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Examples of common inherently safe systems:

  • The overflow tube in baths and Kitchen Sink s. If the valve sticks open, rather than causing an overflow and damage, the tank spills into an overflow.

  • In an Elevator the cable supporting the car keeps spring-loaded Brake s open. If the cable breaks, the brakes grab rails, and the car does not fall.

  • The pilot light sensor in most Gas Furnace s. When the Pilot Light is off, the sensor cools down and a mechanical arrangement such as a Bimetal lic switch disengages the gas valve, so that the house cannot fill with unburned gas.

  • Railroad Semaphore s are designed so that the horizontal position signifies the "Stop" (danger) position. If the controlling mechanism fails and the arm is free to fall under Gravity , it will fall to the "Stop" position, regardless of the condition of the line ahead.


Not all systems allow for inherent safety. For instance, an inherently safe airplane would be desirable but is not possible because of airplanes' high speeds and altitudes.

Inherent fail-safes are common in medical equipment, traffic and railway signals, Nuclear Reactors , communications equipment, and safety equipment.


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