Relais (Relay) What it does Electromechanical switching device that enables a low-power control signal to switch a separate higher-power circuit. Provides electrical isolation between control and load circuits for safer, more reliable operation. Key benefits Simplifies control: lets small controllers, switches, or sensors activate motors, lights, heaters, or other loads. Protects equipment: isolates and limits wear on control components, extending service life of switches and controllers. Flexible integration: usable in panel, chassis, or PCB-based systems to add switching capability without redesigning the control electronics. Important attributes Function: on/off switching and circuit isolation through one compact component. Compatibility: designed to work with standard control systems and common wiring practices; can be used wherever a separate switching device is needed between control and load. Size: compact form factor suitable for space-constrained installations; available in typical relay footprints for panel, chassis, or PCB mounting. Material and construction: durable contact and coil construction for consistent switching performance and long operational life. Performance: reliable switching under repeated cycles; suitable for intermittent and continuous control tasks depending on application requirements. Practical use scenarios Industrial control panel: use the relay to drive a motor starter or solenoid from a PLC output while keeping the PLC isolated from high currents. Building automation and HVAC: switch compressors, fans, or pumps from a thermostat or building management control without routing mains power through the controller. Automotive and vehicle systems: control lighting, auxiliary pumps, or accessory circuits from dashboards, switches, or electronic modules while separating sensitive electronics from load transients. Installation notes Mount in accordance with electrical codes and the system’s wiring standards. Select mounting style and pinout that match your panel, socket, or PCB footprint for straightforward replacement or integration. Consider contact ratings and intended duty cycle when choosing a relay for continuous heavy loads. A straightforward switching solution for applications that require isolation, reliable on/off control, and simple integration into existing control systems.