System The NT-IN line of Fuse-Switches is the result of year-long experience and provides sophisticated technical solutions for all applications: The coordinated switching devices are available as an extensive and flexible system. Ease of installation has been a key requirement for the development of the system and its accessories. The system's appealing style enhances the appearance of a well-planned distribution system using EFEN products. The EFEN-IN line is nationally and internationally approved. Options In addition to the standard sight windows for quick voltage checking, blown-fuse monitoring devices and switch-position indicators are available. A broad range of user-oriented solutions make EFEN-IN switching devices one of the most comprehensive product lines on the market. Please contact us for further information.