Relays What it is An electromechanical switch that uses a control signal to operate one or more electrical contacts, allowing a lowpower circuit to control a higherpower load while providing electrical isolation between the control and load sides. Key benefits Provides electrical isolation between control circuitry and powered circuits, protecting sensitive electronics Enables remote, automated, or centralized control of power devices from a simple control signal Supports multiple contact configurations to fit a range of circuits and loads Delivers reliable switching with repeatable performance over many cycles Compact form factor suitable for PCB mounting or panel integration Key attributes Function: acts as a controllable switch for lowcurrent control signals driving highercurrent loads Compatibility: available in multiple contact configurations (for example singlepole, doublepole, singlethrow, or dualthrow variants) to match application needs; designed to work with standard control electronics and interfaces Size: compact housing optimized for spaceconstrained installations; exact dimensions depend on model and configuration Material: constructed with insulating housing and durable contact materials; specifications vary by model Performance: rated for defined switching currents and voltages per model; designed for repeatable operation and dependable isolation between circuits How to choose (quick guidance) Match coil control interface to your control system (voltage and drive requirements) Select contact arrangement to suit the number of loads and the desired on/off behavior Confirm the current and voltage ratings align with your load Consider mounting and enclosure needs to fit your space and environment Use scenarios Scenario 1: A microcontroller project uses a relay to switch a lamp from a GPIOdriven transistor driver, enabling safe isolation between the microcontroller and mainspowered lighting Scenario 2: In industrial automation, a PLC output drives a relay to control a pump or heater, allowing a lowpower control signal to manage a current device Scenario 3: In building automation, a central controller or smart relay module uses relays to independently switch HVAC zoning valves or fan units based on sensor input Notes Availability of specific coil voltages, contact configurations, and ratings varies by model; consult the product datasheet for exact specifications and mounting options