These devices are simply connected directly across the power supply. They have a very high resistance up to the Vm voltage shown in the table below and therefore usually may be ignored, but the moment a transient spike appears on the supply line which exceeds Vm, the impedance of the device drops immediately to a very low level while it dissipates the unwanted energy. For example, Suppressor 275Vac can be connected directly across the UK mains supply.
Please note that the use of AC in the d
