5 A at AC-3, CLASS 10 — what that means on the line
The 3RK4340-3KR51-0BA0 is a SIRIUS MCU motor starter — an I/O-controlled direct starter that handles a 5 A motor load under AC-3 duty at 400 V. The operating voltage range is 340 to 440 VAC, so it sits comfortably on a 400 V three-phase line. Control supply is 24 VDC, nominal range 20.4 to 26.4 V.
IP55 enclosure — washdown-ready, but check the temperature window
IP55 gives dust protection and water jets from any direction, so this starter can live on a machine frame in a washdown zone or a dusty panel — no separate enclosure needed for most food-and-bev or aggregate environments. But the ambient temperature window is -25 to +35 °C during operation; above 35 °C you need to derate or ventilate.