Air conditioner switch 30amps automatic voltage protector 100%quality guarantee made in england specifcation: model bx-v150. work voltage:220v 50/60hz. current 30amps. delay time 5s/180s over voltage 230-280v(adjust) material fireproofp pc. installing process.1 wired the protector: o:l(live wire output). o:l(neutral wire output. g(grounding). in:l(live wire input).2 open the switch. if voltage is normal, when it is first connecting to the power, it will count backwards from 5s first,then output normal, the green light will be on.set high voltage: long press the setting button,at same time, to click plus button to adjust high voltage, when the display shows 5,loose the setting button,then set high voltage from 230-280 by plus or minus button.set low voltage: long press the setting button,at same time, to press plus button to adju.