What this reversing starter is and where it fits
The Siemens 3RK1315-6LS41-3AA0 is a SIRIUS reversing motor starter — a self-contained unit that combines a contactor pair and overload relay in one IP65 enclosure, ready for direct-on-line reversing of three-phase motors. It is rated 5.5 kW at 400 V (7.5 hp at 460/480 V, 10 hp at 575/600 V) with Trip Class 10 thermal protection, meaning it trips within 10 seconds at 7.2× rated current — standard for general-purpose motor starting where the rotor is up to speed quickly. The IP65 rating means the enclosure is dust-tight and protected against low-pressure water jets — suited for washdown areas, outdoor installations, or environments where a standard open starter would need a separate cabinet. The screw-fixing mounting and 294 × 215 × 159 mm (W×H×D) footprint let it bolt directly to a machine frame or wall bracket without a sub-panel.
Ratings that govern the fit
Supply voltage is 24 V DC (20.4 to 28.8 V range, maximum permissible 31.6 V). The control circuit draws from a standard 24 V DC bus; verify the power supply can deliver the inrush of the two contactor coils during reversing transitions. On-delay is 85 ms, off-delay 65 ms — fast enough for most reversing duty, but not for high-speed jogging applications. Four digital inputs are available on the M12 plug for device addressing. The main power circuit connects via a HAN Q4/2 plug per ISO 23570. Communication is AS-Interface only — no PROFIBUS or PROFINET on this variant. If your network is AS-i, this starter integrates directly; for other fieldbuses, you need a gateway. Ambient operating range is -25 to +55 °C; storage and transport range -40 to +70 °C. Shock resistance is 12 g / 11 ms, vibration resistance 7 mm / 2 g — robust for machine-mounted applications on conveyors, pumps, or fans. Pollution degree 3 means it tolerates conductive pollution in industrial environments.