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Siemens 3RK4340-3HR51-1BA0 — Motor Starters

Siemens 3RK4340-3HR51-1BA0 SIRIUS Reversing Starter

MPN3RK4340-3HR51-1BA0

Siemens SIRIUS motor starter MCU, I/O controlled, reversing starter, 3.2 A at AC-3 400 V, Class 10 bimetal overload, IP55, 340–440 V operating voltage, 20.4–26.4 V DC control supply.

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

Specifications

3RK4340-3HR51-1BA0 — Identification
ParameterValue
Product designationmotor starter MCU, I/O controlled
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q
3RK4340-3HR51-1BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)2.2 ... 3.2 A
Duty / utilization type (IEC 60947-6-2)1
3RK4340-3HR51-1BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4340-3HR51-1BA0 — Communication
ParameterValue
AS-Interface protocol supportNo
3RK4340-3HR51-1BA0 — Mechanical & Connection
ParameterValue
Main circuit connection typescrew-type terminals
Mounting position+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface
Width182 mm
Height220 mm
Depth145 mm

Product details

Reversing Starter with Bimetal Overload — 3.2 A AC-3 at 400 V

Rated 3.2 A in AC-3 duty at 400 V, it switches motor loads up to that current under standard starting conditions. The built-in bimetal overload protection is set to Trip Class 10, so it will trip within 10 seconds at 7.2× the thermal setting — appropriate for standard induction motor starts where the rotor is not locked. Operating voltage for the main circuit is 340–440 V AC at 50/60 Hz, and the control supply is 20.4–26.4 V DC. The enclosure is IP55, so the unit is dust-protected and can handle water jets from any direction — suitable for washdown areas or outdoor cabinets where hose-down cleaning is routine.

This reversing starter is designed for vertical mounting surfaces, with ±180° rotation possible on that surface, and can be tilted forward or backward by ±22.5°. That flexibility helps when fitting into tight enclosures or aligning with existing cable entries. The unit measures 182 mm wide by 220 mm high by 145 mm deep — a compact footprint for a reversing starter with integrated overload. No fieldbus communication is onboard (no PROFINET, PROFIBUS, or AS-Interface), so it is controlled via hardwired I/O from a PLC or relay logic.

Frequently asked questions

Can 3RK4340-3HR51-1BA0 be used as a reversing starter?

Yes, the Siemens 3RK4340-3HR51-1BA0 is specifically designed as a reversing starter, meaning it controls both forward and reverse motor rotation from a single unit. It includes integrated bimetal overload protection rated Class 10.

Where can I buy 3RK4340-3HR51-1BA0?

This part is sourced to order against an RFQ. Availability and pricing are confirmed at quote time.

MPN
3RK4340-3HR51-1BA0