What is key difference between a glass surge absorbers & a glass discharge tube(GDT) ?

 

Glass surge absorbers are used to protect equipment from catastropic electrical transient induced by lighting strike where glass discharge tube used to protect the equipment against against over voltages caused by lighting.

 

Glass surge absorbers are used to protect equipment from catastropic electrical transient induced by lighting strike where glass discharge tube used to protect the equipment against against over voltages caused by lighting.

Ok, then what is the difference between:
catastropic electrical transient induced by lighting strike
and
over voltages caused by lighting

 

Glass surge absorbers are used to protect equipment from catastropic electrical transient induced by lighting strike where glass discharge tube used to protect the equipment against against over voltages caused by lighting.

Yes, please tell the difference and explain your point in more detail

 

Life of the device, in terms of events before failure.

Transients = often, moderate energy

Nearby strike = rare, huge energy.

Gas discharge tubes are rated for 10-100 or so 'events' before they die, so it had better be a rare occurrence.