PD Devices Surge Protection Devices (SPDs) are designed to limit transient overvoltages of atmospheric origin and divert current waves to earth, so as to limit the amplitude of this overvoltage to a value that is not hazardous for the electrical installation, electric switchgear and controlgear.
We offer many different Surge Protection Devices for the building industry;
Type 1, Type 2, Type 3, All Mode Protection, Surge Filters and Equipotential Bonding SPDs
SPD eliminates overvoltages in common mode, between phase and neutral or earth; in differential mode, between phase and neutral.
In the event of an overvoltage exceeding the operating threshold, the SPD conducts the energy to earth, in common mode; distributes the energy to the other live conductors, in differential mode.