How do I protect computer and home theatre circuits?
The devices connected to these circuits are very sensitive. By connecting a fine device SPN208S (in series with circuit MCB or RCBO) in conjunction with a medium SPD (SPN115 / 140 / 165), enhanced protection is provided. The medium SPD will divert a surge up to 65kA leaving a residual voltage of 1.0 – 1.5kV. These voltage levels are still too high for sensitive equipment so the next step is to limit this voltage to 800V. This is achieved with the use of the Class II Fine devices (SPN208S and SPN408S) which have a lower current carrying capacity, but will limit the voltage to 800V. Using both SPD devices is called cascading. Cascading increases the current diverting capacity of our SPD system whilst maintaining a low residual voltage to ensure the best protection for valuable equipment.
