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Siemens 3RK4340-3ER51-0BA0 — Motor Starters

Siemens SIRIUS 3RK4340-3ER51-0BA0 Motor Starter, 1.6 A AC-3

MPN3RK4340-3ER51-0BA0

Siemens SIRIUS 3RK4340-3ER51-0BA0, I/O-controlled direct-on-line motor starter, 1.6 A AC-3 at 400 V, Class 10, IP55, 24 V DC control.

$262.89Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RK4340-3ER51-0BA0 — Identification
ParameterValue
Product designationmotor starter MCU, I/O controlled
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RK4340-3ER51-0BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)1.1 ... 1.6 A
Duty / utilization type (IEC 60947-6-2)1
3RK4340-3ER51-0BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4340-3ER51-0BA0 — Communication
ParameterValue
AS-Interface protocol supportNo
3RK4340-3ER51-0BA0 — 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

What this motor starter does in the panel

The Siemens SIRIUS 3RK4340-3ER51-0BA0 is an I/O-controlled direct-on-line (DOL) motor starter — a single package combining a contactor and a bimetal overload relay for a 3-phase motor up to 1.6 A AC-3 at 400 V.

Control voltage is 24 V DC (20.4 to 26.4 V range), so it drops straight into a standard 24 VDC control bus without an extra power supply tap. The main circuit supply accepts 340 to 440 V AC at 50/60 Hz — common for 400 V three-phase grids worldwide. No PROFINET or PROFIBUS onboard — this is a pure I/O-controlled unit, so the PLC connects via discrete outputs. If you need fieldbus integration, you are looking at a different SIRIUS variant with a communication module.

The starter measures 182 mm wide, 220 mm high, and 145 mm deep.

Frequently asked questions

What is the current rating of 3RK4340-3ER51-0BA0?

The AC-3 motor rating at 400 V is 1.6 A. That is the maximum full-load current for a standard induction motor this starter can switch.

Is 3RK4340-3ER51-0BA0 a DOL starter?

Yes, it is a direct-on-line starter — a contactor and bimetal overload in one IP55 enclosure, designed for across-the-line starting of a 3-phase motor.

Does 3RK4340-3ER51-0BA0 have PROFINET or PROFIBUS?

No. This variant has no PROFINET or PROFIBUS communication; it is controlled via discrete I/O from the PLC.

Where can I buy 3RK4340-3ER51-0BA0 and get a price?

This part is sourced to order against an RFQ through independent distribution. Submit a request for quote and we will confirm current availability and pricing at that time.

MPN
3RK4340-3ER51-0BA0