These terminal blocks are used anywhere you need to connect wires together. Using a terminal block instead of butt connectors makes for a much neater junction that you can troubleshoot afterward if necessary. These are standard duty blocks which are not as small and fiddly as the 2400 series and have a #8 screw. Rated up to 30 Amps AC or DC they are often found behind electrical panels, in-ceiling voids where they are used for lighting power distribution, or at the base of masts where they make a connection that can be undone if the mast is unstopped. Using terminal jumpers allows you to join adjacent terminals together so you can have a single input wire feeding several branch circuits.
