The A165KJ3 switch from Omron is a rectangular selector keylock switch designed for industrial and commercial applications. It's commonly used in machinery, equipment, and control panels where reliable key operation is crucial. If you're working on projects that require secure access and precise control, this switch might be a good fit.

One thing worth noting is its robust design, which makes it suitable for environments with frequent use and potential dust or moisture exposure. Engineers tend to reach for this when they need a switch that can withstand harsh conditions while still providing a tactile feedback mechanism. Its keylock feature ensures that once a specific key is inserted, the switch can only operate in one position, adding an extra layer of security and preventing accidental changes in settings. This is particularly useful in scenarios where maintaining a specific operational state is critical.