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2. Square D - Wikipedia

   en.wikipedia.org/wiki/Square_D

   Square D is an American manufacturer of electrical equipment headquartered in Andover, Massachusetts. Square D is a flagship brand of Schneider Electric , which acquired the company in 1991. The company was listed on the New York Stock Exchange for 55 years prior to its acquisition without reporting financial loss in any calendar quarter ...

3. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   Switch enclosures may also be required to be weatherproof, corrosion resistant, or submersible. An electronic pressure switch incorporates some variety of pressure transducer (strain gauge, capacitive element, or other) and an internal circuit to compare the measured pressure to a set point. Such devices may provide improved repeatability ...

4. Utilization categories - Wikipedia

   en.wikipedia.org/wiki/Utilization_categories

   Control of D.C. electromagnetics: 60947-5-1 60947-5-2 DC-14: Control of D.C. electromagnetic loads having economy resistors in the circuit: 60947-5-1 DC-20: Connecting and disconnecting under no-load conditions: 60947-5-1 DC-21: Switching of resistive loads, including moderate overloads: 60947-5-1 DC-22

5. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually acts as a transducer; it generates a signal as a function of the pressure imposed. Pressure sensors can vary drastically in technology, design, performance, application suitability and ...

6. Sail switch - Wikipedia

   en.wikipedia.org/wiki/Sail_switch

   A sail switch, vane switch or flow switch is a mechanical switch that is actuated on or off in response to the flow or non-flow of a fluid such as air or water. [1] A sail switch typically operates through the use of a paddle or a diaphragm which gets displaced due to the force of fluid or air moving past it.

7. Inertial switch - Wikipedia

   en.wikipedia.org/wiki/Inertial_switch

   An inertial switch is a switch, firmly mounted upon a vehicle or other mobile device, that triggers in the event of shock or vibration. It is a part of electrical circuits that may either enable or disable some function.