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Siemens 3RK4320-3ER51-1BA0 — Motor Starters

Siemens 3RK4320-3ER51-1BA0 SIRIUS Reversing Starter, 1.6 A

MPN3RK4320-3ER51-1BA0

Siemens SIRIUS 3RK4320-3ER51-1BA0 reversing motor starter, 1.6 A AC-3 at 400 V, Class 10, IP55, AS-Interface communication, 145 x 182 x 220 mm.

Siemens 3RK4320-3ER51-1BA0 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

3RK4320-3ER51-1BA0 — 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

3RK4320-3ER51-1BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)1.1 ... 1.6 A
Duty / utilization type (IEC 60947-6-2)1

Contacts & Control

3RK4320-3ER51-1BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical

Communication

3RK4320-3ER51-1BA0 — Communication
ParameterValue
AS-Interface protocol supportYes

Mechanical & Connection

3RK4320-3ER51-1BA0 — 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

Mounting and enclosure fit

The 3RK4320-3ER51-1BA0: The unit measures 145 mm deep, 182 mm wide, and 220 mm high — a compact footprint for a reversing starter with integrated bus communication. It mounts on a vertical surface with ±180° rotation possible and can be tilted forward or backward by ±22.5°, giving panel builders flexibility in tight enclosures.

Supply and control voltages

The main circuit operates at 340-440 V AC, 50/60 Hz. The control supply is 20.4-26.4 V DC — a standard 24 V DC nominal rail with ±10% tolerance. The AS-Interface protocol is supported natively, so no external gateway module is needed for AS-i bus integration.

Frequently asked questions

How do I get pricing and availability for 3RK4320-3ER51-1BA0?

Submit an RFQ through this listing.

What is the AC-3 motor rating at 400 V?

The AC-3 rated current at 400 V is 1.6 A. This is the switching current for motor loads — the value that determines whether the starter can handle your motor's full-load amps during start and run.

MPN
3RK4320-3ER51-1BA0