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Siemens 3RA2125-1BA23-0AK6 — Motor Starters

Siemens 3RA2125-1BA23-0AK6 SIRIUS Motor Starter

MPN3RA2125-1BA23-0AK6

Siemens SIRIUS 3RA2125-1BA23-0AK6 non-fused motor starter, direct starter, size S0, 750 W at 400 V, Trip Class 10, 45 mm width, 97.1 mm depth, 193.1 mm height, snap-on DIN rail mount.

$504.76Ref. price · indicative, final on quote

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Siemens 3RA2125-1BA23-0AK6 datasheet (PDF)

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

Specifications

3RA2125-1BA23-0AK6 — Identification
Parameter	Value
Product designation	non-fused motor starter 3RA2
Main circuit poles	3
Brand	SIRIUS
Load feeder size	S0
Product design / construction	direct starter
Circuit-breaker size	S00
Included contactor (type)	3RT2023-1AK60
Included circuit-breaker (type)	3RV2011-1BA15
Included link module (type)	3RA2921-1AA00

3RA2125-1BA23-0AK6 — Ratings & Performance
Parameter	Value
Rated motor power at 400 V	750 W
Operational current Ie, AC-3 at 400 V	1.9 A
Rated voltage at AC-3, max.	690 V
Rated motor power at 460/480 V (hp)	0.75 hp
Rated motor power at 575/600 V (hp)	1 hp
Rated current at 480 V	1.63 A
Rated current at 600 V	1.72 A
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

3RA2125-1BA23-0AK6 — Protection & Tripping
Parameter	Value
Trip class	CLASS 10
Short-circuit protection	Yes
Rated short-circuit current at 400 V (IEC 60947-4-1)	153 000 A
Overload release setting range (current)	1.4 ... 2 A
Overload release type	thermal (bimetallic)
Short-circuit trip type	magnetic
Duty / utilization type (IEC 60947-6-2)	2

3RA2125-1BA23-0AK6 — Contacts & Control
Parameter	Value
Rated value	690 V
Rated voltage range at 50 Hz	88 ... 121 V
Auxiliary contacts, NO	2
Auxiliary contacts, NC	2
Auxiliary switch extension	Yes
Switching contact type	electromechanical

3RA2125-1BA23-0AK6 — Mechanical & Connection
Parameter	Value
Main circuit connection type	screw-type terminals
Main contact conductor range (AWG)	2x (16 ... 12), 2x (14 ... 8)
Mounting / fastening method	Snap-mounted to DIN rail or screw-mounted with additional push-in lug
Mounting position	vertical
Width	45 mm
Height	193.1 mm
Depth	97.1 mm

3RA2125-1BA23-0AK6 — Environmental
Parameter	Value
Operating temperature range	-20 ... +60 °C
Storage temperature range	-50 ... +80 °C
Transport temperature range	-55 ... +80 °C
Pollution degree	3
Shock resistance (IEC 60068-2-27)	6g / 11 ms

Product details

S0 footprint and panel fit

The 3RA2125-1BA23-0AK6 is a SIRIUS 3RA2 non-fused direct starter in size S0 — 45 mm wide, 97.1 mm deep, 193.1 mm high — which slots into the standard S0 mounting grid alongside other SIRIUS feeders. Clearance spaces: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side — no rear clearance needed. These are the minimum free-air gaps for heat dissipation and wiring access.

Trip Class 10 and thermal overload

The coil draws from a 50/60 Hz supply: 88–121 V at 50 Hz, 96–132 V at 60 Hz. The supplied contactor is a 3RT2023-1AK60; the link module is a 3RA2921-1AA00. Main contact wiring accepts 1–10 mm² stranded, or 2× (2.5–6 mm²).

Frequently asked questions

What are the clearance requirements around this motor starter?

Minimum clearances: 30 mm above, 10 mm in front, 10 mm below, 9 mm to the side. No clearance needed behind the unit. These gaps ensure proper airflow and wiring access in the panel.