PK-2 Test Block <b>Application</b> - For mounting on switchboard panels for use in conjunction with proper test equipment to facilitate the testing of ac instruments, - meters and relays. - - <b>Features</b> - Type PK-2 test blocks are essentially 4-pole and 6-pole jacks, provided with moulded phenolic 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 current circuits, auxiliary contacts are used which - automatically short circuit the current transformer when the cover or plug is removed. - Routine testing can be accomplished simply by removing the cover and substituting the properly connected test plug; normal - connections are restored by replacing the cover Contact rating is 250 volts, 10 amperes continuously. - A hole in cover allows for securing against unauthorized use. - Included with each test block is a kit which includes: - 1) Mounting screws and nuts, Mild Steel - Zinc Plated - 2) Connection nuts and washers, Brass - Nickel Plated - 3) Auxiliary links, contacts, jumpers and fixing screws, Brass - Silver Plated - - ALL ELECTRO PLATING 0.005