Interrupting A Circuit With A Switching Device

Switching devices are a way of disconnecting power from a circuit for safety. It may be as simple as a low oil cutoff switch that kills the spark to a motor, making it die out if the oil gets too low. Then again, it may be a circuit breaker in your home that protects circuits from an overabundance of amperage. These are just a couple of examples of switchng devices. Do you know what the rest of them are?