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Siemens 3RK4320-3HQ51-0BA2 — Motor Starters

Siemens 3RK4320-3HQ51-0BA2 SIRIUS Motor Starter

MPN3RK4320-3HQ51-0BA2

Siemens SIRIUS motor starter MCU for AS-Interface, 3RK4320-3HQ51-0BA2, direct starter, 3.2 A at AC-3 400 V, CLASS 10, IP54, DC control supply 20.4–26.4 V.

StockContact for availability
Lead time3-5 Days wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RK4320-3HQ51-0BA2 — 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

3RK4320-3HQ51-0BA2 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)2.2 ... 3.2 A
Duty / utilization type (IEC 60947-6-2)1

Contacts & Control

3RK4320-3HQ51-0BA2 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical

Communication

3RK4320-3HQ51-0BA2 — Communication
ParameterValue
AS-Interface protocol supportYes

Mechanical & Connection

3RK4320-3HQ51-0BA2 — 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 this SIRIUS motor starter does on an AS-Interface line

The control supply is 20.4–26.4 V DC, and the operating voltage range is 340–440 V AC at 50/60 Hz. Two digital inputs are onboard for local control signals, and the unit includes a motor brake output — useful for holding loads on vertical conveyors or gantries. The IP54 enclosure means it's protected against dust ingress and splashing water, so it can live in a panel with moderate washdown exposure or on a machine frame in a dry industrial environment.

AS-Interface integration and mounting

This starter communicates natively over AS-Interface — no PROFIBUS or PROFINET on this variant, so it's a fit for legacy or cost-optimized AS-i lines where the bus handles both I/O and power. Dimensions are 205 mm deep, 245 mm wide, and 215 mm high — a compact footprint for a 3-pole motor starter with integrated bus communication.

Frequently asked questions

Is 3RK4320-3HQ51-0BA2 compatible with AS-Interface?

Yes, the AS-Interface protocol is supported on this unit — it's designed as a motor starter MCU for AS-Interface networks, with bus communication built in.

What voltage does the 3RK4320 motor starter use?

The control supply voltage is 20.4–26.4 V DC, and the operating voltage (main circuit) is 340–440 V AC at 50/60 Hz.

Where can I buy 3RK4320-3HQ51-0BA2 motor starter?

This part is sourced to order; availability and pricing are confirmed at quote time.

MPN
3RK4320-3HQ51-0BA2