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Siemens 3RK4320-3DQ51-1BA2 — Motor Starters

Siemens 3RK4320-3DQ51-1BA2 SIRIUS Motor Starter

MPN3RK4320-3DQ51-1BA2

Siemens SIRIUS 3RK4320-3DQ51-1BA2 reversing motor starter, AS-Interface, 1.25 A at 400 V AC-3, Class 10, IP54, 205 x 245 x 215 mm.

Siemens 3RK4320-3DQ51-1BA2 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

3RK4320-3DQ51-1BA2 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q

Protection & Tripping

3RK4320-3DQ51-1BA2 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)0.9 ... 1.25 A
Duty / utilization type (IEC 60947-6-2)1

Contacts & Control

3RK4320-3DQ51-1BA2 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical

Communication

3RK4320-3DQ51-1BA2 — Communication
ParameterValue
AS-Interface protocol supportYes

Mechanical & Connection

3RK4320-3DQ51-1BA2 — 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

AS-Interface reversing starter for 1.25 A motor branches

The 3RK4320-3DQ51-1BA2: This SIRIUS motor starter is a reversing starter designed for AS-Interface networks — it handles forward/reverse control of a small motor branch without external contactor interlocking. Two digital inputs are available on the device for local pushbuttons or limit switches, and the control supply is 20.4...26.4 V DC — common for AS-Interface power.

Panel fit and environmental rating

The enclosure measures 205 mm deep, 245 mm wide, and 215 mm high — a compact footprint for a reversing starter with integrated motor protection and AS-i interface. Rated IP54 — suitable for installation inside a control cabinet or in a protected machine enclosure where dust and splash ingress are limited.

Frequently asked questions

What is 3RK4320-3DQ51-1BA2 used for?

It is a reversing motor starter for AS-Interface networks, rated 1.25 A at 400 V AC-3 with Class 10 bimetal overload protection — used for forward/reverse control of small three-phase motors in automated machinery.

MPN
3RK4320-3DQ51-1BA2