Surge Protective Devices (SPD) are used to protect the electrical installation, which consists of the consumer unit, wiring and accessories, from electrical power surges.They are designed to protect against transient surge conditions and to prevent damage of electronic or electrial equipments from voltage spikes or transients. There are three types of SPD namely Type 1, Type 2 and Type 3.
- Type 1 SPD installed at the origin, e.g. main distribution board.
- Type 2 SPD installed at sub-distribution boards
- (Combined Type 1 & 2 SPDs are available and are usually installed in consumer units).
- Type 3 SPD installed close to the protected load. They must only be installed as a supplement to Type 2 SPD.
Different kinds of SPDs are available in the market. SPD's of Phoenix Contact are popular in Nepal. E.Store Pvt. Ltd. is selling all kinds of SPD's through it's online store www.estore.com.np