Type PK-2 test blocks are essentially 4-pole and 6-pole jacks,
provided with molded Textolite covers that have internal
plug contacts, which make a through connection when the
cover is in place. The contacts in the blocks are of the line-
pressure type and provide positive contact with minimum
contact resistance. For all current circuits, auxiliary contacts
are used which automatically short circuit the current transformer when the cover, or plug is removed.
For mounting on switchboard panels for use in conjunction
with proper test equipment to facilitate the testing of ac
instruments, meters and relays.