AST Tswitch Battery Isolation Solution. 12V 500Amp continuously rated isolation switch with safety lock out. Auto Switch Technologies is a specialist in design and manufacture of heavy duty switches and automotive electrical solutions. The Tswitch is now the bench mark in battery isolation solutions and achieves new standards worldwide. Designed in Australia and manufactured in Germany of the highest quality materials, the Tswitch meets and exceeds the standards required worldwide in the transportation of dangerous goods and isolation of vehicles to industries such as mining. The superior standard of design and quality of manufacture means that there is no negative impact on starting and charging systems. The functions of the Tswitch can also be tailor made to suit specific applications. Tswitch - Nothing else comes close.