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Siemens 3RK4320-3HR51-0BA0 — Motor Starters

Siemens SIRIUS 3RK4320-3HR51-0BA0 AS-Interface Motor Starter

MPN3RK4320-3HR51-0BA0

Siemens SIRIUS motor starter MCU for AS-Interface, 3RK4320-3HR51-0BA0, direct starter, 3.2 A AC-3 at 400 V, CLASS 10, IP55, 24 V DC control supply.

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

3RK4320-3HR51-0BA0 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RK4320-3HR51-0BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)2.2 ... 3.2 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3HR51-0BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3HR51-0BA0 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3HR51-0BA0 — 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

AS-Interface motor starter with integrated overload protection

The CLASS 10 trip curve matches the acceleration profile of most general-purpose pumps, fans, and conveyors, clearing a locked-rotor condition before the motor insulation takes damage.

AS-Interface integration and control supply

This unit communicates natively over AS-Interface (the only protocol supported), so it drops straight into an AS-i network without a gateway for the motor starter segment. The control supply is 24 V DC (20.4... 26.4 V), which is the standard AS-Interface bus voltage — no separate 24 V power supply needed if the AS-i power supply is already in the cabinet. The operating voltage for the main power circuit is 340... 440 V, covering 400 V nominal systems with typical tolerance.

Frequently asked questions

What is the trip class of 3RK4320-3HR51-0BA0?

The trip class is CLASS 10, meaning it will trip within 10 seconds at a locked-rotor current — suitable for standard induction motor starting profiles.

Can 3RK4320-3HR51-0BA0 be used with 24 V DC?

Yes, the control supply voltage is 24 V DC (20.4... 26.4 V), which is the standard AS-Interface bus voltage.

Where can I buy 3RK4320-3HR51-0BA0?

This part is sourced to order against an RFQ through independent distribution. Submit a request for current availability and pricing.

MPN
3RK4320-3HR51-0BA0