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Siemens 3RK4320-3JQ54-1BA2 — Motor Starters

Siemens 3RK4320-3JQ54-1BA2 SIRIUS Motor Starter, 4 A AC-3

Name: 3RK4320-3JQ54-1BA2
Brand: Siemens
SKU: 3RK4320-3JQ54-1BA2
Availability: LimitedAvailability
Author: Old Mike

MPN3RK4320-3JQ54-1BA2

Siemens SIRIUS 3RK4320-3JQ54-1BA2 reversing motor starter, 4 A AC-3 at 400 V, Class 10, IP54, AS-Interface bus, 205 x 245 x 215 mm.

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Siemens 3RK4320-3JQ54-1BA2 datasheet (PDF)

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Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

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Specifications

Identification

3RK4320-3JQ54-1BA2 — Identification
Parameter	Value
Product designation	motor starter MCU for AS-Interface
Main circuit poles	3
Brand	SIRIUS
Product design / construction	reversing starter
Reference designation (IEC 81346-2)	Q

Protection & Tripping

3RK4320-3JQ54-1BA2 — Protection & Tripping
Parameter	Value
Trip class	CLASS 10
Overload release setting range (current)	2.8 ... 4 A
Duty / utilization type (IEC 60947-6-2)	1

Contacts & Control

3RK4320-3JQ54-1BA2 — Contacts & Control
Parameter	Value
Switching contact type	electromechanical

Communication

3RK4320-3JQ54-1BA2 — Communication
Parameter	Value
AS-Interface protocol support	Yes

Mechanical & Connection

3RK4320-3JQ54-1BA2 — Mechanical & Connection
Parameter	Value
Main circuit connection type	screw-type terminals
Mounting position	+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface
Width	245 mm
Height	215 mm
Depth	205 mm

Product details

Reversing starter with AS-Interface — 4 A AC-3, Class 10

The Siemens 3RK4320-3JQ54-1BA2 is a SIRIUS reversing motor starter designed for AS-Interface bus communication. The unit integrates two digital inputs, a motor brake output, and short-circuit protection via circuit-breakers.

Panel fit and environmental rating

The enclosure carries an IP54 rating — protected against dust ingress and splashing water, suitable for control cabinets in industrial environments where washdown is not direct. Ambient operating range is -25 to +50 °C.