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Siemens 3RK4340-3PR51-0BA0 — Motor Starters

Siemens 3RK4340-3PR51-0BA0 SIRIUS MCU, 12 A AC-3, CLASS 10

MPN3RK4340-3PR51-0BA0

Siemens SIRIUS motor starter MCU, I/O controlled, direct starter, 12 A at AC-3 400 V, CLASS 10, IP55, 20.4-26.4 V DC control, 3RK4340-3PR51-0BA0.

Siemens 3RK4340-3PR51-0BA0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RK4340-3PR51-0BA0 — Identification
ParameterValue
Product designationmotor starter MCU, I/O controlled
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RK4340-3PR51-0BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)9 ... 12.5 A
Duty / utilization type (IEC 60947-6-2)1
3RK4340-3PR51-0BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4340-3PR51-0BA0 — Communication
ParameterValue
AS-Interface protocol supportNo
3RK4340-3PR51-0BA0 — 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

Rated operating voltage is 340 to 440 V, 50/60 Hz, and the control supply is 20.4 to 26.4 V DC. The IP55 enclosure handles dust and water jets.

AC-3 covers starting and plugging of squirrel-cage motors, which is the typical duty for conveyors, pumps, and fans. The control supply range (20.4 to 26.4 V DC) is the coil holding voltage — it drops out below that threshold.

Where this class of part is used

Motor starters in this class are used in industrial control panels to switch and protect three-phase motors in applications like material handling, packaging lines, HVAC, and process pumps. The direct-starter design means the motor runs at full speed when the contactor is closed — no soft-start or reversing. The I/O-controlled variant accepts commands from a PLC or control system via the DC control input.

Frequently asked questions

What is the difference between SIRIUS MCU and M200D?

The SIRIUS MCU (Motor Control Unit) is a compact direct-starter block with integrated overload and short-circuit protection, while the M200D is a motor starter with integrated fieldbus communication. The 3RK4340-3PR51-0BA0 is an I/O-controlled MCU without bus communication, making it a simpler, lower-cost option for hardwired control panels.

Where can I buy 3RK4340-3PR51-0BA0?

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

MPN
3RK4340-3PR51-0BA0