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Power Line Surge Protective Device
Product details
A device that reduces the voltage level of high-energy electrical systems, protecting against large external surges such as lightning strikes and electrical switching operations. There are two connection arrangements:
1) Parallel (shunt protection)
• Class I and Class II surge protective devices applied at the main distribution board (MDB) and at sub-distribution boards (DB or LP)
2) Series (series protection)
• Class III surge protective devices and surge filters applied to protect highly sensitive equipment
A power line surge protective device reduces the voltage level of high-energy electrical systems, protecting against external surges such as lightning strikes and electrical switching operations.
Connection arrangements
There are two types:
1. Shunt protection (parallel)
Class I and Class II surge protective devices applied at the main distribution board (MDB) and at sub-distribution boards (DB or LP).
2. Series protection
Class III surge protective devices and surge filters applied to protect highly sensitive equipment.
Comparing the two arrangements
| Arrangement | Device class | Installation point / use |
|---|---|---|
| Parallel (shunt protection) |
Class I and Class II | Main distribution board (MDB) and sub-distribution boards (DB or LP) |
| Series (series protection) |
Class III and surge filters | Protecting highly sensitive equipment |
Talk to our engineers directly
Specialist engineers with more than 20 years of experience
We have long designed and installed nurse call systems, fire alarm systems
and lightning protection systems for both private companies and government agencies.
Frequently Asked Questions
What does this device do?
It reduces the voltage level of high-energy electrical systems in order to protect against external surges, such as lightning strikes and electrical switching operations.
How many connection arrangements are there?
Two: shunt protection (parallel) and series. The choice depends on the installation point and the nature of the electrical system.
Which SPD class should I choose?
It depends on where in the electrical system it will be installed. Generally, Class I goes at the building service entrance, where it has to handle direct lightning current; Class II goes at sub-distribution boards; and Class III goes close to end equipment. Our engineers can design this for you.
