The Littelfuse KLDR,100TXP Fuse 600V Time Delay ,100 Amp is a fuse designed to protect electrical equipment from overloads. This fuse has a time delay of 100 milliseconds, which allows for a quick response time in the event of an overload. The Littelfuse KLDR,100TXP Fuse 600V Time Delay ,100 Amp is a fuse designed to protect electrical equipment from overloads. This fuse has a time delay of 100 milliseconds, which allows for a quick response time in the event of an overload.