Product Overview The MT100-B is the heavy-duty member of the NEKEKE battery switch range: a master isolator rated 300A continuous at 32V DC, built for installations where accessory loads have outgrown a light-duty cut-off. It gives the operator a single, unmistakable way to take the battery bank offline — and to bring it back — without touching a terminal or hunting for a fuse. Cut the circuit before winter storage and the slow bleed from bilge pumps, radios, chartplotters