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A photoelectric switch, also called a photoelectric sensor, is a device that detects the presence or absence of an object by measuring changes in light intensity, typically by emitting a light beam and then detecting when that beam is interrupted or reflected by an object; key characteristics include non-contact detection, long sensing distances, high speed response, ability to detect various materials (including transparent ones), and wide application in industrial automation, material handling, and everyday devices like automatic doors and hand-wave faucets.
Key points about sensor switches:

A “sensor switch” is a device that uses a sensor to detect a change in its environment (like movement, light, or temperature) and automatically triggers an action, essentially acting as a switch that turns something on or off based on the detected change; it’s commonly used in lighting systems to turn lights on when someone enters a room and off when they leave, utilizing an occupancy sensor.
Key points about sensor switches:

This article will discuss the general approach to understanding and using these diagrams for safety switch wiring installation.

In electronic switches, “sp” stands for “Single Pole,” “DP” stands for “Double Pole,” “성” stands for “Single Throw,” 그리고 “DT” stands for “Double Throw”; essentially describing how many independent circuits a switch can control (“pole”) and how many positions it can switch between (“throw”) within a single switch mechanism.