A polycrystalline varistor of the bulk effect zinc oxide base type adapted for use in voltage surge suppression on VHF signal lines is disclosed. The device comprises a connector having a housing attached thereto containing a polycrystalline varistor and a conductive spring member. The spring member is configured to provide for the proper mechanical positioning of the varistor and to provide an electrical inductance in series with the varistor to prevent capacitive loading of the protected signal line.