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Siemens 3RK4320-3PQ54-0BA3 — Motor Starters

Siemens 3RK4320-3PQ54-0BA3 SIRIUS Motor Starter, 12 A AC-3

MPN3RK4320-3PQ54-0BA3

Siemens SIRIUS 3RK4320-3PQ54-0BA3, motor starter MCU for AS-Interface, direct starter, 12 A at AC-3/400 V, CLASS 10, IP54, 3-pole, with integrated brake control.

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

3RK4320-3PQ54-0BA3 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
3RK4320-3PQ54-0BA3 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)9 ... 12.5 A
Duty / utilization type (IEC 60947-6-2)1
3RK4320-3PQ54-0BA3 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4320-3PQ54-0BA3 — Communication
ParameterValue
AS-Interface protocol supportYes
3RK4320-3PQ54-0BA3 — 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

It's a direct starter with electromechanical switching contacts, rated 12 A at AC-3/400 V — that's the motor-load switching current, not a resistive-heater rating. The same 12 A holds at AC/400 V general rating. Short-circuit protection is handled by upstream circuit-breakers, not fuses. The unit includes a motor brake output for 400 V AC brake control — useful for holding loads on conveyors or vertical axes. It carries 2 digital inputs and operates on a control supply of 20.4 to 26.4 V DC. Enclosure rating is IP54 — splash-proof and dust-limited, suited for cabinet-mount or protected field locations, not open washdown zones.

Dimensions: 245 mm wide, 215 mm high, 205 mm deep. Three poles for the main current circuit. The AS-Interface bus connection handles both communication and power for the electronics — no separate control wiring for the bus, just the 24 V DC supply for the coil and auxiliaries.

No official replacement or successor order code has been published. If you're holding a BOM slot with this MPN, it's stable for the foreseeable future. For volume or scheduled deliveries, submit an RFQ for current pricing and lead time.

Frequently asked questions

Where can I buy the 3RK4320-3PQ54-0BA3?

This part is sourced to order against an RFQ through independent industrial distribution. Submit a request for current pricing and availability — we confirm both at quote time.

What is the difference between SIRIUS 3RK4 and 3RK2?

The 3RK4 series is the AS-Interface bus-capable motor starter platform, while 3RK2 is an earlier generation without integrated bus communication. The 3RK4320-3PQ54-0BA3 includes onboard AS-Interface protocol support and 2 digital inputs.

MPN
3RK4320-3PQ54-0BA3