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Siemens 3RK4320-3BQ54-0BA3 — Motor Starters

Siemens 3RK4320-3BQ54-0BA3 SIRIUS Motor Starter, 0.8 A AC-3

MPN3RK4320-3BQ54-0BA3

Siemens SIRIUS 3RK4320-3BQ54-0BA3 motor starter MCU, direct starter, 0.8 A at 400 V AC-3, CLASS 10, AS-Interface communication, IP54, 205 x 245 x 215 mm.

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

3RK4320-3BQ54-0BA3 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RK4320-3BQ54-0BA3 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)0.55 ... 0.8 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3BQ54-0BA3 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3BQ54-0BA3 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3BQ54-0BA3 — 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

0.8 A AC-3 motor duty with CLASS 10 bimetal protection

The 3RK4320-3BQ54-0BA3: It communicates over AS-Interface (the protocol is supported per the spec), so it drops into an AS-i fieldbus slice without a separate gateway module for the motor starter. The control supply is 20.4–26.4 V DC, which is the standard AS-i bus voltage range.

Panel fit and mounting flexibility

The enclosure measures 205 mm deep, 245 mm wide, and 215 mm high — the depth is the dimension that matters most when the panel depth is tight against a backplate or gland plate. IP54 means it handles dust and splashing water in a cabinet environment, but not washdown.

Integrated brake output and short-circuit protection

This unit includes a motor brake output (400 V AC) — the brake coil is switched directly from the starter, saving a separate contactor for the brake on a hoist or conveyor application. Short-circuit protection is designed for use with circuit-breakers, not fuses, so coordinate the upstream breaker to the starter's let-through. The starter is a direct starter design with electromechanical switching contacts, and it has 2 digital inputs for local control or feedback.

Current production — quoted to order

Sourced through authorized distribution channels.

Frequently asked questions

What does the CLASS 10 trip rating mean for motor protection?

This protects standard induction motors during a locked-rotor condition without tripping on a normal acceleration start.

MPN
3RK4320-3BQ54-0BA3