Relay
makerAn electromechanical switch that opens and closes circuits electromechanically or electronically.
expanded
Relays are devices that allow low-power circuits to control high-power circuits, using an electromagnet to mechanically operate a switch. They are commonly used in various applications where it is necessary to control a large load with a smaller, often safer, signal.
examples
Industrial control systems use relays to switch high-current loads such as motors, which often operate at 230 VAC and draw currents up to 10 A. A typical industrial relay, like the Omron G2RL-1-E, can handle coil voltages of 12 VDC, allowing low-power input to control the high-power output safely.
Relays are extensively used in factory automation for controlling robotic arms and conveyor belts, providing both physical and electrical isolation.
Automotive applications often use relays to control electric starter motors. For instance, the Bosch 0 332 002 201 relay can switch currents up to 40 A at 12 VDC, facilitating the high current required by starter motors without needing heavy gauge wiring throughout the ignition switch.
These relays are used in automotive starting systems and to control other high-power components like headlights and air conditioning compressors.