Integrated MOV/GDT Overvoltage Protection Devices – MOVGT Series

Eaton Electronics' MOVGT series radial leaded overvoltage protection devices feature an integrated metal oxide varistor (MOV) and gas discharge tube (GDT) in series as a drop-in replacement to basic radial MOVs. They are available in disc sizes from 7 mm to 20 mm and MCOV values from 70 V to 600 V, suitable for V_AC circuit voltages from 50 V_RMS to 480 V_RMS.

The MOV and GDT combination provides higher surge current withstand and longer life versus traditional MOVs. This is accomplished by coordinating and arranging the MOV and GDT voltages such that the GDT isolates the MOV from small transients that are negligible to the overall system but can unnecessarily age the MOV. However, when subjected to large transients, the GDT activates and the MOV properly clamps the damaging voltage, providing the necessary protection.