What’s the Difference Between DC SPD and AC SPD?

DC SPD (DC Surge Protective Device) and AC SPD (AC Surge Protective Device) are both types of surge protectors, but they are designed to protect against different types of transients and are used in different types of electrical systems. They are also typically rated for a specific voltage level and current rating. The standard rating that are available in the market as follow:

  • For DC SPD:

USFULL DC SPD Specification

  • For AC SPD:

USFULL AC SPD Specification

The main difference between DC SPD and AC SPD is the type of voltage they protect against. DC SPD is specifically designed to protect against transients in DC (Direct Current) electrical systems, while AC SPD is designed to protect against transients in AC (Alternating Current) electrical systems.

SPD AC and DC Signals

DC SPD also typically have a faster response time than AC SPD because DC transients tend to be faster and shorter in duration than AC transients.

Another difference is that DC SPD are used in DC systems such as solar panel, electric vehicle charging stations, DC battery backup systems and other DC power systems. AC SPD is used in AC systems such as homes, buildings, industrial facilities and other AC power systems.

Additionally, DC SPD solar are designed to work on direct current, which is a constant current that flows in one direction, while AC SPD are designed to work on alternating current, which is a current that changes direction periodically.

In term of solar application, AC SPD can be installed in the ac side of the system and DC surge protection device shall be installed in DC side of solar system.

In general, it is important to use the appropriate type of solar DC SPD for the specific application and electrical system to ensure adequate protection against transients.

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