The Siemens 3RK1395-6KS71-2AD0 is a SIRIUS direct motor starter rated for 0.75 kW at 400 V (0.7 hp at 460/480 V), with a 2 A AC-3 current rating at 400 V. The trip class is field-selectable among CLASS 5, 10, 15, and 20 — that means you match the overload protection to the motor's start-up profile: fast tripping for short acceleration times (CLASS 5), or a longer window for high-inertia loads like fans or centrifuges (CLASS 20). The unit is a direct starter (no reversing), so it's a straightforward on/off control for a single-direction motor. It carries an IP65 enclosure, meaning the housing and the HAN Q4/2 power connector are sealed against dust and low-pressure water jets — suitable for washdown areas or outdoor cabinets where a standard open starter would need a separate enclosure. The supply voltage is 24 V DC (20.4 to 28.8 V range), so it drops into a standard 24 V control circuit without a separate power supply. The starter includes 4 digital inputs and 2 digital outputs, letting you wire start/stop pushbuttons, limit switches, or a PLC directly without an extra I/O block. The ON-delay is 25 ms and the OFF-delay is 35 ms — these are the response times of the internal logic, not the contactor dropout, so they matter when sequencing multiple starters in a timed cascade.
Mounting, environment, and panel integration
The starter measures 294 mm wide, 215 mm high, and 148 mm deep. The recommended mounting position is horizontal, but it also works vertical or flat — the orientation affects heat dissipation, so if you mount it vertical, check that the ambient stays within the -25 to +55 °C operating range. Vibration resistance is 7 mm at 2g, shock resistance is 12g for 11 ms — typical for a machine-mounted starter on a conveyor or pump skid.