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Siemens 3RT2025-1DB44-3MA0 — Contactors

Siemens 3RT2025-1DB44-3MA0 SIRIUS Power Contactor, Size S0,

MPN3RT2025-1DB44-3MA0
Active

Siemens SIRIUS power contactor, Size S0, 24 VDC coil, screw-type terminals, 45 mm width, 151 mm depth, 85 mm height.

$63.50Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT2025-1DB44-3MA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT2025-1DB44-3MA0 — 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 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2025-1DB44-3MA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2025-1DB44-3MA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2025-1DB44-3MA0 — 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)
3RT2025-1DB44-3MA0 — 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
3RT2025-1DB44-3MA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2025-1DB44-3MA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2025-1DB44-3MA0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth151 mm

Product details

It mounts onto 35 mm DIN rail per DIN EN 60715 using screw or snap-on fastening, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward and backward — useful when panel layout forces an unconventional orientation. The coil holds at 24 V nominal; the initial operating value is 0.8 of rated and the full-scale value is 1.1. Arcing time runs 10 to 10 ms, and the DC operating time is 15 to 18 ms.

Rated for 1 000 operations per hour in AC-1, AC-2, AC-3, and AC-3e duty, and 300 operations per hour in AC-4. DC switching capability is specified per voltage: 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. For motor loads on single-phase 230 V, the rating is 3 hp. These are the numbers that determine whether this contactor handles your DC brake coil or small DC motor without welding the contacts.

Wire Sizing and Clearances

Main contacts accept solid or stranded wire from 1 to 10 mm², and the auxiliary circuit (if you add one later) takes 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²).

Environmental and Mechanical Life

Frequently asked questions

What is 3RT2025-1DB44-3MA0's listed depth?

The depth is 151 mm, with a width of 45 mm and height of 85 mm, fitting the standard S0 contactor footprint.

What wire sizes does the main contact accept?

The main contacts accept solid or stranded wire from 1 to 10 mm².

MPN
3RT2025-1DB44-3MA0