The Siemens SIRIUS 3RK1325-6LS41-1AA0 is a reversing motor starter designed for direct-on-line reversing of three-phase motors up to 5.5 kW at 400 V (7.5 hp at 460/480 V, 10 hp at 575/600 V). It's an IP65-rated unit with an AS-Interface fieldbus interface, four digital inputs, and selectable trip classes 5, 10, 15, or 20 — meaning you can match the overload protection curve to the motor's thermal time constant. The 24 V DC supply (20.4–28.8 V range) powers both the control logic and the coil, so it's a single-voltage drop for the cabinet builder.
The 10 hp at 575/600 V tells you it handles higher-voltage North American supplies without derating — useful for a panel that crosses IEC and UL territories. Trip class selection (5, 10, 15, 20) lets you set the overload relay's thermal memory: Class 5 for short-time protection on submersible pumps, Class 20 for high-inertia loads like centrifuges. The IP65 enclosure means it's sealed against dust and low-pressure water jets — mount it directly on the machine frame in a washdown zone without a separate cabinet.
Mounting is via screw fixing (not DIN rail), with a footprint of 294 mm wide by 215 mm high by 159 mm deep. It can be installed vertically, horizontally, or flat — the horizontal orientation is recommended for optimal heat dissipation. The main circuit connects through a HAN Q4/2 plug (ISO 23570), and the AS-Interface addressing is done via an M12 plug. Four digital inputs are onboard for local sensors or pushbuttons, reducing the need for a separate I/O block.