Relay Modules

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Relay Modules — 1, 2, 4, 8-Channel with Optocoupler Isolation Relay modules allow microcontrollers like Arduino and Raspberry Pi to switch high-voltage AC and DC loads — lights, motors, appliances, and industrial equipment — using a low-voltage digital signal. All relay modules in this collection include optocoupler isolation to protect the microcontroller from voltage spikes and noise on the load side. Channel Options 1-Channel: Single relay for simple ON/OFF switching of one load 2-Channel: Two independent relays for dual-load control 4-Channel: Four relays — the most popular size for home automation and multi-zone control 8-Channel: Eight relays for large-scale switching applications Multi-voltage (5V/12V/24V): Coil voltage selectable to match your power supply Key Features Optocoupler isolation: Electrically isolates the control circuit from the load circuit High/Low level trigger: Selectable trigger polarity — compatible with active-HIGH and active-LOW MCU outputs LED indicators: Visual status indicator for each relay channel SPDT contacts: NO (Normally Open) and NC (Normally Closed) terminals on each relay Solid State Relay (SSR): No moving parts, silent switching, 250V 2A AC load Typical Applications Smart home lighting and appliance control Industrial automation and PLC replacement Irrigation and pump control HVAC and temperature-controlled switching Arduino/Raspberry Pi home automation projects All relay modules are in stock and compatible with Arduino, ESP32, ESP8266, and Raspberry Pi.