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Siemens 3RK4340-3NR51-1BA0 — Motor Starters

Siemens 3RK4340-3NR51-1BA0 SIRIUS Motor Starter, 10 A

MPN3RK4340-3NR51-1BA0

Siemens SIRIUS motor starter MCU, I/O controlled, reversing design, rated 10 A at 400 V AC-3, Trip Class 10, IP55, 340–440 V operating voltage.

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

Specifications

3RK4340-3NR51-1BA0 — Identification
ParameterValue
Product designationmotor starter MCU, I/O controlled
Main circuit poles3
BrandSIRIUS
Product design / constructionreversing starter
Reference designation (IEC 81346-2)Q
3RK4340-3NR51-1BA0 — Protection & Tripping
ParameterValue
Trip classCLASS 10
Overload release setting range (current)7 ... 10 A
Duty / utilization type (IEC 60947-6-2)1
3RK4340-3NR51-1BA0 — Contacts & Control
ParameterValue
Switching contact typeelectromechanical
3RK4340-3NR51-1BA0 — Communication
ParameterValue
AS-Interface protocol supportNo
3RK4340-3NR51-1BA0 — 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

What this reversing starter nails for the cure recipe

The bimetal design is electromechanical, not electronic, so it holds up to the steam and vibration of industrial environments without firmware glitches. Rated for a 340–440 V operating voltage at 50/60 Hz. The control supply is 20.4–26.4 V DC.

Mounting and environment — rated for press temperatures

IP55 protection means the enclosure resists dust and water jets — suitable for washdown areas or outdoor cabinets, though not submerged. The ambient temperature range of -25 to +35 °C covers most control rooms and unheated plant floors, but derate above 35 °C if the panel sits near a curing press or oven. This lets you fit it into tight enclosures or angled subpanels without worrying about orientation limits. The short-circuit protection is designed for circuit-breakers, not fuses, so coordinate with a suitable motor-protective circuit-breaker upstream. No PROFIBUS, PROFINET, or AS-Interface onboard — this is a hardwired I/O-controlled unit, not a networked fieldbus device.

Frequently asked questions

Where can I buy 3RK4340-3NR51-1BA0?

This part is sourced to order against your RFQ. Availability and pricing are confirmed at quote time.

MPN
3RK4340-3NR51-1BA0