In protecting electrical equipment from power surges and other electrical disturbances, Surge protective devices play a crucial role . But with so many options available, how do you choose the right surge protective device for your needs?
1. Determine your Needs
The first step in selecting an SPD is to determine your needs. What equipment do you need to protect? What is your budget? Determine if you need a residential or commercial grade SPD. You should also understand the type of electrical system you have and the maximum voltage you can expect.
On a macro level, the electrical system has two types, AC system and DC System. SPDs for AC system is widely used. And SPDs for DC System is normally used in Solar system.
The widely used maximum voltage of SPDs is 40kA, but there are also other maximum voltage, such as 20kA, 60kA, 100kA, etc.
2. Norminal Voltage
To choose the suitable SPD, the norminal voltage should be considered according to the electrical system.
3. Response Time
The response time of an SPD is critical. Look for SPDs with a response time of less than one nanosecond. This ensures the SPD can react quickly to surges and prevent damage.
4. Type of SPD
The types of SPD are T1, T2, T1+T2, etc. Decide which type of SPD is right for your needs.
5. Poles of SPD
According to the number of the lines, choose the right poles of SPD.
6. Surge Capacity
The surge capacity of an SPD is the maximum amount of voltage it can handle. Look for SPDs with a surge capacity that exceeds the highest expected voltage in your area.
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