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Siemens 3RK4320-3ER51-0BA0 — Motor Starters

Siemens 3RK4320-3ER51-0BA0 SIRIUS Motor Starter, 1.6 A AC-3

MPN3RK4320-3ER51-0BA0

Siemens SIRIUS motor starter MCU for AS-Interface, 3RK4320-3ER51-0BA0, direct starter, 1.6 A AC-3 at 400 V, Class 10, IP55, 145 x 182 x 220 mm.

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

Specifications

3RK4320-3ER51-0BA0 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RK4320-3ER51-0BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)1.1 ... 1.6 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3ER51-0BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3ER51-0BA0 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3ER51-0BA0 — 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

Motor starter MCU for AS-Interface — 1.6 A, Class 10, IP55

The Siemens 3RK4320-3ER51-0BA0 is a SIRIUS motor starter MCU designed for AS-Interface bus communication, serving as a direct starter for three-phase motors up to 1.6 A in AC-3 duty at 400 V. Rated operating voltage is 340 to 440 V AC at 50/60 Hz, and the control supply is 20.4 to 26.4 V DC — typical for a 24 V DC control loop in a panel.

Mounting and integration — IP55 enclosure, flexible orientation

The unit measures 145 mm deep, 182 mm wide, and 220 mm high, and is rated IP55 — suitable for installation in enclosures where dust and water jets are present, but not for full washdown or submersion. Short-circuit protection is provided by upstream circuit breakers, and the device has three poles for the main current circuit.

Frequently asked questions

Where can I buy 3RK4320-3ER51-0BA0?

This part is sourced to order against an RFQ through independent distribution.

What is the AC-3 motor rating of 3RK4320-3ER51-0BA0?

Rated 1.6 A at 400 V AC-3 — that's the motor-switching current for standard squirrel-cage induction motors. Trip Class 10 provides fast overload protection.

Does 3RK4320-3ER51-0BA0 support PROFINET or PROFIBUS?

No. This unit communicates via AS-Interface protocol only; PROFINET and PROFIBUS DP are not supported.

MPN
3RK4320-3ER51-0BA0