Linergy NEMA sectional terminal blocks are for terminating wire and are designed to NEMA standards. This circuit isolation terminal block has pressure wire connectors for use with solid or stranded copper wires from #18 AWG through #10 AWG. Each pressure wire connector is approved for use with various wire combinations. These thermal units will trip in 20 seconds or less on overload conditions. The nylon block is molded in the natural color of nylon (off white). This block is UL component recognized and CSA certified for up to 30 Amp. Both UL and CSA have the block rated at up to 600 VAC or VDC.