What the 53 kA SCCR means for your panel
The 3RA6400-2BB42 is a SIRIUS compact starter for IO-Link — a direct starter that integrates a contactor and overload relay in a 45 mm wide package. The 24 V DC coil holds continuous; drop-out is clean below the undervoltage threshold.
Trip class and motor protection — adjustable 10/20
Trip class is adjustable between CLASS 10 and CLASS 20. That means the same starter handles both standard motor starts (class 10, faster trip for shorter acceleration) and high-inertia loads like fans or conveyors (class 20, allows longer start time before tripping). No need to swap the overload block — just dial it in. The 1.25 A rated operational current at 400 V AC sizes it for small motors, about 0.5 hp at 460/480 V.
IO-Link and wiring — spring terminals, COM2
IO-Link communication runs at COM2 (38.4 kBaud), giving you parameterization and diagnostics down to the device level — useful for a spare where you need to confirm settings without opening the panel. Strip length 8 mm, no re-torquing needed. Three onboard LEDs indicate status at a glance.