GBSX-7 is a closed-back terminal block from Curtis Industries' Series GFT/GB line, designed for sub-chassis and thru-panel applications with a 7-terminal configuration. The block features 7/16" (11.11mm) center-to-center spacing, a current rating of 20 amps (UL and CSA), and voltage ratings up to 300 volts CSA and 150–600 volts UL depending on application class. The housing is constructed from phenolic material with a continuous use temperature rating of 150°C (302°F), and the block accommodates wire sizes from No. 22AWG to No. 12AWG with tightening torque specifications of 9 in.-lb. for both wire binding screws and wire clamps. The closed-back design allows mounting directly on metal surfaces without additional insulation, and the block is UL recognized and CSA certified for reliable performance in industrial and commercial electrical applications.