Which of the following is the switching device for a combination lock?

Which of the following is the switching device for a combination lock?

• A. Combination
• B. Key
• C. Bolt
• D. Wheel pack

Answer: (A)

In a combination lock, the input you provide—the combination—acts as the switch that moves the internal parts toward unlocking. Dialing the correct numbers or symbols rotates each wheel to a precise position. When all the wheels line up their gates at the right angles, the internal mechanism allows the bolt to retract. The wheel pack is the group of rotating wheels that perform the actual alignment work, and the bolt is the latch that blocks or allows movement. A key is used for keyed locks, not for combination locks. So the combination serves as the switching device because it controls the sequence that causes the internal wheels to align and release the bolt.

In a combination lock, the input you provide—the combination—acts as the switch that moves the internal parts toward unlocking. Dialing the correct numbers or symbols rotates each wheel to a precise position. When all the wheels line up their gates at the right angles, the internal mechanism allows the bolt to retract. The wheel pack is the group of rotating wheels that perform the actual alignment work, and the bolt is the latch that blocks or allows movement. A key is used for keyed locks, not for combination locks. So the combination serves as the switching device because it controls the sequence that causes the internal wheels to align and release the bolt.