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Siemens 3RK4320-3FQ51-0BA2 — Motor Starters

Siemens 3RK4320-3FQ51-0BA2 SIRIUS Motor Starter, 2 A AC-3

MPN3RK4320-3FQ51-0BA2

Siemens SIRIUS 3RK4320-3FQ51-0BA2 motor starter MCU for AS-Interface, direct starter, 2 A AC-3 at 400 V, CLASS 10, IP54.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RK4320-3FQ51-0BA2 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RK4320-3FQ51-0BA2 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)1.4 ... 2 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3FQ51-0BA2 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3FQ51-0BA2 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3FQ51-0BA2 — 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

It is a direct starter with electromechanical switching contacts and a CLASS 10 bimetal overload relay, rated for motor protection. This is a current-production part, so it remains a standard catalog item for new panel builds and legacy line expansions alike. No lifecycle phase-out has been announced.

AS-Interface integration and supply

The unit communicates natively over AS-Interface (no PROFIBUS or PROFINET onboard), making it a drop-in node for AS-i segmented fieldbus architectures. It provides 2 digital inputs for local sensors or pushbuttons, and includes a motor brake output component for controlled stopping of braked motors. Control supply is 20.4 to 26.4 V DC, which matches the standard AS-Interface power supply voltage range.

Mounting, environment, and protection

The enclosure measures 245 mm wide by 215 mm high by 205 mm deep and carries an IP54 protection class, meaning it is dust-protected and splash-resistant — suitable for installation inside a control cabinet or in a protected machine-mount location where occasional dust or condensation may occur.

Frequently asked questions

Where can I buy 3RK4320-3FQ51-0BA2 and how do I get a price?

We source this part to order against an RFQ. Submit a request for quote and we will confirm current availability and pricing at that time.

Can 3RK4320-3FQ51-0BA2 be used with PROFINET?

No, this unit supports AS-Interface protocol only. It does not have PROFINET or PROFIBUS DP onboard. For PROFINET integration, you would need a gateway or a different motor starter variant.

Does 3RK4320-3FQ51-0BA2 include a circuit breaker?

The unit is designed for use with circuit-breakers for short-circuit protection (listed as 'design of short-circuit protection: circuit-breakers'), but the circuit breaker itself is a separate component, not included in this motor starter MCU.

MPN
3RK4320-3FQ51-0BA2