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2. Limit switch - Wikipedia

   en.wikipedia.org/wiki/Limit_switch

   A limit switch with a roller-lever operator; this is installed on a gate on a canal lock, and indicates the position of a gate to a control system A limit switch mounted on a moving part of a bridge In electrical engineering , a limit switch is a switch operated by the motion of a machine part or the presence of an object.

3. Reed switch - Wikipedia

   en.wikipedia.org/wiki/Reed_switch

   A reed switch has very low resistance when closed, typically as low as 0.05 ohms, whereas the Hall effect sensors can be in the hundreds of ohms. A reed switch requires only two wires whereas most solid-state devices require three wires. A reed switch can be said to require zero power to operate it.

4. Electronic component - Wikipedia

   en.wikipedia.org/wiki/Electronic_component

   Limit switch – Mechanically activated switch to sense limit of motion; Mercury switch – Switch sensing tilt; Centrifugal switch – Switch sensing centrifugal force due to rate of rotation; Relay or contactor – Electro-mechanically operated switch (see also solid state relay above) Reed switch – Magnetically activated switch

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6. Reed relay - Wikipedia

   en.wikipedia.org/wiki/Reed_relay

   Reed switches have been manufactured since the 1930s. Compared with armature-based relays, reed relays can switch much faster, as the moving parts are small and lightweight, although switch bounce is still present. [1] Also, they require less operating power and have lower contact capacitance.

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