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Siemens 3RT1025-1DB44 — Contactors

Siemens 3RT1025-1DB44 SIRIUS Power Contactor, 24 V DC, Size

MPN3RT1025-1DB44

Siemens SIRIUS power contactor, 3RT1025-1DB44, Size S0, 24 V DC coil, screw-type terminals, IP20 front, 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

3RT1025-1DB44 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-1DB44 — 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
3RT1025-1DB44 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-1DB44 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-1DB44 — 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
3RT1025-1DB44 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control 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, solid or stranded2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 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 standard mounting rail according to DIN EN 50022
Side-by-side mountingYes
3RT1025-1DB44 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1025-1DB44 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Installation altitude, max.2 000 m
3RT1025-1DB44 — Mechanical
ParameterValue
Width45 mm
Height88 mm
Depth150 mm

Product details

SIRIUS power contactor, 24 V DC coil, Size S0 frame

Side-by-side mounting is allowed, which saves rail space in dense cabinets. Rated operational current in AC-3 duty at 400 V is 7.5 kW — that's the motor-switching figure to use for sizing. For AC-4 (plugging / inching) at 400 V the contactor is rated 15.5 A. The coil picks up at 0.8 × rated voltage and drops out at 1.1 × rated voltage, so a 24 V supply that sags below about 19.2 V will cause chatter or dropout.

Main current circuit uses screw-type terminals accepting 2x (1... 2.5 mm²) solid/stranded, 2x (2.5... 6 mm²), or max. 2x 10 mm². Auxiliary and control circuit terminals accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or max. 2x (0.75... 4 mm²). AWG equivalents for main: 2x (16... 12), 2x (14... 10), 1x 8. For aux: 2x (20... 16), 2x (18... 14), 1x 12. The contactor ships with a built-in varistor surge suppressor across the coil — no external diode or RC snubber needed for DC switching. Pollution degree 3 (conductive pollution, typical for industrial enclosures without climate control).

Fault coordination and protection

The contactor itself is rated for 10 million mechanical operations typical.

Frequently asked questions

What is the coil voltage and power draw for 3RT1025-1DB44?

The coil is rated 24 V DC and draws 5.4 W during both closing and holding.

What fuse rating is required for Type 2 coordination on this contactor?

For Type 2 coordination, use a gL/gG fuse rated 25 A upstream.

Where can I buy 3RT1025-1DB44?

This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.

MPN
3RT1025-1DB44