What is a Relay? A relay is an electrically operated switch used to open or close circuits either electronically or electromechanically. Relays are essential components in automation systems because they allow small electrical signals to control larger loads. Relays work on the principle of electromagnetism . When a small electrical input energizes the relay coil, it creates a magnetic field. This magnetic field pulls an internal armature, which then makes or breaks the circuit connected to the relay contacts. In simple terms, relays convert small electrical impulses into larger switching actions , enabling the control of high-power devices using low-power control signals. Why Relays Are Used? To control high-current loads using low-current signals For electrical isolation between control and power circuits To perform automation tasks safely and efficiently To switch devices ON/OFF automatically Types of Relays Relays are used in automation, protection, and contro...

What is a Timer Relay? A timer relay is an electrical control device used to delay the opening or closing of contacts in a circuit. It works like a normal relay but includes a built-in timer that controls when the relay coil energizes or de-energizes. Timer relays are widely used in automation, industrial control panels, motor control circuits, and safety systems. Why Timer Relays Are Used? Timer relays are used to: Start or stop machines/ Motor after a fixed time  Provide delay for safety interlocks Sequence operations (one motor after another) Avoid sudden load on electrical systems Control lighting, pumps, fans, and alarms Shifting STAR DELTA connection in Motor  How a Timer Relay Works? A timer relay has: Coil – energizes the relay Contacts (NO/NC) – switch the load Timing circuit – delays the switching action Time setting knob/display When a voltage is applied: The timer starts counting (ON delay or OFF delay) After the set time, the contac...