Heat sink for a high voltage switchgear

A heat sink for a switchgear, the heat sink is configured to cool parts of the switchgear, the heat sink is made from an electrically conductive material, and the heat sink comprises:

• a body,
• wherein the body is centered around a central axis that extends in an axial direction from a first outer surface portion of an outer surface of the body to a second outer surface portion of the body,
• wherein at least one third outer surface portion of the body extends from the first outer surface portion to the second outer surface portion,
• wherein a plurality of air channels extend through the body from the first outer surface portion to the second outer surface portion and are located within the body,
• wherein the plurality of air channels comprise a central air channel and three arcuate air channels,
• wherein the air channels are surrounded by the at least one third outer surface portion,
• wherein each of the air channels comprise a respective ribbed surface,
• wherein the respective ribbed surface of each of the air channels extends from the first outer surface portion to the second outer surface portion,
• wherein each of the three arcuate air channels has a respective radius of curvature centered along the central axis,
• wherein the respective radius of curvature is different between the three arcuate air channels, and
• wherein the three arcuate air channels are spaced apart from each other in a radial direction from the central axis.