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Siemens 3RK4320-3GR51-0BA0 — Motor Starters

Siemens 3RK4320-3GR51-0BA0 SIRIUS Motor Starter

MPN3RK4320-3GR51-0BA0

Siemens SIRIUS motor starter MCU for AS-Interface, 3RK4320-3GR51-0BA0, direct starter, 2.5 A AC-3 at 400 V, CLASS 10, IP55, DC control supply 20.4-26.4 V.

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

3RK4320-3GR51-0BA0 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RK4320-3GR51-0BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)1.8 ... 2.5 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3GR51-0BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3GR51-0BA0 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3GR51-0BA0 — 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

It integrates motor protection via a bimetal overload relay (CLASS 10 trip class) and short-circuit protection through circuit-breakers, all in one IP55-rated enclosure sized at 182 x 220 x 145 mm (W x H x D). Rated at 2.5 A in AC-3 duty at 400 V, this starter handles motor loads up to that current — typical for small conveyors, pumps, or fans on a 50/60 Hz line. Communication is over AS-Interface (the protocol is supported), with a DC control supply of 20.4 to 26.4 V powering the electronics. The operating voltage range is 340 to 440 V AC, so it fits 400 V class three-phase systems common across European and Asian industrial panels.

This flexibility helps when fitting into existing enclosures where the gland plate or busbar layout forces an angled install — common in retrofit or tight panel builds. IP55 means the enclosure is dust-protected and resists water jets from any direction, so it can live in washdown areas or outdoors under a roof. The 182 mm width and 220 mm height fit standard 600 mm wide enclosures with room for side-by-side starters and cable ducts.

Frequently asked questions

Does 3RK4320-3GR51-0BA0 include a circuit breaker?

The design of short-circuit protection uses circuit-breakers, but the unit itself is a motor starter MCU — the circuit-breaker is integrated as part of the device's short-circuit protection scheme, not a separate external breaker.

MPN
3RK4320-3GR51-0BA0