Linergy power distribution blocks are for terminating wires and are designed to NEMA standards. This three pole block has one lug opening on the line (main) side and four lug openings on the load (branch) side. The line side lug is rated to accept one #14 to 2/0 copper or aluminum wires. Each load side lug is rated to accept one #14 to #4 copper or aluminum wire. The lugs are made of aluminum. The lugs are rated for 175 amperes with copper wire and 135 amperes with aluminum wire. The lugs are rated to 600 volts. The housing is made of high impact thermoplastic. These Linergy power distribution blocks are UL component recognized and CSA certified.