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Siemens 3RA2125-4BD26-0AK6 — Motor Starters

Siemens 3RA2125-4BD26-0AK6 SIRIUS Non-Fused Motor Starter

MPN3RA2125-4BD26-0AK6

Siemens SIRIUS 3RA2125-4BD26-0AK6 non-fused direct motor starter, S0 size, CLASS 10 thermal bimetallic overload, 690 V AC-3 max, 45 mm wide, snaps onto 60 mm busbar.

Siemens 3RA2125-4BD26-0AK6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RA2125-4BD26-0AK6 — 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)3RT2026-1AK60
Included circuit-breaker (type)3RV2021-4BA15
Included link module (type)3RA2921-1AA00
3RA2125-4BD26-0AK6 — Ratings & Performance
ParameterValue
Rated motor power at 400 V7 500 W
Operational current Ie, AC-3 at 400 V15.5 A
Rated voltage at AC-3, max.690 V
Rated motor power at 460/480 V (hp)10 hp
Rated motor power at 575/600 V (hp)15 hp
Rated current at 480 V15.2 A
Rated current at 600 V17.8 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
3RA2125-4BD26-0AK6 — 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)14 ... 20 A
Overload release typethermal (bimetallic)
Short-circuit trip typemagnetic
Duty / utilization type (IEC 60947-6-2)2
3RA2125-4BD26-0AK6 — 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
3RA2125-4BD26-0AK6 — Mechanical & Connection
ParameterValue
Main circuit connection typescrew-type terminals
Main contact conductor range (AWG)2x (16 ... 12), 2x (14 ... 8)
Mounting / fastening methodfor snapping onto 60 mm busbar systems
Mounting positionvertical
Width45 mm
Height260 mm
Depth155 mm
3RA2125-4BD26-0AK6 — 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

S0 frame, CLASS 10 trip — what that means for the panel

The 3RA2125-4BD26-0AK6: This is a Siemens SIRIUS 3RA2 non-fused direct motor starter, size S0, that ships as a pre-assembled unit: the supplied contactor (3RT2026-1AK60) and link module (3RA2921-1AA00) are matched to the thermal bimetallic overload relay.

Busbar snap-on and enclosure fit

Mounts by snapping directly onto 60 mm busbar systems — no separate DIN rail adapter needed for the main power feed. The S0 footprint is 45 mm wide, 260 mm tall, 155 mm deep. Clearance requirements: 30 mm upward, 10 mm forward, 10 mm downward, 9 mm at the sides, and zero backward — so you can push it against the back panel.

MPN
3RA2125-4BD26-0AK6