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Siemens 3RK4340-3KR51-1BA0 — Motor Starters

Siemens 3RK4340-3KR51-1BA0 SIRIUS MCU Reversing Starter, 5 A

MPN3RK4340-3KR51-1BA0

Siemens SIRIUS MCU motor starter, reversing starter, I/O controlled, 5 A at AC-3 400 V, CLASS 10, IP55, 3RK4340-3KR51-1BA0.

Siemens 3RK4340-3KR51-1BA0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RK4340-3KR51-1BA0 — Identification
ParameterValue
Product designationmotor starter MCU, I/O controlled
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q
3RK4340-3KR51-1BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)3.5 ... 5 A
Duty / utilization type (IEC 60947-6-2)1
3RK4340-3KR51-1BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4340-3KR51-1BA0 — Communication
ParameterValue
AS-Interface protocol supportNo
3RK4340-3KR51-1BA0 — 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 is rated 5 A at AC-3 at 400 V, which is the motor-switching duty class: that 5 A figure governs the actual induction motor load it can switch, not a resistive-heater load. Bimetal motor protection set to CLASS 10. Rated operating voltage 340 to 440 V AC; control supply 20.4 to 26.4 V DC. The enclosure carries an IP55 rating, meaning it is dust-protected and resists water jets — suitable for installation in a panel on the machine, not just in a sealed cabinet.

Integration and mounting notes

No bus communication onboard — no PROFINET, PROFIBUS, or AS-Interface protocol support. Control is via hardwired I/O (the I/O controlled designation).

It carries a substance prohibitance date of 05/01/2012, which aligns with RoHS compliance — the part has been compliant for over a decade.

Frequently asked questions

Is 3RK4340-3KR51-1BA0 compatible with PROFINET or PROFIBUS?

No. This unit has no bus communication — it supports neither PROFINET, PROFIBUS, nor AS-Interface. It is an I/O-controlled motor starter, meaning control is via hardwired digital signals.

Where can I buy 3RK4340-3KR51-1BA0 and what is the price?

This Siemens SIRIUS reversing starter is sourced to order through independent distribution. Availability and pricing are confirmed at quote time against an RFQ.

MPN
3RK4340-3KR51-1BA0