Abstract: A power line/transformer switch of the isolator type, with knife members for the respective phases disposed on a common, rotatable shaft of insulating material. The respective contacts for the knives are disposed on an opposing, fixed shaft composed of insulating material. The respective shafts are mounted at one end of supports that are joined at the opposite end such that the supports constitute the legs of a V-shaped frame. The base of the V-formed supports is disposed perpendicularly on the longitudinal support bar that is parallel with the shafts, this longitudinal bar being provided with fasteners for attachment to a tower.