Buying Guide

Table Of Contents

What is the “Best” surge protection?

Surge Capacity Rating Scale

We recommend the following criteria in choosing your SPD:

• Surge Current Capacity: This tells you what strength of power surge this unit can handle, the higher the

better. For example, the HEPD80 has a Surge Current Capacity of 80kA. Higher rating generally means you

will get a longer life expectancy.

• Voltage Protection Rating: This is the measurement of what voltage the SPD allows past it, thus in theory

the lower the better. Example: the HEPD80 has 1000V L-L (Line to Line), 600V L-N (Line to Neutral), 700V

L-G (Line to Ground) and 1000V N-G (Neutral to Ground).

• Warranty: For complete peace of mind, take into consideration the duration (years) and warranty (dollars).

• NEMA Rating: Before you look at product ratings, take note of where your load center is located. If it is

inside, any NEMA rating should be ne. If it is outdoors, NEMA 3R or higher is suitable.

Choosing the right SPD