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 Lock Off Guard Kit for 30A & 60A, 240V, are for heavy duty safety switch, with a UL listed & CSA certification.