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What the lowest value or smallest surge the CHSPT1ULTRA would pick up?

Any surge device will “absorb” a surge no matter how small. The larger surges will be absorbed as well, up to the surge capacity of the device. With our devices in the load center such as the CHSPT1 or T2 Ultra a larger surge will be absorbed but the let through voltage will be passed on to the branch circuits. The coordination of surge strips and the whole house surge is recommended for that reason. When the voltage reaches the surge strip it is now a dampened waveform that can easily be absorbed by the surge strip. Without the secondary protection at the receptacle there is a possibility under very large surge events that connected equipment could be damaged. These large surge events are few and far between.