The Siemens 3RK1395-6KS71-3AD5-Z E09 is a SIRIUS M200D Technology Module configured as a reversing motor starter — electronic switching in AC-3 duty, rated 0.15 to 2.00 A and 0.75 kW at 400 V. The integrated thermistor (THERMOCLICK / PTC) input gives direct motor temperature feedback, so you catch a winding overheat before the overload curve alone would. A brake contact rated at 180 V DC is included, which saves an external contactor on applications with spring-set brakes — conveyors, gantries, vertical axes. The module carries 4 digital inputs and 2 digital outputs, and connects via Han Q4/2 and Han Q8/0 connectors. It communicates on PROFIBUS or PROFINET through a separate communication module (3RK1305*). Manual on-site operation with a key-operated switch is built in, so you can jog or isolate the starter locally during commissioning without reaching for a laptop. That matters when you're on a ladder at 2 AM trying to index a turntable.
What the ratings mean in practice
The 0.15 to 2.00 A current range covers small reversing applications — think 0.37 kW to 0.75 kW motors at 400 V three-phase. The electronic overload is adjustable across that range, so one module fits multiple motor sizes on the same line, which simplifies spares stocking. The brake contact at 180 V DC handles most spring-set brakes on small servo and induction motors; verify your brake coil voltage matches before wiring. The four digital inputs and two digital outputs give you local feedback and control without pulling extra I/O from the PLC. Typical use: two inputs for forward/reverse commands, one for a limit switch, one for a fault reset; outputs can drive a status lamp or a brake release confirmation. The Han connectors (Q4/2 and Q8/0) are a mixed power/signal interface — you'll need the matching cable sets for a clean panel build.
The Han connectors mean pre-fabricated cables are available, which speeds up panel wiring versus terminal-by-terminal termination. Manual on-site operation with a key switch is a commissioning time-saver: you can test direction and brake release without the PLC online.