What this SIRIUS direct starter does
The Siemens 3RK1315-6NS71-0AA0 is a SIRIUS direct starter rated for 4 kW at 400 V and 4 kW at 500 V, with a Trip Class 10 overload protection curve — meaning it trips within 10 seconds at 7.2× rated current, sized for standard induction motor starts without nuisance tripping on normal acceleration. It communicates via AS-Interface (not PROFIBUS or PROFINET) and provides 4 digital inputs for local sensors or pushbuttons, addressed through an M12 plug.
Supply and control voltage
The control supply is 24 V DC nominal, with a permissible range of 20.4 to 28.8 V DC, and a maximum of 31.6 V DC — stay within that window to avoid damaging the AS-Interface electronics. ON-delay is 25 ms, OFF-delay is 35 ms — fast enough for most conveyor and pump sequencing, but not for safety-rated stop categories that need faster break times.
Environmental limits and mounting
Shock rated at 12g for 11 ms, vibration at 7 mm / 2g — it holds up on a vibrating conveyor or crusher frame. Mounting is vertical, horizontal, or flat — screw-fixing through the 294 mm wide × 215 mm high × 159 mm deep body. The main circuit connects via a HAN Q4/2 plug per ISO 23570.