Siemens 3RA2120-1JH24-0BB4 SIRIUS Direct Starter, 10 A AC-3

Name: 3RA2120-1JH24-0BB4
Brand: Siemens
SKU: 3RA2120-1JH24-0BB4
Availability: LimitedAvailability
Author: Authorized Aksel

Specifications

Identification

3RA2120-1JH24-0BB4 — 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)	3RT2024-2BB40
Included circuit-breaker (type)	3RV2021-1JA20
Included link module (type)	3RA2921-2AA00

Ratings & Performance

3RA2120-1JH24-0BB4 — Ratings & Performance
Parameter	Value
Rated motor power at 400 V	4 000 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 V	10 A
Rated current at 600 V	10 A
Rated operating frequency	50 ... 60 Hz
Rated impulse withstand voltage (Uimp)	6 kV
Rated insulation voltage Ui (AC, pollution degree 3)	690 V

Protection & Tripping

3RA2120-1JH24-0BB4 — 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)	7 ... 10 A
Overload release type	thermal (bimetallic)
Short-circuit trip type	magnetic
Duty / utilization type (IEC 60947-6-2)	2

Contacts & Control

3RA2120-1JH24-0BB4 — Contacts & Control
Parameter	Value
Rated value	24 ... 24 V
Control supply voltage type	DC
Auxiliary switch extension	Yes
Switching contact type	electromechanical

Communication

3RA2120-1JH24-0BB4 — Communication
Parameter	Value
AS-Interface protocol support	No

Mechanical & Connection

3RA2120-1JH24-0BB4 — 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

Environmental

3RA2120-1JH24-0BB4 — 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

SIRIUS direct starter, S0 frame, 10 A AC-3

The 3RA2120-1JH24-0BB4: The 24 VDC coil voltage matches standard control voltages in many industrial panels.

Mounting and termination for 60 mm busbars

Designed for snapping onto 60 mm busbar systems, this starter mounts vertically and occupies 45 mm width on the busbar — a standard footprint for S0 feeders in Siemens SIRIUS systems. The 165 mm depth and 260 mm height fit within typical panel clearances for busbar-mounted assemblies. Spring-loaded terminals on the main current circuit eliminate the need for screw torque verification, reducing wiring time and ensuring consistent contact pressure across the full 10 A rating.

Supplied as a complete assembly

The 3RA2120-1JH24-0BB4 ships as a factory-assembled unit including the 3RT2024-2BB40 contactor and the 3RA2921-2AA00 link module — no separate component matching or wiring between the contactor and overload is needed. This reduces installation errors and simplifies BOM management.

Frequently asked questions

What is the 3RA2120-1JH24-0BB4 rated for at 400 V?

The maximum operating voltage for AC-3 is 690 V.

What compliance documentation does Siemens provide for this starter?

As a Siemens SIRIUS product, the 3RA2120-1JH24-0BB4 carries CE marking and is designed to meet relevant IEC/EN standards for motor starters. Specific compliance documentation (RoHS, REACH, UL) is available on request at quote time.

How can I order the 3RA2120-1JH24-0BB4 and check availability?

Submit an RFQ for current pricing, lead time, and volume availability.