AC-3 duty at 690 V.

The DC-13 rating at 24 V is 10 A — that's the inductive load switching capacity for solenoids and contactor coils, not resistive heating. For motor switching, the AC-3 rating at 400 V is 10 kW, and at 690 V it's 11 kW, so this contactor handles standard 3-phase induction motors up to about 15 HP at 400 V. Type 1 coordination requires a 63 A gL/gG fuse upstream; Type 2 coordination needs a 25 A gL/gG fuse. That's the short-circuit protection the contactor needs to survive a fault without welding its contacts — pick the coordination level your panel design calls for.

Side-by-side mounting is allowed with a 6 mm gap to the side for heat dissipation. The control circuit terminals take 0.5 to 4 mm².

Frequently asked questions

What is the depth of the 3RT1025-1HB40?

The depth is 101 mm, with a width of 45 mm and height of 85 mm.

What wire sizes does the 3RT1025-1HB40 accept on the main terminals?

The screw-type main terminals accept 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm² stranded, or 2x (16 to 12 AWG), 2x (14 to 10 AWG), or 1x 8 AWG.

Where can I buy the 3RT1025-1HB40?

This part is sourced to order through independent distribution. Submit an RFQ for current availability and pricing.

Will 3RT1025-1HB40 drop into a panel specified for 3RT1023-1AL20?

Both are S0 frame contactors on 35 mm DIN rail, so the footprint and mounting are identical. The difference is in the coil voltage and contact ratings — verify your control voltage and load current against the 3RT1025-1HB40's 24 V DC coil and its specific AC-3/AC-4 ratings before substituting.

MPN
3RT1025-1HB40