It provides continuous protection, starting as soon and lasting as long as the engine is running. Should the Engine overspeed, the Governor's normally open contacts will close, and supply a Battery feed to energize the Ignition Cut-Out Relay "E".

The INT-PRI contacts of this Relay will ground the Engine Ignition Coil and stop the Engine. Once the Ignition Cut-Out Relay "E" is energized it will become self-energized through its SOL contact until the circuit is broken by turning "OFF" the Ignition Switch at the Remote, Local or Manual Station (whichever one was used to start siren).

The Remote Control Operator will know some Safety Control has stopped the Siren because the Signal Light has gone out. Some models of the Overspeed Governor have a reset button that must be manually reset by pushing the reset button on the case, before another start is possible.