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Siemens 3RK4320-3KR51-0BA0 — Motor Starters

Siemens 3RK4320-3KR51-0BA0 SIRIUS MCU, 5 A AC-3

MPN3RK4320-3KR51-0BA0

Siemens SIRIUS motor starter MCU for AS-Interface, direct starter, 5 A at AC-3 400 V, Trip Class 10, IP55, 145 x 182 x 220 mm.

StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RK4320-3KR51-0BA0 — Identification
ParameterValue
Product designationmotor starter MCU for AS-Interface
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q

Protection & Tripping

3RK4320-3KR51-0BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)3.5 ... 5 A
Duty / utilization type (IEC 60947-6-2)1

Contacts & Control

3RK4320-3KR51-0BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical

Communication

3RK4320-3KR51-0BA0 — Communication
ParameterValue
AS-Interface protocol supportYes

Mechanical & Connection

3RK4320-3KR51-0BA0 — 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's a direct starter with electromechanical switching, rated 5 A at AC-3 400 V — that's the motor-load current it handles under full starting duty, not just resistive heating.

Integration into a panel or line

This unit mounts on a vertical surface with ±180° rotation possible and can tilt forward/backward ±22.5° — useful for tight enclosures where you need to angle the display or cable entry. The IP55 rating means it's dust-protected and handles water jets, so it's suited for washdown areas or outdoor cabinets where splash is a concern. It communicates over AS-Interface (the protocol is supported), not PROFINET or PROFIBUS DP, so verify your network master is AS-i capable.

Supply and control voltage

The control supply voltage is 20.4 to 26.4 V DC — that's the 24 V DC nominal range with tolerance. The main circuit operating voltage is 340 to 440 V AC, 50/60 Hz, covering 400 V line supplies. The 5 A AC-3 rating is the key figure for motor sizing: it's the current at 400 V under the heaviest switching category, so match it to your motor's full-load amps.

Frequently asked questions

What are the dimensions of 3RK4320-3KR51-0BA0?

Verifies physical fit in control panel for design engineers.

Is 3RK4320-3KR51-0BA0 compatible with Siemens SIRIUS soft starters?

Confirms integration in motor control systems for engineers and technicians.

What is the lead time for 3RK4320-3KR51-0BA0?

Critical for sourcing buyers managing BOM deadlines and production schedules.

Does 3RK4320-3KR51-0BA0 include a circuit breaker?

Clarifies built-in protection vs. external components needed for safe installation.

What is the replacement for 3RK4320-3KR51-0BA0 if obsolete?

Brokers and maintenance techs need cross-reference for lifecycle planning.

Can 3RK4320-3KR51-0BA0 be used with 24V DC control voltage?

Ensures compatibility with existing control system voltage for design and retrofit.

MPN
3RK4320-3KR51-0BA0