The Siemens 3RK1322-1BS02-1AA4 is a compact reversing starter in the AS-i system family — an electromechanical unit with bimetal motor protection, built for distributed motor control right at the machine. It's rated for 0.75 kW at AC-3 duty on 400 V, with a setting range of 1.4 to 2 A. The IP65 enclosure means it mounts directly on the machine frame or conveyor section, not inside a sealed panel — it handles washdown and wet-area deployment without an extra cabinet.
That's high for a compact unit and tells you it's designed for installations with substantial fault current available, typical of industrial mains. The AC-3 rating of 0.75 kW at 400 V governs motor switching — that's the load category for squirrel-cage motors during starting and plugging. The bimetal overload relay inside is set from 1.4 to 2 A, so the motor full-load current must fall inside that window. The brake output (500 V DC / 1 A) handles a DC brake coil directly, saving a separate contactor for holding brakes on conveyors or vertical axes. AS-interface protocol onboard means this starter communicates over a single two-wire bus carrying both power and data — no separate control cable bundle. It integrates two digital inputs locally, so you can wire limit switches or pushbuttons directly to the starter without a remote I/O block. The tab terminals for the main circuit are a fast-connect style common in distributed motor control.
Deployment context
IP65 lets this live on the machine frame in food processing, packaging lines, or cold storage — areas where washdown hoses and condensation are routine. Mounting is via the housing's own footprint (270 x 120 x 190 mm), with the 9-pole motor and power connections made through sealed glands or tab connectors.