... against: Low, High voltage, spikes and surges A/C GUARD 16A, 20A, 25A AVS with Over- ... Automatic protection against: Low, High voltage, spikes and surgesIntelligent time delay, protection against power back surgesCircuit ... , direct wiring for extra securityAvailable in 16A, 20A and 25A Nominal Voltage230VCurrent Rating16,20,or 25AmpsFrequency50 ... Guard Sollatek Voltage Protection in 16A, 20A and 25A