Conbined tubular metal oxide varistor and gas discharge tube

A protection module, comprising:

• a tubular ceramic part having a first end directly coupled to a first electrode and a second end directly coupled to a second electrode;
• a tubular metal oxide varistor (MOV) having a first end directly coupled to the second electrode and a second end directly coupled to a third electrode, wherein the tubular MOV includes a central cavity aligned with a central cavity of the tubular ceramic part, and wherein the central cavity of the tubular MOV and the central cavity of the tubular ceramic part contains an inert gas;
• and
• an enclosure surrounding the tubular ceramic part and the tubular MOV within a same internal cavity.

A protection device comprising:

• a tubular ceramic part having a first end directly coupled to a first electrode and a second end directly coupled to a second electrode;
• a tubular metal oxide varistor (MOV) having a first end directly coupled to the second electrode and a second end directly coupled to a third electrode, wherein a central cavity of the tubular ceramic part is fluidly connected with a central cavity of the tubular MOV, and wherein an inert gas is disposed within the central cavity of the tubular MOV and the central cavity of the tubular ceramic part;
• and
• an enclosure surrounding the tubular ceramic part and the tubular MOV.