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The SW-50 provides reliable engine overspeed protection and is fully field- programmable. It has two relay setpoints: one overspeed plus one auxiliary for crank disconnect, generator field-flashing, or other alarm.


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  • Various signal sources: Senses signal frequency from magnetic pickup or AC signal generator.
  • Field-programmable: Two 25-turn trim potentiometers provide adjustment for setpoints over 3–100% of full-scale frequency range.
  • Test circuit: Permits on-line testing without overspeeding the protected device.
  • Rugged: Sealed, gasketed, reinforced case.