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The AVS protects from Power cuts Sags(under-voltage dip or brownout) Surges(swell or over-voltage) Power-back surges...... Automatic Voltage Switcher The AVS principle For complete protection simply plug the Automatic Voltage Switcher into the mains and plug in your appliances. When the mains power supply fluctuates outside pre-set tolerances (nominally 190V and 260V) the power to your equipment ...