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Siemens 3RK4340-3CR51-1BA0 — Motor Starters

Siemens 3RK4340-3CR51-1BA0 SIRIUS Reversing Starter, 1A AC-3

MPN3RK4340-3CR51-1BA0

Siemens SIRIUS motor starter MCU, reversing starter, 1 A AC-3 at 400 V, Trip Class 10, IP55, DC control 20.4-26.4 V, 3RK4340-3CR51-1BA0.

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

Specifications

3RK4340-3CR51-1BA0 — Identification
ParameterValue
Product designationmotor starter MCU, I/O controlled
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q
3RK4340-3CR51-1BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)0.7 ... 1 A
Duty / utilization type (IEC 60947-6-2)1
3RK4340-3CR51-1BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4340-3CR51-1BA0 — Communication
ParameterValue
AS-Interface protocol supportNo
3RK4340-3CR51-1BA0 — 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

It is designed for I/O control, not fieldbus, so it connects directly to a PLC's digital outputs via its DC control supply (20.4 to 26.4 V DC). The IP55 enclosure means it handles dust and water jets, suitable for installation in a control cabinet or on a machine frame where washdown or humidity is present.

Mounting and environment constraints

The 145 mm depth, 182 mm width, and 220 mm height fit standard enclosure layouts, but verify clearance for cable entry and heat dissipation at the higher end of the ambient range.

Frequently asked questions

Is the 3RK4340-3CR51-1BA0 a reversing starter?

Yes, it is a reversing starter. The product design is explicitly a reversing starter, meaning it contains two contactors interlocked to reverse a three-phase motor's direction.

Does the 3RK4340-3CR51-1BA0 support PROFINET or PROFIBUS communication?

No. This unit has no bus communication capability — no PROFINET, no PROFIBUS, no AS-Interface. It is an I/O-controlled reversing starter, so it requires hardwired digital outputs from a PLC or controller.

Where can I buy the 3RK4340-3CR51-1BA0?

This part is available to order through independent distribution channels. Submit an RFQ for current pricing and lead time — availability is confirmed at quote time.

MPN
3RK4340-3CR51-1BA0