LOGK2 is a Heavy Duty Safety Switch, lock-off guard kit for a 60-60 A & 100-100 A. This kit includes, lock-off guard, (2) screws & label. 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. The design life of a F-Series switch is a minimum of three times the NEMA requirement.