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Siemens 3RT2027-2AC20 — Contactors

Siemens 3RT2027-2AC20 SIRIUS Power Contactor, Size S0, 45 mm

MPN3RT2027-2AC20
Active

Siemens SIRIUS power contactor, 3RT2027-2AC20, Size S0, 45 mm width, spring-type terminals, screw and snap-on 35 mm DIN rail mounting.

$54.61Ref. price · indicative, final on quote
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

3RT2027-2AC20 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-2AC20 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V22 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V5 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2027-2AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz24 V
3RT2027-2AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-2AC20 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)
Short-circuit coordination type 2, fusegG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2027-2AC20 — 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
3RT2027-2AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-2AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-2AC20 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth97 mm
3RT2027-2AC20 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

At 45 mm wide and 102 mm tall, it fits the standard DIN-rail footprint (screw and snap-on mounting per DIN EN 60715). The spring-type terminals on the magnet coil and main contacts accept solid or stranded wire from 1 to 10 mm², or two conductors of 0.5 to 2.5 mm² — a time-saver for panel builders who want to skip torque checks on screw clamps. The switching frequency tells you what duty cycle this contactor can sustain: 1,000 operations per hour at AC-1 (resistive loads), 750/h at AC-2 and AC-3 (slip-ring and squirrel-cage motors), and 250/h at AC-4 (plugging and inching). If your application needs frequent jogging or reversing, the AC-4 limit is the one to watch — exceeding it shortens contact life. The mounting position is flexible — ±180° rotation on a vertical surface and ±22.5° tilt — so it adapts to tight enclosures without derating, as long as the clearance distances are respected: 10 mm upwards, forwards, and downwards, and 6 mm at the sides.

Arcing time is 10 ms, which is typical for this size class and keeps arc-flash energy contained within the contactor housing.

Frequently asked questions

Where can I buy the 3RT2027-2AC20?

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

What are the key dimensions and mounting requirements?

Width 45 mm, height 102 mm, depth 97 mm. Mounts on 35 mm DIN rail per DIN EN 60715 with screw and snap-on fastening. Clearance: 10 mm upwards/forwards/downwards, 6 mm at sides.

What wire sizes does the spring terminal accept?

Solid or stranded wire from 1 to 10 mm², or two conductors of 0.5 to 2.5 mm². The spring-type terminals on the coil and main contacts eliminate the need for torque verification.

Will the 3RT2027-2AC20 drop into a panel specified for a Size S0 contactor from the same family?

Yes — it shares the same Size S0 footprint, 45 mm width, and DIN-rail mounting as other SIRIUS Size S0 contactors. The spring terminals may require a different wiring habit than screw-clamp variants, but the physical envelope and rail position are identical.

MPN
3RT2027-2AC20