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Siemens 3RA2120-1KE24-0BB4 — Motor Starters

Siemens 3RA2120-1KE24-0BB4 SIRIUS Direct Starter, 12 A AC-3

MPN3RA2120-1KE24-0BB4
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Siemens SIRIUS 3RA2120-1KE24-0BB4 direct-on-line motor starter, Size S0, 12 A at 400 V AC-3, 24 V DC control, Class 10, screw and snap-on DIN-rail mount.

$106.68Ref. price · indicative, final on quote
Siemens 3RA2120-1KE24-0BB4 datasheet (PDF)
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

3RA2120-1KE24-0BB4 — 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)3RV2021-1KA20
Included link module (type)3RA2921-2AA00
3RA2120-1KE24-0BB4 — Ratings & Performance
ParameterValue
Rated motor power at 400 V5 500 kW
Rated voltage at AC-3, max.690 V
Rated motor power at 460/480 V (hp)7.5 hp
Rated motor power at 575/600 V (hp)10 hp
Rated current at 480 V11 A
Rated current at 600 V10 A
Rated operating frequency50 ... 60 Hz
Rated impulse withstand voltage (Uimp)6 kV
Rated insulation voltage Ui (AC, pollution degree 3)690 V
3RA2120-1KE24-0BB4 — 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)9 ... 12.5 A
Overload release typethermal (bimetallic)
Short-circuit trip typemagnetic
Duty / utilization type (IEC 60947-6-2)2
3RA2120-1KE24-0BB4 — Contacts & Control
ParameterValue
Rated value24 ... 24 V
Control supply voltage typeDC
Auxiliary switch extensionYes
Switching contact typeelectromechanical
3RA2120-1KE24-0BB4 — Communication
ParameterValue
AS-Interface protocol supportNo
3RA2120-1KE24-0BB4 — Mechanical & Connection
ParameterValue
Mounting / fastening methodscrew and snap-on mounting onto 35 mm DIN rail
Mounting positionvertical
Width45 mm
Height243 mm
Depth107 mm
3RA2120-1KE24-0BB4 — 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

12 A AC-3 motor switching, 24 V DC coil — panel-fit constraints

The 3RA2120-1KE24-0BB4: The control coil is 24 V DC — a common PLC output level — so it drops into a 24 VDC control circuit without an interposing relay. The S0 frame size (45 mm wide, 243 mm tall, 107 mm deep) fits standard 35 mm DIN-rail panels; allow 50 mm above and 20 mm in front for ventilation and wiring access.

The assembly ships with the contactor (3RT2024-2BB40) and link module (3RA2921-2AA00) pre-configured; main-circuit connections use spring-loaded terminals for tool-less wiring.

Motor sizing across voltage ranges

At 460/480 V it handles 7.5 hp; at 575/600 V it handles 10 hp — covering the common North American motor voltages in a single starter variant. For 230 V systems, it's rated 3 hp; for 110/120 V, 0.75 hp — useful for retrofit into legacy panels with mixed voltage feeds.

Frequently asked questions

What motor sizes does this starter cover at 480 V?

At 460/480 V it is rated for 7.5 hp; at 575/600 V it is rated for 10 hp. The AC-3 switching current at 400 V is 12 A.

MPN
3RA2120-1KE24-0BB4