The NLR21E is basically a timing device that automatically provides reclosing signals to a circuit breaker that has been tripped by its protective relay. Basically, the NLR21E consists of a static timer and a stepping switch that serves as a memory device. There are three adjustable lobes on the outside cam (SC} on the stepping switch, which provide adjustable breaker-closing signals, and one fixed lobe (in zero position) for instantaneous reclosure. Three auxiliary telephone-type relays ensure complete breaker closing and rapid reset.