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. The "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 Heavy Duty Safety Switch Insulated Groundable Neutral Assembly has a rated current of 30A to 100A. This switch can accept a AWG wire gauge of AWG 14/AWG 1/0 for copper or aluminium. locking H- and J-frame circuit This heavy duty safety switch, solid neutral assembly, has a rated current of 30A-100A, and will accept a AWG gauge of AWG 14/AWG 1 x 0 for copper or aluminium.