Energy Absorption Capability

The maximum amount of energy an arrester can absorb due to

1. Thermal energy absorption capability: maximum amount of energy that can be absorbed by an arrester in the form of several subsequent discharges within a short time interval without leading to thermal instability. The thermal energy absorption capability is greater than the impulse energy absorption capability. A multiple impulse switching surge type test measures the thermal absorption capability. This capability is limited by the maximum operating temperature of the ZnO material.
2. Single impulse energy absorption capability: the maximum amount of energy that can be absorbed during a single discharge operation. This capability is limited by the thermo-mechanical strength of the ceramic.