- Magnetic pick-up input 

- 3 Speed set point

- Output relay contact

       Speed Sensing Relay provides 3 user adjustable trip levels with LED relay state indication and a speed indicator output signal. Trip functions provided are

CRANK disengages the crank starter

UNDER SPEED energises protection or underspeed alarm

OVER SPEED alarms or trips on overspeed

  A magnetic pick-up, situated close to the engine flywheel, produces a high frequency pulse train directly proportional to the number of teeth passing it. The frequency of these pulse is converted to an analogue signal which is used to provide both engine speed indication and the signal to the trip circuitry.