Product Overview Choosing a master isolator comes down to two questions: how much current has to pass, and how many system voltages you need to cover. The MT015 answers both without extra complexity. It switches a single circuit with two positions, carries 175 amps continuously, and works anywhere between 12 and 36 volts DC. That combination suits a workshop that stocks one part number for several boat and vehicle models, and it suits the installer who does not want to