Which statement best describes the basic difference between a magnetic proximity switch and a temperature switch?

• A. A proximity switch detects the presence of metal without contact, while a temperature switch responds to temperature thresholds to open or close contacts.
• B. A proximity switch detects humidity changes; a temperature switch detects light levels.
• C. A proximity switch relies on sound; a temperature switch relies on vibration.
• D. A proximity switch uses color change; a temperature switch uses electrical resistance.

Answer: (A)

The main idea is that these two switches respond to different physical quantities. A magnetic proximity switch senses when a metal object is near without touching it, using magnetic or inductive effects to actuate its contacts. A temperature switch, by contrast, changes state when the temperature reaches a set point, using a temperature-sensitive element (like a bimetal strip or thermistor) to open or close the contacts. This distinction—non-contact metal detection versus temperature-threshold actuation—is precisely what the statement conveys. The other options describe sensing methods (humidity, light, sound, vibration, color, resistance) that aren’t how these switches operate.