Siemens 3RA1125-1BL16-2BB4 SIRIUS non-fused load feeder

Specifications

3RA1125-1BL16-2BB4 — Identification
Parameter	Value
Product designation	non-fused load feeder
Main circuit poles	3
Brand	SIRIUS
Load feeder size	S0
Product design / construction	direct starter
Included contactor (type)	3RT1016-1BB42
Included circuit-breaker (type)	3RV1021-1BA15
Included link module (type)	3RA1921-1AA00
Reference designation (IEC 81346-2)	Q

3RA1125-1BL16-2BB4 — Ratings & Performance
Parameter	Value
Rated motor power at 400 V	0.75 kW
Operational current Ie, AC-3 at 400 V	1.9 A
Rated impulse withstand voltage (Uimp)	6 kV
Mechanical service life, typ. (switching cycles)	10 000 000

3RA1125-1BL16-2BB4 — Protection & Tripping
Parameter	Value
Short-circuit protection	Yes
Overload release setting range (current)	1.4 ... 2 A
Duty / utilization type (IEC 60947-6-2)	1

3RA1125-1BL16-2BB4 — Contacts & Control
Parameter	Value
Control supply voltage type	DC
Auxiliary contacts, NO	1
Auxiliary contacts, NC	2
Auxiliary switch extension	Yes
Switching contact type	electromechanical

3RA1125-1BL16-2BB4 — Communication
Parameter	Value
AS-Interface protocol support	No

3RA1125-1BL16-2BB4 — Mechanical & Connection
Parameter	Value
Main circuit connection type	screw-type terminals
Mounting / fastening method	snap-on mounting
Mounting position	with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back
Width	45 mm
Height	205 mm
Depth	154 mm

3RA1125-1BL16-2BB4 — Environmental
Parameter	Value
Operating temperature range	-20 ... +70 °C
Storage temperature range	-55 ... +80 °C
Pollution degree	3

Product details

SIRIUS 3RA1125-1BL16-2BB4 non-fused load feeder, direct starter, size S0

The Siemens 3RA1125-1BL16-2BB4 is a SIRIUS non-fused load feeder configured as a direct starter in size S0, rated for 0.75 kW at 400 V with a 24 V DC coil. The 45 mm width and 205 mm height fit standard panel layouts; clearance requirements are 30 mm upward and at the sides, 10 mm forward, and 9 mm backward, with 0 mm clearance needed downward or for side-by-side mounting.

Rated power and motor protection

Rated at 0.75 kW at 400 V, this direct starter uses bimetal motor protection (type of assignment 1) to guard against overload. The electromechanical switching contact handles a no-load switching frequency of 15 1/s.

Environmental and mounting conditions

Shock resistance is 12.5g.

Frequently asked questions

Is the Siemens 3RA1125-1BL16-2BB4 obsolete and what is its replacement?

Buyers need to know if the part is end-of-life and must find a direct successor to avoid redesign or sourcing risk.

Where can I buy the 3RA1125-1BL16-2BB4 and what is the current price?

Sourcing buyers need immediate pricing and stock information to fill a BOM line or place a purchase order.

What is the lead time for ordering 3RA1125-1BL16-2BB4?

Delivery time impacts production scheduling; maintenance techs may need a fast replacement for a failed unit.

Does the 3RA1125-1BL16-2BB4 have a direct cross-reference with the SIRIUS 3RA2 series?

Design engineers validating compatibility need to know if the successor is a drop-in replacement without design changes.

What is the rated current and voltage of 3RA1125-1BL16-2BB4?

Validation of fit for the motor load requires accurate electrical specifications; even though in datasheet, it's a top question.

Is the 3RA1125-1BL16-2BB4 in stock now and which distributors carry it?

Brokers checking lifecycle and availability need immediate stock status to secure inventory before obsolescence.