The Siemens 3RK1322-0BS12-0AA1 is an AS-Interface compact starter — a self-contained direct-on-line (DOL) motor starter in an IP65 enclosure, designed for distributed motor control right at the machine, not in a central panel. It integrates solid-state motor protection and solid-state switching contacts, so there are no electromechanical contactors to wear out. The setting range covers 2 to 5.95 A, which translates to 0.75 to 2.2 kW at 400 V AC-3 duty (standard squirrel-cage motor starting). That 2.2 kW maximum at 400 V AC-3 is the rating that governs fit for a motor load — if your motor nameplate exceeds that, this starter is undersized. The unit communicates via AS-Interface protocol (AS-i), with bus communication built in, and includes two integrated inputs for local sensors or pushbuttons. It also has a motor brake output rated 24 V DC / 3 A for externally supplied brakes — common on vertical-axis conveyor or hoist applications where the brake must engage when power is removed.
Rated IP65, the 3RK1322-0BS12-0AA1 is built for washdown environments — food processing, packaging lines, or any area where hose-down cleaning is routine. The enclosure measures 270 mm high, 120 mm wide, and 190 mm deep, and mounts directly on the machine frame or a sub-panel, not on a DIN rail in a cabinet. Main power connects via tab terminals; the AS-i bus and sensor inputs use the integrated 9-pole power connector. The equipment marking per DIN EN 61346-2 is Q, the standard identifier for motor starters in schematic diagrams.