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Siemens 3RT2027-1AC20 — Contactors

Siemens 3RT2027-1AC20 SIRIUS Power Contactor, S0 Frame, 97 mm Depth

MPN3RT2027-1AC20
Active

Siemens, SIRIUS, Power contactor, 3RT2027-1AC20, S0 size, screw-type terminals, 45 mm width, 97 mm depth, 85 mm height, 1... 10 mm² solid/stranded.

$54.61Ref. price · indicative, final on quote
Siemens 3RT2027-1AC20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2027-1AC20 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-1AC20 — 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
3RT2027-1AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz24 V
3RT2027-1AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-1AC20 — 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)
3RT2027-1AC20 — 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
3RT2027-1AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-1AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-1AC20 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth97 mm
3RT2027-1AC20 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

Critical Spare for Legacy Control Panels

It uses screw-type terminals for secure field wiring and includes a built-in auxiliary switch for status feedback — a detail that saves an extra add-on block in tight cabinets.

Mounting and Wiring Clearances

The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, giving flexibility in retrofits. Required clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side — note the side gap is narrower, so plan gland-plate entry accordingly.

Environmental Limits

Rated for operation from -25 to +60 °C, with storage range extending from -55 to +80 °C. The storage rating covers handling and shelf life — especially relevant for spares kept in unconditioned stores.

Frequently asked questions

What wire sizes does the 3RT2027-1AC20 accept?

Screw terminals accept solid or stranded wire from 1 to 10 mm².

What is the mechanical endurance of this contactor?

Typical 10,000,000 operations.

MPN
3RT2027-1AC20