The LRB1000 is a single relay, single setpoint shaft speed switches, which is efficient at continuously monitor machine rpm and provide relay protection upon detection of an unwanted change in speed or stoppage of the monitored shaft. The LRB1000 is completely field adjustable while the machinery is at rest; there is no need to run the shaft. The unit feature visual setpoint adjustment for dial-in ease and the precise digital circuitry provides high accuracy, repeatability, and reliability.