BOM / RFQ

Siemens 3RA2120-4BD26-0BB4 — Motor Starters

Siemens 3RA2120-4BD26-0BB4 SIRIUS Starter

MPN3RA2120-4BD26-0BB4

Active

Siemens SIRIUS 3RA2120-4BD26-0BB4 direct-on-line starter, Size S0, 20 A AC-3 at 400 V, Class 10, screw terminals, for 60 mm busbars.

$147.32Ref. price · indicative, final on quote

Add to RFQ

Siemens 3RA2120-4BD26-0BB4 datasheet (PDF)

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RA2120-4BD26-0BB4 — Identification
Parameter	Value
Product designation	Direct (on-line) starter
Main circuit poles	3
Brand	SIRIUS
Load feeder size	S0
Product design / construction	for 60 mm busbars
Circuit-breaker size	S0
Included contactor (type)	3RT2026-1BB40
Included circuit-breaker (type)	3RV2021-4BA10
Included link module (type)	3RA2921-1BA00

3RA2120-4BD26-0BB4 — Ratings & Performance
Parameter	Value
Rated motor power at 400 V	7 500 kW
Rated voltage at AC-3, max.	690 V
Rated motor power at 460/480 V (hp)	15 hp
Rated current at 480 V	20 A
Rated current at 600 V	20 A
Rated operating frequency	50 ... 60 Hz
Rated impulse withstand voltage (Uimp)	6 kV
Rated insulation voltage Ui (AC, pollution degree 3)	690 V

3RA2120-4BD26-0BB4 — Protection & Tripping
Parameter	Value
Trip class	CLASS 10
Short-circuit protection	Yes
Rated short-circuit current at 400 V (IEC 60947-4-1)	150 000 A
Overload release setting range (current)	13 ... 20 A
Overload release type	thermal (bimetallic)
Short-circuit trip type	magnetic
Duty / utilization type (IEC 60947-6-2)	1

3RA2120-4BD26-0BB4 — Contacts & Control
Parameter	Value
Rated value	24 ... 24 V
Control supply voltage type	DC
Auxiliary switch extension	Yes
Switching contact type	electromechanical

3RA2120-4BD26-0BB4 — Communication
Parameter	Value
AS-Interface protocol support	No

3RA2120-4BD26-0BB4 — Mechanical & Connection
Parameter	Value
Mounting / fastening method	for snapping onto 60 mm busbar systems
Mounting position	vertical
Width	45 mm
Height	260 mm
Depth	165 mm

3RA2120-4BD26-0BB4 — Environmental
Parameter	Value
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

20 A AC-3 at 400 V — motor duty rating for S0 frame

The 3RA2120-4BD26-0BB4: That 20 A figure governs motor switching up to the rated maximum of 690 V AC-3 — the current limit is the binding constraint for motor branch sizing, not the voltage ceiling.

Mounting on 60 mm busbar systems — panel integration

Designed for snapping onto 60 mm busbar systems, the starter occupies a 45 mm width in the S0 frame. The supplied contactor is 3RT2026-1BB40 and the link module is 3RA2921-1BA00 — these are the matched internal components, so replacement or service swaps stay within the same bill-of-material footprint.

Frequently asked questions

How do I get current pricing and availability for 3RA2120-4BD26-0BB4?

Pricing and stock are confirmed at quote time against your BOM quantity. Submit an RFQ through this listing; the response will include current lead time and volume pricing from independent distribution channels.