Skip to main content
Log in
Siemens 3RT1025-3AL20 — Contactors

Siemens 3RT1025-3AL20 SIRIUS Power Contactor, 45 mm, 7.5 kW

MPN3RT1025-3AL20

Siemens SIRIUS power contactor, size S0, 3RT1025-3AL20, 45 mm width, screw terminals, 7.5 kW at 400 V AC-2, 35 mm 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

3RT1025-3AL20 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-3AL20 — 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
3RT1025-3AL20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz230 V
3RT1025-3AL20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-3AL20 — 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
3RT1025-3AL20 — 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
3RT1025-3AL20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1025-3AL20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1025-3AL20 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth90 mm

Product details

Panel builders can land screw-type terminals on the main circuit — accepts 2x (0.25...2.5 mm²) solid or up to 2x 10 mm² stranded, with AWG equivalents 2x (16...12) or 1x 8.

Motor duty and coordination

In AC-2 duty (slip-ring motors, wound-rotor) at 400 V, the contactor switches 7.5 kW. For AC-4 (plugging, inching) the same voltage yields 15.5 A. The S0 frame keeps the width at 45 mm — fits standard panel layouts without crowding. Type 2 coordination requires a 25 A gL/gG fuse; Type 1 allows 63 A. Pollution degree 3 suits industrial environments with conductive deposits.

The built-in auxiliary contact block handles 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for PLC inputs or small relays. At 220 V DC the rating drops to 0.3 A, so confirm DC load current before wiring.

Frequently asked questions

Where can I buy 3RT1025-3AL20 and how do I get a price?

This part is sourced and quoted to order against an RFQ. Send your quantity and target price — we confirm availability and current pricing at quote time.

Will 3RT1025-3AL20 drop into a panel that was specified around 3RT1023-1AL20 without rewiring?

The 3RT1025-3AL20 shares the same S0 frame (45 mm width) and DIN-rail mounting as the 3RT1023-1AL20, but verify the auxiliary contact configuration and coil voltage — the 3RT1025-3AL20 carries a 10 A rated auxiliary contact at 24 V, which may differ from the 3RT1023-1AL20's auxiliary rating.

What is 3RT1025-3AL20's listed depth (90 mm) on this component line?

The depth is 90 mm.

What is 3RT1025-3AL20's listed solid (2x (0.25... 2.5 mm²)) on this component line?

The solid conductor capacity is 2x (0.25... 2.5 mm²).

MPN
3RT1025-3AL20