MT046 ON-OFF Battery Isolator Switch The MT046 keeps battery isolation simple: one rotation between ON and OFF, nothing else to remember. It is aimed at single-bank installations where the job is to kill the whole DC circuit cleanly before storage, service or transport, rather than to juggle two battery banks. The contact set is rated 230 amps continuous at 12V DC, which covers the usual mix of navigation electronics, pumps, lighting and fridge loads found on small craft and