Abstract: Provided is an electrical connector (10) comprising supply side and load side housings (12) and (30 that are connectable by means of female socket (22) and male plug (32). The connector (10) includes an AC input (14) with input protection (18) for receiving an AC supply (16), a primary rectifier arrangement (20) configured to rectify the AC input (14) to a DC input, a female socket (22) having a single layer air-cored supply coil (24) sealed within the socket (22), and a capacitor arranged in series with the supply coil (24) to form a series resonant LC arrangement (26). Also included is a half-bridge resonant converter switched mode power supply arrangement (28) supplied from the DC input and driving the supply coil (24) to produce a symmetrical AC waveform, said converter configured with a switching frequency substantially matched to a resonant frequency of the series resonant LC arrangement.