What it is and what it does
The Siemens 3RK1322-1ES02-1AA1 is an AS-interface compact reversing starter in an IP65 enclosure — a self-contained motor control unit for reversing applications that combines a reversing contactor, bimetal overload relay, and AS-i bus communication in one housing. Rated for 1.5 kW at 400 V AC-3 duty, it handles reversing motor loads like conveyors, hoists, or gate drives where direction change is needed. The bimetal overload protection is set via a 2.8 to 4 A adjustment range, matching the motor full-load current. The IP65 rating means the entire assembly — contacts, overload, and electronics — is sealed against dust and low-pressure water jets, so it mounts directly on the machine frame or in a washdown zone without a separate control cabinet.
Key ratings and what they mean for fit
The 50 kA short-circuit breaking capacity (Icu) at 400 V means this starter can safely interrupt a fault current up to that level without catastrophic failure — critical for coordination with upstream protection devices in industrial distribution. Operating temperature range of -25 to +55 °C covers most factory-floor environments, including unheated warehouses and outdoor enclosures in temperate climates. The integrated motor brake output (24 V DC / 3 A) saves an external brake rectifier or relay for motors with spring-applied brakes — common on vertical-axis drives. AS-interface protocol onboard means this starter connects directly to an AS-i network without a separate gateway module, reducing wiring and cabinet space. No PROFIBUS DP option here — this is an AS-i-native device.
Mounting and connections
Dimensions of 270 mm high, 120 mm wide, and 190 mm deep. The IP65 housing is designed for direct machine mounting — no DIN rail, no enclosure needed. Main circuit connections use tab terminals; the 9-pole motor and power connectors are pre-wired for quick replacement. Two integrated inputs allow local pushbuttons or sensors to be wired directly, reducing the need for remote I/O drops.
Lifecycle and sourcing
For BOM-line sourcing, the 2.8 to 4 A setting range and 1.5 kW AC-3 rating are the critical fit parameters. Verify the motor FLA falls within that window and the AS-i network is already in place. Quoted to order against an RFQ.