The AVS30 is an Automatic Voltage Switcher, Its rated current is 30 Ampere. It will switch off the equipment connected to it if the main power goes outside preset acceptable limits and will reconnect automatically - when the mains power returns to normal. Re-connection takes place after a delay ('the start-up delay') to ensure the stability of the mains. In addition, the start-up delay protects against power-back surges commonly experienced after the resumption of power in a power-cut situation. Meanwhile, surge and spike protection is also incorporated to ensure protection against these commonly occurring events.