This block can be tted with a combination of up to 10 minifuses or mini bladed breakers and 5 micro relays(SPDT). Typically each relay would be used to switch power supplied from a single minifuse circuit to anaccessory eg. light. However, fuses & relays can be wired independently of each other to suit any design.This block offers a high level of water and dust protection (rated IP66-IEC 60529) when assembled correctly with supplied cavity plugs and cover.