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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. There are several different basic ...
The krytron is a cold-cathode gas-filled tube intended for use as a very high-speed switch, somewhat similar to the thyratron. It consists of a sealed glass tube with four electrodes. A small triggering pulse on the grid electrode switches the tube on, allowing a large current to flow between the cathode and anode electrodes.
A current dependent resistor formed of a fine wire in an envelope, useful for regulating current. humidistat A switch that operates automatically on detecting a change in moisture content of the air. HVAC High Voltage Alternating Current; depending on context, this could be hundreds or hundreds of thousands of volts. HVDC converter station
High <1 kV Very high >1 kV Current rating High <500 A Low <200 A High >500 A Input drive Current ratio h FE ~ 20–200 Voltage V GS ~ 3–10 V Voltage V GE ~ 4–8 V Input impedance Low High High Output impedance Low Medium Low Switching speed Slow (μs) Fast (ns) Medium Cost Low Medium High
A high-voltage disconnect switch used in an electrical substation. Such switches are used mostly to isolate circuits, and usually cannot break load current. High-voltage switches are available for the highest transmission voltages, up to 1 million volts. This switch is gang-operated so that all three phases are interrupted at the same time.
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Series II current ratings are 20, 30, 60, 100, 200, 300, 350, 500 and 600 amps. The voltage ratings go up to 1000 V AC. These have been replacing the American-style for some time and are much more likely to be found in food processing, data centers, healthcare, entertainment, and other industries.
These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.
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