A test switch is provided having front and rear sides. The test switch includes a base to which a plurality of switch units are mounted. A row of upper terminals are removably mounted to the base, above the switch units, and a row of lower terminals are removably mounted to the base below the switch units. The upper and lower terminals are adapted for connection to wiring from the front side of the test switch. Upper and lower covers are releasably attached to the base and extend across the rows of upper and lower terminals, respectively.