The CB29BB (shown below) is the same as the CB29, and the CB29HB the same as the CB29H, but with no terminal blocks installed. Use with your own terminal blocks, as an adapter cable interface, or for other purposes. Set of two boards.
CB29BB is rated for operation up to 1500 Vdc, 1000Vac.
CB29HB is rated for operation up to 2100 Vdc, 1200Vac.
Can be certified for operation at the maximum rated voltage for a service fee (Item 626).