Surge protective devices

A surge protective device comprising:

• a first electrical terminal;
• a second electrical terminal;
• and
• an overvoltage protection circuit connected between the first electrical terminal and the second electrical terminal, the overvoltage protection circuit including a spark gap assembly including:
• a horn spark gap assembly;
• and
• an arc chute;
• wherein:
• the arc chute includes a set of deion plates including:
• a plurality of first deion plates each having a first slot having a first profile;
• and
• a plurality of second deion plates each having a second slot having a second profile different than the first profile;
• and
• the first and second deion plates are arranged in spaced apart relation and in alternating series along a chute axis such that the first and second deion plates define a series of arc chute spark gaps extending along the chute axis.

A surge protective device comprising:

• a first electrical terminal;
• a second electrical terminal;
• and
• an overvoltage protection circuit connected between the first electrical terminal and the second electrical terminal, the overvoltage protection circuit including:
• a spark gap assembly between the first electrical terminal and the second electrical terminal, the spark gap assembly including:
• a first spark gap (SG) electrode and a second SG electrode defining a spark gap therebetween;
• and
• a trigger circuit operative to ignite a main electric arc between the first and second SG electrodes across the spark gap;
• wherein the trigger circuit includes:
• a groove defined in the second SG electrode;
• and
• a trigger member disposed in the groove, wherein the trigger member is operative to assist formation of a trigger arc;
• and
• wherein the trigger circuit includes a trigger electrode in electrical contact with the trigger member and connecting the trigger member in electrical parallel with first SG electrode.

A surge protective device comprising:

• a first electrical terminal;
• a second electrical terminal;
• and
• an overvoltage protection circuit connected between the first electrical terminal and the second electrical terminal, the overvoltage protection circuit including:
• a spark gap assembly between the first electrical terminal and the second electrical terminal, the spark gap assembly including:
• a first spark gap (SG) electrode and a second SG electrode defining a spark gap therebetween;
• and
• a trigger circuit operative to ignite a main electric arc between the first and second SG electrodes across the spark gap;
• wherein the trigger circuit includes:
• a groove defined in the second SG electrode;
• and
• a trigger member disposed in the groove, wherein the trigger member is operative to assist formation of a trigger arc;
• and
• wherein:
• the surge protective device is a surge protective device module including a spark gap module housing;
• and
• the spark gap assembly is disposed in the spark gap module housing.