Devices and methods related to mov having modified edge

An electrical device comprising:

• a first metal oxide varistor (MOV) including a first metal oxide layer with an external side and an internal side with a first shaped depression, a first external electrode on the external side of the first metal oxide layer, and a first internal electrode covering some or all of the first shaped depression, the first internal electrode having an edge portion that flares away from the first external electrode;
• a second MOV including a second metal oxide layer with an external side and an internal side with a second shaped depression, a second external electrode on the external side of the second metal oxide layer, and a second internal electrode covering some or all of the second shaped depression, the second internal electrode having an edge portion that flares away from the second external electrode;
• and
• a seal implemented between the internal side of the first metal oxide layer and the internal side of the second metal oxide layer to provide a sealed chamber defined by the first and second shaped depressions and enclosing a gas therein, such that the sealed chamber with the gas and the first and second internal electrodes form a gas discharge tube (GDT).