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2. Transfer switch - Wikipedia

   en.wikipedia.org/wiki/Transfer_switch

   A transfer switch is an electrical switch that switches a load between two sources. Some transfer switches are manual, in that an operator effects the transfer by throwing a switch, while others are automatic and trigger when they sense one of the sources has lost or gained power. An Automatic Transfer Switch (ATS) is often installed where a ...

3. 2N3055 - Wikipedia

   en.wikipedia.org/wiki/2N3055

   The 1967 RCA Transistor Manual, SC-13, did not mention any measure of high frequency performance for the 2N3055; by the 1971 SC-15 manual a transition frequency, f T, of at least 800 kHz was specified (at I C = 1 A) and f hfe (the frequency at which the small-signal current gain drops by 3 dB) was also specified at 1 A to be 10 kHz minimum.

4. Switched-mode power supply - Wikipedia

   en.wikipedia.org/wiki/Switched-mode_power_supply

   Stand-alone switched-mode power supply An adjustable switched-mode power supply for laboratory use. A switched-mode power supply (SMPS), also called switching-mode power supply, switch-mode power supply, switched power supply, or simply switcher, is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently.

5. Circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Circuit_breaker

   Large low-voltage molded-case and power circuit breakers may have electric motor operators so they can open and close under remote control. These may form part of an automatic transfer switch system for standby power. Low-voltage circuit breakers are also made for direct-current (DC) applications, such as for subway lines.

6. 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. There are several different basic ...

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