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Siemens 3RK4320-3JQ51-1BA2 — Motor Starters

Siemens 3RK4320-3JQ51-1BA2 SIRIUS Motor Starter, 4 A AC-3

MPN3RK4320-3JQ51-1BA2

Siemens SIRIUS 3RK4320-3JQ51-1BA2, reversing motor starter with integrated brake control, 4 A rated operational current at AC-3 400 V, AS-Interface communication, CLASS 10 bimetal overload protection, IP54 enclosure.

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

Specifications

3RK4320-3JQ51-1BA2 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q
3RK4320-3JQ51-1BA2 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)2.8 ... 4 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3JQ51-1BA2 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3JQ51-1BA2 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3JQ51-1BA2 — 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

Rated 4 A at AC-3 400 V, it handles reversing duty for small motors up to that current — think conveyor direction changes or pump valve positioning. This is a current-production part (lifecycle stage: current). It ships with AS-Interface onboard — no add-on gateway needed — and carries a brake control output for holding brakes typical on vertical-axis loads. The IP54 enclosure suits it for panel-mount in industrial environments where dust and splash are present, but not for direct washdown zones.

The 4 A AC-3 rating at 400 V governs the motor it can switch: that's the full-load current of a roughly 2.2 kW / 3 hp induction motor on a 400 V three-phase line. The control supply is 20.4 to 26.4 V DC, so it runs off a standard 24 V DC control bus. The main power circuit operates on 340 to 440 V AC at 50 or 60 Hz — covers the usual 400 V three-phase industrial supply with tolerance for sag. The 80 operations per hour maximum frequency means it is sized for occasional reversing cycles, not high-speed jogging.

The 245 mm width × 205 mm depth × 215 mm height footprint means it occupies a substantial slice of backplane; plan the gland plate and wireway accordingly. Two digital inputs are onboard for local control or feedback. AS-Interface is the only fieldbus onboard — no PROFIBUS or PROFINET variant here. If the line runs on PROFINET, this unit needs a gateway or a different SIRIUS variant. The brake output is for 24 V DC holding brakes, not 180 V DC or 400 V AC brake types, so verify the brake coil voltage before specifying.

Frequently asked questions

Where can I buy 3RK4320-3JQ51-1BA2 available via RFQ confirmation?

This part is sourced to order; availability and pricing are confirmed at quote time. Contact our sales team for current lead time and pricing.

MPN
3RK4320-3JQ51-1BA2