Siemens 3RA2125-1FH24-0FB4 SIRIUS Motor Starter

Name: 3RA2125-1FH24-0FB4
Brand: Siemens
SKU: 3RA2125-1FH24-0FB4
Availability: LimitedAvailability
Author: Dropship Dasha

Specifications

Identification

3RA2125-1FH24-0FB4 — 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)	3RT2024-2FB40
Included circuit-breaker (type)	3RV2021-1FA25
Included link module (type)	3RA2921-2AA00

Ratings & Performance

3RA2125-1FH24-0FB4 — Ratings & Performance
Parameter	Value
Rated motor power at 400 V	1 500 W
Operational current Ie, AC-3 at 400 V	3.6 A
Rated voltage at AC-3, max.	690 V
Rated operating frequency	50 ... 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

3RA2125-1FH24-0FB4 — 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)	3.5 ... 5 A
Overload release type	thermal (bimetallic)
Short-circuit trip type	magnetic
Duty / utilization type (IEC 60947-6-2)	2

Contacts & Control

3RA2125-1FH24-0FB4 — Contacts & Control
Parameter	Value
Rated value	24 ... 24 V
Control supply voltage type	DC
Auxiliary contacts, NO	1
Auxiliary contacts, NC	1
Auxiliary switch extension	Yes
Switching contact type	electromechanical

Communication

3RA2125-1FH24-0FB4 — Communication
Parameter	Value
AS-Interface protocol support	No

Mechanical & Connection

3RA2125-1FH24-0FB4 — 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

3RA2125-1FH24-0FB4 — 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-on-line starter for 60 mm busbar systems

The 3RA2125-1FH24-0FB4 is a Siemens SIRIUS direct-on-line starter — a pre-assembled combination of a contactor, overload relay, and circuit breaker in one S0 footprint that snaps onto a 60 mm busbar system.

Supplied components and wiring terminals

The starter ships with the contactor 3RT2024-2FB40, the link module 3RA2921-2AA00, the circuit breaker 3RV2021-1FA25, and the busbar adapter 8US1251-5NT11. Both main and auxiliary/control circuits use spring-loaded terminals — no screw torque to verify, just strip and push. Rated operating frequency is 50 to 60 Hz; maximum voltage in AC-3 duty is 690 V. The unit is designed for vertical mounting only, with clearances: 50 mm upwards, 20 mm forwards, 10 mm downwards, and 20 mm at the side. Backwards clearance is zero — the busbar adapter sits flush.

Frequently asked questions

What is 3RA2125-1FH24-0FB4's listed depth?

The depth is 165 mm, with a width of 45 mm and height of 260 mm. These dimensions include the busbar adapter and the supplied circuit breaker.

What compliance documentation does Siemens provide for this starter?

The evidence does not list specific compliance certificates (RoHS, REACH, UL, IEC) for this order code. Standard Siemens SIRIUS documentation applies — confirm with your local Siemens support or request the declaration at quote time.