A terminal block is used to connect the leads from an ejection charge to the connections from an altimeter or timer. McMaster-Carr sells "touch-safe" terminal blocks which work well in rockets. Their two-circuit "touch-safe" ones (part number 7618K611) are about $0.66 each.
All Electronics Corp.'s "24 AMP FEED-THROUGH TERMINAL STRIP" can be cut into sections to make up to 24 terminal strips for your electronics bay. Order online from All Electronics for less than $2. Shipping charges are reasonable.