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Deadband is also known as hysteresis and is the amount of a measured variable (pressure, temperature, etc.) between the point where a switch closes and then re-opens. It can be implemented is software if you have an analog input (i.e., open at 1.02 PSI, close at 0.98 PSI) or designed into a switching mechanism. Often the deadband of a switch is fixed and cannot be adjusted. A typical example is in a wall thermostat in your house.
Direct connection of an appliance that is not rated for use at 230V into a NZ socket-outlet is likely to result in a fire or electric shock hazard. In New Zealand, the outlets have switches on them so you can leave the piece of equipment plugged in but switch off the surge of electricity. Contrary to the US, the switch is down which means it is ON. A lot of New Zealand power outlet switches have a red mark on them it indicates the power is on.