AS-i compact DOL starter for distributed motor control
The Siemens 3RK1322-0KS02-0AA4 is a SIRIUS AS-i compact direct-on-line starter — an electromechanical DOL starter with bimetal motor protection, rated 0.37 kW at AC-3 400 V, and a setting range of 0.9 to 1.25 A. It integrates the motor starter, overload relay, and AS-interface bus communication into a single IP65 enclosure, so it mounts directly on the machine frame or conveyor section without a separate control panel. The 0.37 kW rating at AC-3 400 V means it switches standard three-phase induction motors up to that output under normal starting duty — the load type that governs contactor selection for most conveyor, pump, and fan applications. The bimetal overload element provides Class 10 motor protection against sustained overcurrent, with the trip curve set by the 0.9-1.25 A adjustment range.
IP65 enclosure and field-mount integration
Rated IP65, the enclosure seals against dust ingress and low-pressure water jets from any direction — suitable for washdown environments in food-and-beverage, packaging, or automotive assembly lines where hose-down cleaning is routine. The housing measures 270 mm high by 120 mm wide by 190 mm deep, with tab terminals for the main current circuit and a 9-pole motor outgoing feeder plus 9-pole power connection. The ambient operating range of -25 to +55 °C covers unheated factory bays and refrigerated areas; no derating is required within that band for the bimetal trip curve.
Integrated brake contact and AS-i bus
A motor brake output is built in — rated 500 V DC / 1 A — so holding brakes on vertical-load axes (hoists, gantries, vertical conveyors) can be controlled directly without an external brake rectifier or contactor. The AS-interface protocol is onboard, with two integrated inputs for local sensors or pushbuttons; PROFIBUS DP is not supported on this variant. The 50 kA short-circuit breaking capacity (Icu) at 400 V means this starter safely interrupts fault currents up to that level without upstream fuses or breakers needing to clear the fault — important for high-fault-capacity installations where the available fault current at the motor exceeds typical distribution panel ratings.