Wärtsilä SG 500

The Wärtsilä SG 500 is a high‑power, multi‑stage marine reduction gearbox designed to transmit up to 5 000 kW from the main engine to the propeller, offering compact modular construction and integrated lubrication; source-listed power 5000.0 kW, source-listed capacity 5000 kW rated. The supplied category identifies it as Reduction Gearbox, and it is normally installed between a propulsion engine or motor and the shaft line, reducing or adapting rotational speed and transmitting torque to the propeller. In that role, its primary purpose is to match prime-mover speed and torque to the propulsion shaft while providing the required clutching or reduction arrangement. Single-stage, multi-stage and epicyclic marine gearboxes differ in gear geometry and layout, but all depend on alignment, tooth contact, bearings and clean pressurized lubrication. Within the supplied list, this entry is distinguished from neighbouring variants by its model designation and the explicitly listed power and capacity; no further model-specific difference is stated in the source. No additional performance, approval or construction detail is inferred from the model code beyond the information supplied in the source record. For exact ratings, dimensions, settings, capacities, materials and variant-specific limits, refer to the manufacturer documentation for the exact figure.