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Siemens 3RK4320-3GR51-1BA0 — Motor Starters

Siemens 3RK4320-3GR51-1BA0 SIRIUS Motor Starter, 2.5 A

MPN3RK4320-3GR51-1BA0

Siemens SIRIUS reversing motor starter MCU for AS-Interface, 3RK4320-3GR51-1BA0, 2.5 A at AC-3 400 V, CLASS 10, IP55, 340...440 V operating voltage.

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

3RK4320-3GR51-1BA0 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q
3RK4320-3GR51-1BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)1.8 ... 2.5 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3GR51-1BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3GR51-1BA0 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3GR51-1BA0 — 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

The Siemens 3RK4320-3GR51-1BA0 is a SIRIUS reversing motor starter MCU designed for AS-Interface bus communication. It integrates a reversing contactor and motor protection into one unit, so a single order code covers the forward/reverse switching and overload protection for a motor branch. The unit is current-production (lifecycle stage: current), so it remains a standard BOM line for new panels and replacement builds.

Integration and mounting notes

The 3RK4320-3GR51-1BA0 carries an IP55 protection class, so it is suited for installation in enclosures where dust and water jets are present — typical for washdown areas or outdoor cabinets. Dimensions are 145 mm deep, 182 mm wide, and 220 mm high. Plan for a panel cutout or DIN-rail footprint that accommodates this envelope plus clearance for the AS-Interface bus cabling and power wiring. The control supply voltage is 20.4 to 26.4 V DC.

Frequently asked questions

Is the 3RK4320-3GR51-1BA0 a reversing starter?

Yes, the product design is a reversing starter, meaning it integrates forward and reverse contactors plus motor protection in one housing.

Where can I buy the Siemens 3RK4320-3GR51-1BA0?

This part is sourced to order against an RFQ. Availability and pricing are confirmed at quote time.

MPN
3RK4320-3GR51-1BA0