Blue Sea M-Series Single Circuit ON/OFF Switch with Locking Key. Key Features & Benefits: 300 Amps continuous rating Breakout tabs allow wire access in any direction One-piece stainless flange nuts ensure safe and secure connections Tin-plated copper studs for maximum conductivity and corrosion resistance Blue Sea Systems one-piece terminal stud design never loosens over time Isolating cover protects rear contacts CE marked, ISO 8846, UL listed, UL 1107 electric power switch Meets UL 1500 and SAE J1171 protection requirements 1P66 protection rating - water resistant Dimensions & Specifications: 2.1" x 4" x 2.1"(L x W x H)0.65lbSwitch Type: Single Circuit ON/OFFMax Voltage: 48V DCContinuous Rating: 300AIntermittent Rating: 500ACranking Rating 30 sec: 900AStud Length: 7/8" (22 mm) - Accepts multiple cable terminalsStuds accept 3/8" (M10) ring terminalsStud Torque: 120 in-lb (13.56 Nm)