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Siemens 3RT2025-1FB40 — Contactors

Siemens 3RT2025-1FB40 SIRIUS Power Contactor, 24 VDC Coil, S

MPN3RT2025-1FB40
Active

Siemens SIRIUS, Power contactor, 3RT2025-1FB40, S0 size, 24 V DC coil, screw-type terminals, 45 mm width.

$59.69Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT2025-1FB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2025-1FB40 — 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 V2 A
Rated value @ 690 V1 A
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
3RT2025-1FB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2025-1FB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2025-1FB40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 63A (690V,100kA), aM: 32A (690V,100kA), BS88: 63A (415V,80kA)
Short-circuit coordination type 2, fusegG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2025-1FB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid1 ... 10 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2025-1FB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2025-1FB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2025-1FB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

SIRIUS S0 power contactor, 24 V DC coil

The coil holds at 24 V nominal, with an initial value of 0.8 and a full-scale value of 1.1 — the pickup and dropout thresholds follow standard SIRIUS DC coil characteristics. Mechanical life is typical at 10,000,000 operations. Switching frequency maxes out at 1,000 cycles per hour for AC-1, AC-2, AC-3, and AC-3e duty, dropping to 300 cycles per hour for AC-4 — the heavy inching/jogging limit.

The 45 mm width (3 modules wide) fits standard enclosure gland plates. Depth is 107 mm, height 85 mm — account for that behind the door. Wire range accepts solid or stranded conductors from 1 to 10 mm² for the main circuit, and 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) for auxiliary contacts.

Frequently asked questions

What is the depth of 3RT2025-1FB40?

The depth is 107 mm, with a width of 45 mm and height of 85 mm.

What wire sizes does 3RT2025-1FB40 accept?

Solid or stranded conductors from 1 to 10 mm² for the main circuit; auxiliary terminals accept 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²).

Will 3RT2025-1FB40 drop into a panel built for 3RT2015-1BW42?

Both are S0 frame size contactors on 45 mm width, sharing the same DIN rail footprint and clearance requirements. Panel fit is identical — the difference is in coil voltage and auxiliary configuration, not physical dimensions.

MPN
3RT2025-1FB40