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Siemens 3RK4320-3PQ51-0BA2 — Motor Starters

SIRIUS 3RK4320-3PQ51-0BA2 Motor Starter, 12 A AC-3

MPN3RK4320-3PQ51-0BA2

SIRIUS 3RK4320-3PQ51-0BA2, motor starter MCU for AS-Interface, direct starter, 12 A AC-3 at 400 V, IP54, DC control supply 20.4-26.4 V, built-in brake output.

Siemens 3RK4320-3PQ51-0BA2 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RK4320-3PQ51-0BA2 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q

Protection & Tripping

3RK4320-3PQ51-0BA2 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)9 ... 12.5 A
Duty / utilization type (IEC 60947-6-2)1

Contacts & Control

3RK4320-3PQ51-0BA2 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical

Communication

3RK4320-3PQ51-0BA2 — Communication
ParameterValue
AS-Interface protocol supportYes

Mechanical & Connection

3RK4320-3PQ51-0BA2 — 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
Width245 mm
Height215 mm
Depth205 mm

Product details

What is the 3RK4320-3PQ51-0BA2?

The SIRIUS 3RK4320-3PQ51-0BA2 is a motor starter MCU (Motor Control Unit) designed for AS-Interface networks — a direct starter with electromechanical switching contacts and bimetal motor protection. Built for washdown or dusty environments with an IP54 enclosure, this starter handles ambient temperatures from -25 to +50 °C. The DC control supply runs on 20.4 to 26.4 V, and the unit includes a built-in motor brake output — a feature that saves an external contactor on applications needing mechanical holding.

AS-Interface Integration and Dimensions

This starter communicates natively over AS-Interface (the protocol is supported), with two digital inputs on board. It does not support PROFINET or PROFIBUS DP, so if your line runs those fieldbuses, you'll need a gateway or a different variant. Physical footprint: 245 mm wide, 215 mm high, 205 mm deep.

Frequently asked questions

Where can I purchase the SIRIUS 3RK4320-3PQ51-0BA2 motor starter?

The 3RK4320-3PQ51-0BA2 is sourced to order against an RFQ through independent industrial-automation distribution. Submit a request for quote (RFQ) to confirm current availability and pricing at the time of your order.

Does the 3RK4320-3PQ51-0BA2 include a built-in brake?

Yes, the product component includes a motor brake output. This saves adding a separate brake contactor for applications like vertical loads or holding brakes.

Is the 3RK4320-3PQ51-0BA2 compatible with AS-Interface?

Yes, the AS-Interface protocol is supported. The unit communicates natively on AS-Interface networks and does not require a gateway for that protocol.

MPN
3RK4320-3PQ51-0BA2