There is provided a surge protector assembly for use with a 66-M type terminal connector block having a plurality of parallel rows of opposed terminals which are laterally spaced apart from each other. The surge protector assembly includes a housing module formed of co-mating front and back halves. A miniature printed circuit board is disposed within the housing module. Surge protector devices, a protector-operational status indicator circuitry, and a ground-connected status indicator circuitry are disposed on the miniature printed circuit board. A plurality of tip/ring terminal contacts are disposed within a lower portion of the housing module for mating with corresponding ones of the opposed terminals of the 66-M type terminal connector block.