Features: Optional window allows viewing of both visible blade and indicating type fuses; Hp rated enclosed switch for motor load applications; Ground bar supplied as standard and connected to 4th wire in receptacle; The switch enclosure and receptacle are interlocked with the body and operating mechanism, the enclosure cannot be opened when the plug is engaged and switch is in on position; Switch cannot be turned on with enclosure door open; Interlock mechanism on the receptacle prevents plug from being disengaged under load; Factory adjusted interlock rod assures optimal interface with receptacle; Tool-free cover latches for quick and easy access; Corrosion and impact-resistant; Door with seamless gasket prevents moisture ingress