Magnetic reed switches are what type of devices?

• A. Electrical
• B. Mechanical
• C. Optical
• D. Thermal

Answer: (B)

Magnetic reed switches are defined by the way they operate: two ferromagnetic reeds sealed in glass slide together or separate in response to a magnetic field. The actuation relies on actual physical movement of those reeds, so the switch’s defining feature is mechanical motion used to change an electrical connection. That physical movement, driven by magnetism, is what makes it a mechanical-type device even though it controls electrical current. It isn’t based on light (optical) or heat (thermal), and its primary action isn’t described purely as an electronic process without moving parts.