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2. Trapped-key interlocking - Wikipedia

   en.wikipedia.org/wiki/Trapped-key_interlocking

   The sliding bolt, when extended, mechanically prevents operation of a switch, valve, gate, or other device. Many variations exist, with different shapes of interlock bolt and multiple lock cylinders on an interlock. A significant feature of the interlock is that the key is held or trapped in one position of the lock.

3. Interlock (engineering) - Wikipedia

   en.wikipedia.org/wiki/Interlock_(engineering)

   An interlock device is designed to allow a generator to provide backup power in such a way that it (a) prevents main and generator power to be connected at the same time, and (b) allows circuit breakers to operate normally without interference in the event of an overload condition. Most interlock devices for electrical systems employ a ...

4. Hubbell Incorporated - Wikipedia

   en.wikipedia.org/wiki/Hubbell_Incorporated

   And while Hubbell was busy on land, the company found new opportunities at sea. In 1952, the ocean liner "SS United States" was launched in Newport News, Virginia. Queen of the seas for many years, the ship was completely fitted with Hubbell wiring devices designed expressly for narrow stateroom partitions and to withstand the effects of salt air.

5. Disconnector - Wikipedia

   en.wikipedia.org/wiki/Disconnector

   Unlike load switches and circuit breakers, disconnectors lack a mechanism for suppression of electric arcs which occur when conductors carrying high currents are mechanically interrupted. Thus, they are off-load devices, with very low breaking capacity, intended to be opened only after the current has been interrupted by some other control ...

6. Interlocking - Wikipedia

   en.wikipedia.org/wiki/Interlocking

   Railway interlocking is of British origin, where numerous patents were granted. In June 1856, John Saxby received the first patent for interlocking switches and signals. [2] [3]: 23–24 In 1868, Saxby (of Saxby & Farmer) [4] was awarded a patent for what is known today in North America as “preliminary latch locking”.

7. Ignition interlock device - Wikipedia

   en.wikipedia.org/wiki/Ignition_interlock_device

   A Draeger ignition interlock device (red arrow) in a Scania bus. An ignition interlock device or breath alcohol ignition interlock device (IID or BAIID) is a breathalyzer for an individual's vehicle. It requires the driver to blow into a mouthpiece on the device before starting or continuing to operate the vehicle.