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Siemens 3RK4340-3JR51-1BA0 — Motor Starters

Siemens 3RK4340-3JR51-1BA0 SIRIUS Reversing Starter

MPN3RK4340-3JR51-1BA0

Siemens SIRIUS motor starter MCU, I/O controlled reversing starter, 4 A at 400 V AC-3, IP55, bimetal overload, 20.4-26.4 V DC control supply.

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

Specifications

3RK4340-3JR51-1BA0 — Identification
ParameterValue
Product designationmotor starter MCU, I/O controlled
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q
3RK4340-3JR51-1BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)2.8 ... 4 A
Duty / utilization type (IEC 60947-6-2)1
3RK4340-3JR51-1BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4340-3JR51-1BA0 — Communication
ParameterValue
AS-Interface protocol supportNo
3RK4340-3JR51-1BA0 — 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

What this reversing starter delivers

The control supply is 20.4 to 26.4 V DC, which keeps the logic side isolated from the motor power. The main power circuit operates on 340 to 440 V AC, 50/60 Hz, and the unit draws its motor protection from a bimetal overload relay set to CLASS 10 trip curve — fast enough to protect standard induction motors during stall or jam conditions.

Rated IP55, so it's sealed against dust jets and low-pressure water — suitable for washdown areas or outdoor cabinets where moisture is a concern. The enclosure dimensions are 145 mm deep, 182 mm wide, and 220 mm tall, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward, giving panel builders flexibility in tight layouts. The unit has no built-in bus communication (PROFINET, PROFIBUS, AS-Interface all absent), so it's a hardwired I/O-controlled device — plan your control wiring accordingly.

Frequently asked questions

Where can I buy 3RK4340-3JR51-1BA0?

This Siemens SIRIUS reversing starter is sourced to order against an RFQ through independent distribution channels.

Is 3RK4340-3JR51-1BA0 a reversing starter?

Yes, the 3RK4340-3JR51-1BA0 is a reversing starter — it switches motor direction in a single enclosure, rated 4 A at 400 V AC-3.

MPN
3RK4340-3JR51-1BA0