What this reversing starter is and where it fits
The Siemens 3RK1300-1DS01-1AA3 is an electromechanical reversing starter from the SIRIUS EM 300 RS family, designed for distributed motor control in ET 200X environments. It integrates a reversing contactor pair, bimetal overload protection with a 2.2-3.2 A setting range, and a motor brake output into one IP65 enclosure — meaning it mounts directly on the machine frame or conveyor section, not back in a central panel. The IP65 rating lets it handle washdown and dusty environments on food, beverage, or packaging lines without a separate cabinet.
Rated motor power and what AC-3 means
Rated at 1.1 kW at 400 V in AC-3 duty (the standard category for squirrel-cage motor starting — switching under load but not during stall or reversal), this starter handles small three-phase motors typical of pumps, fans, and small conveyors. The operating voltage range is 400-500 V AC, so it covers 400 V and 480 V line supplies common in European and North American industrial plants.
PROFIBUS DP communication and brake integration
This unit supports PROFIBUS DP protocol, allowing direct fieldbus control from a PLC without hardwired start/stop/reverse signals — a key feature for distributed I/O architectures. The integrated motor brake output (for internally supplied DC brakes) saves an external brake rectifier and simplifies wiring on vertical-axis or holding-brake applications. The 9-pole motor feeder and 9-pole power connection are designed for pre-assembled cables, reducing field termination errors.
Short-circuit protection and coordination
The short-circuit protection design uses circuit-breakers, and the maximum short-circuit breaking capacity (Icu) at 400 V is rated at 50 A. That means the starter can safely interrupt a fault up to 50 A without upstream devices needing to clear it — important for selectivity studies on a distribution board. Ambient temperature range is 0-55 °C during operation, typical for enclosed machine-mounted gear without forced cooling.