Skip to main content
Log in
Siemens 3RA2125-4DA27-0AK6 — Motor Starters

Siemens 3RA2125-4DA27-0AK6 SIRIUS Motor Starter, Size S0

MPN3RA2125-4DA27-0AK6

Siemens SIRIUS 3RA2125-4DA27-0AK6 non-fused motor starter, direct starter, Size S0, 11 kW at 400 V, CLASS 10 thermal overload, 45 mm width, snap-on DIN rail.

$504.76Ref. price · indicative, final on quote
Siemens 3RA2125-4DA27-0AK6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RA2125-4DA27-0AK6 — Identification
ParameterValue
Product designationnon-fused motor starter 3RA2
Main circuit poles3
BrandSIRIUS
Load feeder sizeS0
Product design / constructiondirect starter
Circuit-breaker sizeS0
Included contactor (type)3RT2027-1AK60
Included circuit-breaker (type)3RV2021-4DA15
Included link module (type)3RA2921-1AA00
3RA2125-4DA27-0AK6 — Ratings & Performance
ParameterValue
Rated motor power at 400 V11 000 W
Operational current Ie, AC-3 at 400 V22 A
Rated voltage at AC-3, max.690 V
Rated motor power at 460/480 V (hp)15 hp
Rated motor power at 575/600 V (hp)20 hp
Rated current at 480 V22.2 A
Rated current at 600 V21.9 A
Rated operating frequency50 ... 60 Hz
Rated impulse withstand voltage (Uimp)6 kV
Rated insulation voltage Ui (AC, pollution degree 3)690 V
Mechanical service life, typ. (switching cycles)10 000 000
3RA2125-4DA27-0AK6 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Short-circuit protectionYes
Rated short-circuit current at 400 V (IEC 60947-4-1)153 000 A
Overload release setting range (current)20 ... 25 A
Overload release typethermal (bimetallic)
Short-circuit trip typemagnetic
Duty / utilization type (IEC 60947-6-2)2
3RA2125-4DA27-0AK6 — Contacts & Control
ParameterValue
Rated value690 V
Rated voltage range at 50 Hz88 ... 121 V
Auxiliary contacts, NO2
Auxiliary contacts, NC2
Auxiliary switch extensionYes
Switching contact typeelectromechanical
3RA2125-4DA27-0AK6 — Mechanical & Connection
ParameterValue
Main circuit connection typescrew-type terminals
Main contact conductor range (AWG)2x (16 ... 12), 2x (14 ... 8)
Mounting / fastening methodSnap-mounted to DIN rail or screw-mounted with additional push-in lug
Mounting positionvertical
Width45 mm
Height193.1 mm
Depth97.1 mm
3RA2125-4DA27-0AK6 — Environmental
ParameterValue
Operating temperature range-20 ... +60 °C
Storage temperature range-50 ... +80 °C
Transport temperature range-55 ... +80 °C
Pollution degree3
Shock resistance (IEC 60068-2-27)6g / 11 ms

Product details

What this SIRIUS starter delivers

The 3RA2125-4DA27-0AK6: It ships as a complete assembly: a 3RT2027-1AK60 contactor paired with a thermal bimetallic overload relay, plus the 3RA2921-1AA00 link module that ties them together.

Mounting and panel fit

Dimensions are 45 mm wide × 193.1 mm high × 97.1 mm deep, with 30 mm clearance needed above and 10 mm below for airflow and wiring access. Main power terminals accept 1 to 10 mm² stranded wire, or two conductors of 2.5 to 6 mm² each — useful for daisy-chaining feed-through circuits.

MPN
3RA2125-4DA27-0AK6