What this reversing starter is and where it fits
The Siemens 3RK1395-6LS71-1AD3 is a SIRIUS reversing starter rated for 5.5 kW at 400 V AC, with a trip class selectable among CLASS 5, 10, 15, or 20. It is housed in an IP65 enclosure, so it can be mounted directly on a machine frame or in a washdown zone without a separate panel enclosure. The unit provides 4 digital inputs and 2 digital outputs for local control and status feedback.
Key ratings and what they mean for fit
The 5.5 kW rating at 400 V (12 A) covers most standard 3-phase induction motors in that power class — pumps, fans, small conveyors. The selectable trip class (5, 10, 15, or 20) lets you match the overload protection to the motor's starting characteristics: Class 5 for submersible pumps or high-inertia loads that need fast trip, Class 20 for soft-start or long acceleration profiles. The IP65 rating means the enclosure is dust-tight and protected against low-pressure water jets — suitable for food processing, packaging lines, or outdoor installations without a secondary cabinet.
Mounting and integration
The starter measures 294 mm wide, 215 mm high, and 148 mm deep. It is fastened via screw fixing and can be mounted vertically, horizontally, or flat. The main circuit connection uses a plug according to ISO 23570 (HAN Q4/2), which simplifies pre-wiring and replacement. The unit is rated for shock resistance of 12g / 11 ms and vibration resistance of 7 mm / 2g, so it holds up on moving machine parts or in transport.