The Square D? by Schneider Electric brand Heavy Duty Safety Switch is designed to be tough, reliable and provide exceptional performance in the most grueling conditions. F Series safety switches provide significantly higher levels of mechanical endurance than NEMA KS-1 or UL98 standards require. All heavy duty safety switches feature a quick-make, quick-break operating mechanism, a dual cover interlock and a color-coded indicator handle. This Single Throw Safety Switch has a rated current of 100A and is UL listed with a NEMA 3R rating of protection. This Class R Fuse Rejection Kit has a rated current of 200A. This fuse kit is for type F fuses. This Handle Mechanism with a NEMA 3R/12 protection rating, are for heavy duty safety switch 100A with aUL listed & CSA certification.