MT029 Heavy Duty ON-OFF Isolator — 48V, 500A Working, 2500A Cranking Large DC banks punish weak hardware. The MT029 is built for the top end of the marine and vehicle market: 48-volt systems, 300A to 500A working current, and a 2500A cranking window measured over five seconds. It is the switch you fit when the load is an electric drive, a large lithium bank, a thruster set, or a heavy diesel that draws hard for a moment before it fires. Two positions, ON and OFF, with a hard