metal having good electrical conductivity and corrosion resistance such as brass of these two properties corrosion resistance is the most important to assemble pdb 10 link terminals 56 are placed over the appropriate terminal blades 54 and power connection bolt 18 is inserted through bolt hole 62 from below as bolt shank 72 passes through bolt hole 62 bolt head 74 slides freely between side plates 58 until coming into contact with latch tabs 68 further urging of bolt 18 into bracket 50 causes bolt head 74 to deflect latch tabs 68 outwardly towards side plates 58 as the bolt head 74 passes therebetween latch tabs 68 are sufficiently resilient to snap back to their undeflected inwardly angled positions after bolt head 74 has passed beyond them side plates 58 may also deflect or bow outwardly somewhat to permit passage of bolt head 74 between tabs 68 stiffening ribs 64 adding sufficient stiffness to the side plates to prevent them from remaining permanently in an outwardly bowed condition when tabs 68 have returned to their undeflected positions the upper edges thereof impinge upon the bolt head 74 to retain the bolt 18 in captive engagement with bracket 50 as depicted in fig4 6 busbar 16 is then inserted into the lower side of upper housing 12 such that.