Woodward Speed Switches

    Powerful performers in speed monitoring and engine protection operations


    Woodward speed switches defend your engine or equipment against the damaging and dangerous conditions of overspeed and underspeed. Our speed switches offer many choices—from single-channel, manually adjustable models to multiple-channel, software configurable models.  


    Electronic Speed Switches

    A speed switch is an electronic device that senses rotational motion and speed. The speed switch obtains a signal from a sensor device (magnetic pick-up, Mini-Gen® signal generator, alternator, or ignition coil) in the form of a frequency. This frequency is monitored electronically within the switch. When the speed or frequency reaches the desired setting or set point, the output relay tied into the control circuit is energized or switched.
    Two-channel electronic speed switch combines the convenience of manual adjustments with the flexibility of a computer-based calibration tool. Learn more ... 
    Three-channel protection module performs a variety of functions simultaneously. Diagnostic fault lights pinpoint engine failures, reducing maintenance and repair costs and minimizing downtime. Learn more ... 
    Single-channel and dual-channel speed switches monitor and control critical speed functions such as crank disconnect or overspeed protection, transmission shift inhibiting, and PTO protection. Learn more ... 

    Mechanical Speed Switches

    A mechanical speed switch activates at an RPM specified by the user. The device is designed with a spring and weight combination to detect either underspeed or overspeed. Output is a hard contact closure specified by the user—typically SPNO (single pole normally opened), SPDT (single pole double throw) and SPNC (single pole normally closed) contacts.

    Woodward’s mechanical speed switches are available as replacement only items.

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