You haven't said what the mechanical requirements are, but if they're not severe, maybe the Anderson PowerPole types would work for you.
The single-contact housings are available up to 180 amps, and they can be ganged into multi-contact plugs (they are "hermaphroditic," or genderless) and they can be panel-mounted also:
http://www.andersonpower.com/products/pp/pp.html McMaster sells these in five colors, see e.g. 8026K2.
Anderson also offer multi-contact latching housings up to 10 circuits at 45 amps:
http://www.andersonpower.com/products/powerpak/ppolepak.html I believe these are all rated to 600 V.
