ME-IO Compact Housing System Phoenix Contact ME-IO Compact Housing System offers up to 36 connection points on a slim, 18mm design customized to create a solution for any application. The ME-IO offers the functional T-bus system and is compatible with ME and ME-MAX. The lock-and-release system makes locking and releasing the plug from the housing system easy. Integrated push-in connection technology allows conductors to be connected directly, without any extra tools, saving designers time when connecting devices. To ensure quick, secure communication the Phoenix Contact ME-IO housing system comes equipped with connection technology-adjusted to fit both the electronic requirements and the housing system itself.