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Siemens 3RT2025-2AC20 — Contactors

Siemens 3RT2025-2AC20 SIRIUS S0 Power Contactor, 45 mm wide

MPN3RT2025-2AC20
Active

Siemens SIRIUS S0 power contactor, 3RT2025-2AC20, 45 mm width, 97 mm depth, spring-type coil terminals, screw and snap-on 35 mm DIN rail mount, current lifecycle.

$29.21Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT2025-2AC20 — Identification
ParameterValue
Contactor frame sizeS0
3RT2025-2AC20 — 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
3RT2025-2AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz24 V
3RT2025-2AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2025-2AC20 — 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)
3RT2025-2AC20 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid1 ... 10 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2025-2AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2025-2AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2025-2AC20 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth97 mm
3RT2025-2AC20 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

The contactor is in current lifecycle stage — still an active catalog line, not phased out. Spring-type terminals on the magnet coil speed up wiring: accept solid or stranded conductors from 1 to 10 mm², and 2x (0.5... 2.5 mm²) for the auxiliary circuit.

Switching ratings — what the duty classes mean for your load

Rated for AC-1, AC-2, AC-3, and AC-3e duty up to 1 000 switching cycles per hour, and AC-4 at 300 cycles per hour. AC-3 covers standard squirrel-cage motor starting and stopping; the 1 000 cycles/h rating means it handles frequent jogging or inching without overheating. AC-4 (plugging/reversing) at 300 cycles/h reflects the higher electrical stress from counter-current braking. Auxiliary switch included as standard — 18... 8 AWG for main contacts, with switching capacity at 24 V rated 10 A, 230 V rated 3 hp, and 400 V rated 3 A. The 10 ms arcing time is consistent across the range.

Panel integration — mounting and clearances

Minimum clearances: 10 mm upwards, downwards, and forwards; 6 mm at the side. This gives the panel builder room to route cables and maintain airflow.

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Frequently asked questions

What is the closest functional second-source to 3RT2025-2AC20?

The peer 3RT2025-1AD20-1AA0 shares the same S0 frame and SIRIUS platform but uses screw-type coil terminals instead of spring-type. Panel fit is identical — same DIN footprint, same clearances. The swap decision is purely terminal preference.

What is the listed depth of 3RT2025-2AC20?

97 mm. Combined with the 45 mm width and 102 mm height, it fits a standard S0 contactor cutout.

What wire sizes does the spring terminal accept?

Solid or stranded conductors from 1 to 10 mm² for the main circuit, and 2x (0.5... 2.5 mm²) for auxiliary contacts.

Will 3RT2025-2AC20 drop into a panel spec'd for 3RT2025-1AD20-1AA0 without rewiring?

Mechanically yes — same S0 frame, same DIN-rail mount, same overall dimensions. The only difference is the coil terminal type: spring-cage here vs screw-type on the -1AD20. If the panel wiring already has ferrules or bare wire for a screw clamp, you may need to change the termination method or use a pin ferrule for the spring cage.

MPN
3RT2025-2AC20