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Siemens 3RA2120-1HE24-0BB4 — Motor Starters

Siemens 3RA2120-1HE24-0BB4 SIRIUS Direct Starter, S0

MPN3RA2120-1HE24-0BB4
Active

Siemens SIRIUS 3RA2120-1HE24-0BB4 direct online starter, size S0, 3 kW at 400 V AC-3, 24 V DC coil, Class 10 thermal overload, spring-loaded terminals, 45 mm wide.

Siemens 3RA2120-1HE24-0BB4 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RA2120-1HE24-0BB4 — Identification
ParameterValue
Product designationDirect (on-line) starter
Main circuit poles3
BrandSIRIUS
Load feeder sizeS0
Product design / constructionfor standard rail or screw mounting
Circuit-breaker sizeS0
Included contactor (type)3RT2024-2BB40
Included circuit-breaker (type)3RV2021-1HA20
Included link module (type)3RA2921-2AA00

Ratings & Performance

3RA2120-1HE24-0BB4 — Ratings & Performance
ParameterValue
Rated motor power at 400 V3 000 W
Operational current Ie, AC-3 at 400 V6.5 A
Rated voltage at AC-3, max.690 V
Rated motor power at 460/480 V (hp)5 hp
Rated motor power at 575/600 V (hp)5 hp
Rated current at 480 V8 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

Protection & Tripping

3RA2120-1HE24-0BB4 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Short-circuit protectionYes
Rated short-circuit current at 400 V (IEC 60947-4-1)150 000 A
Overload release setting range (current)5.5 ... 8 A
Overload release typethermal (bimetallic)
Short-circuit trip typemagnetic
Duty / utilization type (IEC 60947-6-2)2

Contacts & Control

3RA2120-1HE24-0BB4 — Contacts & Control
ParameterValue
Rated value24 ... 24 V
Control supply voltage typeDC
Auxiliary switch extensionYes
Switching contact typeelectromechanical

Communication

3RA2120-1HE24-0BB4 — Communication
ParameterValue
AS-Interface protocol supportNo

Mechanical & Connection

3RA2120-1HE24-0BB4 — Mechanical & Connection
ParameterValue
Mounting / fastening methodscrew and snap-on mounting onto 35 mm standard mounting rail
Mounting positionvertical
Width45 mm
Height243 mm
Depth107 mm

Environmental

3RA2120-1HE24-0BB4 — Environmental
ParameterValue
Operating temperature range-20 ... +60 °C
Storage temperature range-50 ... +80 °C
Transport temperature range-50 ... +80 °C
Shock resistance (IEC 60068-2-27)6g / 11 ms

Product details

Motor rating and trip class for the load

The 3RA2120-1HE24-0BB4: This SIRIUS direct online starter is rated 3 kW at 400 V and 8 A at 480 V in AC-3 duty, covering standard three-phase motor loads up to those currents at 50/60 Hz. The 24 V DC coil (rated value 24... 24 V) keeps the control circuit isolated from the motor power side, which simplifies wiring in PLC-controlled panels where 24 VDC is the standard I/O voltage.

The supplied contactor (3RT2024-2BB40) and circuit-breaker (3RV2021-1HA20) are pre-assembled with the link module (3RA2921-2AA00), so the unit arrives as a single mechanical assembly ready to wire.

Active production and sourcing posture

The substance prohibition date of 03/01/2017 confirms RoHS compliance for the European market, which covers the majority of industrial panel builds.

MPN
3RA2120-1HE24-0BB4