What are relays?
A relay is an electrical or electromechanical device whose primary function is to control or interrupt electrical circuits. Relays are designed to allow the management of larger electrical currents or voltages through smaller currents or voltage signals. Depending on the type, relays are used in various situations to achieve electrical isolation between controlled and control circuits or to allow control of multiple circuits with a single signal.
Relays can be electromechanical, using electromagnetic components, or solid-state (electronic), using semiconductors like transistors. Electromechanical relays include an electromagnet, armature, spring, and contacts. When the electromagnet attracts the armature, the contacts close, allowing the flow of electrical current. This control allows relays to have wide applications in electrical systems.
What is the function of relays?
Interrupting and connecting current: Relays allow the interruption or connection of electrical circuits, which is crucial for controlling the flow of electrical energy.
Protection of electrical circuits: They are used to protect against overloads, short circuits, or other irregularities in electrical circuits.
System automation: Relays are important for automating various electromechanical and electrical systems, enabling automatic control based on predefined conditions.
Power distribution: In situations with multiple power sources, relays allow efficient switching between sources, ensuring continuous power supply.
Control of large loads: Relays allow the control of large electrical loads through smaller currents, improving the safety and efficiency of the system.
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