 Class 2 medium protection SPD’s are ideally suited for applications such as; high rise towers with essential computer data, expensive plant machinery, and domestic dwellings with entertainment & computer systems.- All Class 2 medium protection SPD’s have replaceable cartridges and bi-directional connection.
- Protection is ensured in common and differential modes for domestic, industrial and commercial buildings.
A premium configuration has the option of reserve indication. The three stage window arrangement provides an advanced warning that the device needs replacing. A remote indication option also provides an audible or visual alarm to the consumer that the SPD cartridges will soon require replacing.
Cascading
Is the term used to describe the method of combing several levels of SPD’s in the once installation. This takes advantage of the best features of each device to make the installation highly secure. Hager recommends using a high current carrying capacity device, Class1, to divert the bulk of the transient while the Cascaded Class 2 medium protection SPD diverts the possible residual voltage. | 
