12V 4Ch Relay Module with Optocoupler is a small and easy to use. Significantly it can be used to control one 240V power appliance directly from Arduino, Raspberry Pi, and other microcontrollers or low voltage circuits. Perfect for switching 240V appliances lights, fans, etc, and similarly even high power motors at lower voltages. The board uses a high-quality relay subsequently which can handle a maximum of 30A/250 V AC or 30A/125V AC. Each relay has all three connections Common, Normally Open, Normally markedly Closed brought out to 3 pin screw terminals which make it easy to make and remove connections. The board has a relay status LED unlike to ease debugging. The board can accept control inputs within a wide range of voltages from 4V to 12V. Relays were first used in long-distance telegraph circuits as signal repeaters they refresh the signal coming in from one circuit by transmitting it on another circuit.Furthermore the telephone exchanges and also the early computers extensively employed relays to perform logical operations Also electrical relays got their start in application to telegraphs. American scientist Joseph Henry is often cited to have invented a relay in 1835 in order to improve his version of the electrical telegraph, developed earlier in 1831.However, an official patent was not issued until 1840 to Samuel Morse for his telegraph, which is now called a relay. Features of 12V 4Ch Relay Module: Relay Voltage 12V Channels = 4 Optically Isolated = YES TTL interface to trigger the relay Relay Current handling capacity = 7A @ 250V AC Relay Type Sugar Cube Relay Contacts NO, NC and Common. Standard interface that can be controlled directly by microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM) Package Includes: 1 x 12V 4Ch Relay Module with Optocoupler Video Link for the different types of Relays: Click Here to explore different types of relays boards from Graylogix: SKU: C-42 Categories: GL Products, RELAYS Tag: 12V 4Ch Relay Module with Optocoupler
