Contacts

The HH supplied with high-pressure silver to copper contacts at 600 amp and silver to silver at 1200 amp and above producing the highest conductivity initially and over time. The bronze contact casting has a brazed silver overlay that mates with silver electroplated blades. The methods and materials used in the application of silver provide surfaces of differing hardness with anti-galling properties, resulting in minimal wear over years of operation.

Blade

The blade is constructed of parallel copper bars that are trussed giving the blade maximum rigidity. Standard blade stops are set at 90 degrees. Switch Bases Hot dipped galvanized, single channel structural steel is used for the construction of the switch base.

Insulators

The HH is designed to accommodate commercially available insulators with three or five inch bolt circles. Insulators are assembled inverted so switch can be installed under hung or vertical without disassembly.

Terminals

NEMA drilled terminal pads – 9/16" holes on a 1-3/4" centers, 2-hole pads on 600 ampere switches. 4-hole pads 1200 amperes through 3000 amperes. Tinned terminal pads are standard.