Surge protection device including multiple varistor wafers with coordinated electrical characteristics to reduce current imbalance during response to overvoltage events

A surge protection device (SPD) assembly, comprising:

• a base;
• and
• an SPD mounted on the base, the SPD comprising:
• a housing;
• a plurality of metal oxide varistor (MOV) wafers, respective ones of the plurality of MOV wafers having electrical characteristics that reduce an imbalance in current between the respective ones of the plurality of MOV wafers in response to an overvoltage event;
• and
• one or more electrodes, the plurality of MOV wafers and the one or more electrodes being alternately arranged in the housing.