Relay

Relays are electronic switches used when an independent low-voltage signal is needed to control a high-power circuit. They commonly use

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Solid state relay

Construction, Advantages and disadvantages over electromechanical relays, No moving parts, Input circuit of SSR, Output circuit of SSR, Applications, AC

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Triac

Introduction, Advantages and disadvantages of triac, Symbol and construction of Triac, Operation of Triac, Current-Voltage relationship of Triac, Triac control

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Diac

Bi-directional switch, No gate electrode, Symmetric current-voltage relationship, Triggering of Triacs, Holding current

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Thyristor (SCR)

Silicon-controlled rectifier (SCR), unidirectional, Construction, I-V characteristics, PNPN, Gate, Anode, Cathode, Diode vs SCR, Data-sheet specifications

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