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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. Pull-up resistor - Wikipedia

   en.wikipedia.org/wiki/Pull-up_resistor

   For a switch that is used to connect a circuit to ground, a pull-up resistor (connected between the circuit and V CC) ensures a well-defined voltage (i.e. V CC, or logical high) when the switch is open. For a switch that is used to connect a circuit to V CC (e.g. if the switch or button is used to transmit a "high" signal), a pull-down resistor ...

4. Mercury switch - Wikipedia

   en.wikipedia.org/wiki/Mercury_switch

   A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit.

5. Thermal cutoff - Wikipedia

   en.wikipedia.org/wiki/Thermal_cutoff

   A thermal switch (sometimes thermal reset or thermal cutout (TCO)) is a device which normally opens at a high temperature (often with a faint "plink" sound) and re-closes when the temperature drops. The thermal switch may be a bimetallic strip, often encased in a tubular glass bulb to protect it from dust or short circuit. Another common design ...

6. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   A simple on-off switch. The two terminals are normally disconnected (open) and are closed when the switch is activated. An example is a pushbutton switch. SPST-NC Form B [4] Single pole, single throw, normally closed A simple on-off switch. The two terminals are normally connected together (closed) and are open when the switch is activated.

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9. Contact protection - Wikipedia

   en.wikipedia.org/wiki/Contact_protection

   This can also occur during the open-to-close (MAKE) transition due to contact bounce. The electric arc occurs between the contact points (electrodes) both during the transition from closed to open (BREAK) and from open to closed (make) when the contact gap is small and the voltage is high enough. Heating due to arcing and high current density ...