AN ELECTRICAL SWITCH FOR AN ON-LOAD TAP CHANGER

An electrical switch (1) for an on-load tap changer (2), said electrical switch (1) comprising: at least three electrical contacts (3a, 3b, 3c) connected to a respective electrical conductor (4a, 4b, 4c), a switch means (5) configured to be movable between a plurality of positions (P1, P2), wherein the switch means (5) in each respective position (P1, P2) physically contacts a respective combination (C1, C2) of said electrical contacts (3a, 3b, 3c) to provide electrical contact between the electrical contacts in each respective combination (C1, C2) of electrical contacts (3a, 3b, 3c), a hermetically sealed housing (6) providing an inner space (7) enclosing the electrical contacts (3a, 3b, 3c) and the switch means (5), said electrical conductors (4a, 4b, 4c) extending from the electrical contacts (3a, 3b, 3c) inside the inner space (7) of the housing (6) to an outside of the housing (6), and a control means (10) configured to control movement of the switch means (5). The inner space (7) is under vacuum or is filled with an arc suppression gas.