M-Series 300A Dual Circuit Battery Switch Off/OnSealed Against Dust & Water Intrusion - To ensure reliable circuit protection for the life of the electrical system installation.Ignition Protected - Safe for installation in closed compartments with potential explosive gases.Serrated Flange Lock Nuts - Improves resistance to cable terminal loosening in high-vibration environments.Flexible Mounting Options - Allow for multiple mounting configurations and a variety of installation types.Harsh Environment Design - With stainless steel hardware, serrated flange nuts, and high-temperature materials.Specifications: Maximum Voltage (Single Circuit): 48 Vdc Maximum Voltage (Selector / Dual Circuit): 32 Vdc Stud Size And Thread: 3/8"-16 Terminal Stud Torque: 120 in-lbs (13.6 N-m) Ring Terminal Size Acceptance: 3/8" (M10) Mounting Holes: #10 Screw Live Switching Rating: 25 Amps Ignition Protection Rating: SAE J1171 / ISO 8846 Bulkhead / Panel - Mounting Hole Size: 2-5/8" / 2-5/16" Cable Size to Meet Rating: 4/0 AWG