Solid State Relay

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Solid-state relays (SSRs) are electronic devices that turn on or off instantly when a small voltage is applied across their control terminals. These relays consist of three main components: a sensor that responds to an input signal, a solid-state switch that controls power flow, and a coupling mechanism that enables the control signal to activate this switch without mechanical parts. Designed to handle either AC or DC loads, SSRs function similarly to electromechanical relays but have no moving parts. Packaged SSRs use semiconductor devices like thyristors and transistors to switch currents up to 100 amperes. Compared to electromechanical relays, solid-state relays have fast switching speeds and no physical contacts that can wear out. However, their application requires consideration of their lower ability to withstand momentary overloads compared to electromechanical contacts.