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The OS77D Series single set point speed switch is a compact all-electronic speed
sensing module. It can be panel mounted via its trip set point potentiometer. It is
field adjustable and gives a transistor output when tripped. Relay models available.
Models are available with Normally Open or Normally Closed circuit and with or
without re-crank feature which inhibits starter re-engagement until the engine
speed is near zero RPM.
Overspeed shutdown: Activates engine shutdown circuit on engine overspeed.
Operate PTO's or drive circuits: Engage or disengage engine PTO, 4-wheel drives,
or other control circuits according to RPM monitored.
Disconnect engine cranking when engine starts.
Power Supply: Voltage: 7-28 VDC. Maximum Current: 100 mA.
Voltage, Magnetic Pickup Signal Models:
Voltage, Distributor Ignition Models:
Maximum Current, Magnetic Pickup Signal Models: 0.12 mA
Maximum Current, Distributor Ignition Models: 0.12 mA
Adjustment Range, Magnetic Pickup Signal Models: 1000-10,000 Hz
Adjustment Range, Distributor Ignition Models: 40-400 Hz
Reset Differential, Magnetic Pickup Signal Models:
Reset Differential, Distributor Ignition Models:
Output: Transistor Sink to Ground Resistive Load: 2 A, 28 VDC
Adjustment: 270°–turn potentiometer
Temperature Range: -13° to 185°F (-25° to 85°C)
Shipping Weight: 1 lb. (0.45 Kg)
Shipping Dimensions: 8 x 4 x 4-1/2 in. (203 x 102 x 114 mm)
For more information about this product, you can download the related literature here: