General Duty Safety Switch are designed for commercial, institutional, industrial & manufacturing facilities. Electrical interlocks for Series F,100–200A, general duty safety switches, are available in kit form for field installation. Each kit contains instructions for proper field mounting. A pivot arm operates from switch mechanism, breaking the control circuit before the main switch blades break. Switches with electrical interlocks installed are UL Listed. For factory-installed electrical interlocks add EI (for one contact) or EI2 (for two contacts) suffix to catalog number. This fuse rejection kit fuse type J are for heavy duty safety switchwith a rated current of 600A. This rejection kit has a UL listed & CSA certification .