also projects outwardly of the housing at the end wall 12 in the provision of a flat pin 72 positioned between the contact portion 73 and the end wall of the adjacent arrester cup is a generally u shaped spring 74 which is similar to the spring 70 the ground terminal 62 has its transversely extending contact portion 76 intermediate and parallel to the contact portions 64 73 furthermore the contact portion 76 is engaged on opposite sides thereof by the respective ends of the rod electrodes 40 of the arresters 38 the ground terminal 62 is seated in a groove 78 fig3 as defined by the sidewalls 4 6 and the cradle 54 the cradle 54 and the arrangement forming the grooves 66 78 for the terminals 58 62 aid in preventing short circuiting between the terminals and the arrester units 38 as with the line terminals the ground terminal 62 includes a substantially flat pin 80 that projects outwardly from the end wall 12 and is substantially coplanar with and coextensive with the line terminal pins 68 72 previously described also forming part of the arrester module 1 is a flat sheet of insulating material 82 best shown in fig4 this insulator 82 is a substantially rectangular sheet of suitable plastic having a notch 84 at one corner thereof and a large substantially central rectangular opening or cut out 86 the insulator 82 is positioned within the housing 2 against the inside surface of the wall 6 the cut out 86 provides for clearance with the components within the housing and allows the insulator 82 to be longitudinally shifted.