A circuit breaker, or transformer, or insulated bus for use with AC voltages greater than 30 kilovolts and AC currents greater than 400 amperes includes an elongated bushing made from electrically insulating material and having a first end adapted to be coupled to a main enclosure of the circuit breaker, or transformer, or insulated bus. An elongated extruded radiator has a first end coupled to the second end of the bushing and a second end. A terminal pad is coupled to the second end of the extruded radiator. An electrical conductor is disposed in internal cavities of the bushing and the extruded radiator in spaced relation to internal walls of the bushing and the extruded radiator that define the internal cavities. One end of the conductor is electrically connected to the terminal pad.