Hubbell® has the broadest offering of TVSS receptacles in the industry with technology that is unsurpassed. Inside Hubbell® TVSS receptacles are two 22 mm square disc MOVs providing 240 J of surge protection for each mode. The nylon component shield protects the printed circuit board from moisture and contaminants. An all glass PC board provides superior moisture immunity for longer life in humid environments. Conformal coating is provided on the printed circuit board for additional moisture immunity.