LA603G 5 wire three phase: 603 with separate ground

Weatherproof N-4 Case Dimensions: 2 1/4" Diameter 4 1/2" High Rated voltage 240-480-600 Volt, three or four wire service. Used when three hot wires of a three-phase system are to be protected. INSTALLATION: Fasten arrestor in place. Use a Delta mounting bracket, part # MB, a pipe strap, or a knockout hole. Connect the black wires to the hot line at any convenient point load-side of an existing fuse or circuit breaker. Connect the white wire to an existing ground system and the grounded metal framework of the equipment to be protected or make a ground source per NEC Article 250.