{"title":"4 Channel Arduino Relay Shield","handle":"4-channel-arduino-relay-shield","url":"/products/4-channel-arduino-relay-shield","description":"This 4-channel relay shield from DFRobot plugs directly onto an Arduino Uno or compatible board, providing opto-isolated relay switching for controlling high-power devices such as lamps, water pumps, and motors. Each relay has its own test button and LED status indicator.\n\nThe shield features a built-in XBee socket for wireless remote control via XBee, Bluetooth, or WPM modules. The relay control pins are selectable (default: digital 2, 7, 8, 10), and an external 9V power supply is required to drive the relays and XBee module.\n\nKey Features\n\n\n4 Relay Channels – Opto-isolated for safe microcontroller interfacing\n\nArduino Uno Compatible – Plugs directly onto Rev3 boards\n\nXBee Socket – Built-in support for wireless remote control\n\nTest Buttons – Individual test button for each relay\n\nLED Indicators – Status LEDs show relay state\n\nSelectable Control Pins – Default digital 2, 7, 8, 10\n\n\nSpecifications\n\n\nContact Rating – 3A @ 120V AC / 24V DC\n\nMax Switching Voltage – 240V AC / 60V DC (below 38V recommended)\n\nMax Switching Current – 5A\n\nMax Switching Power – 360VA AC / 90W DC\n\nCoil Voltage – 9V DC\n\nElectrical Life – Min 100,000 operations\n\nMechanical Life – Min 10,000,000 operations\n\nI/O – 6 analogue + 13 digital channels\n\nOperating Temperature – −30°C to +85°C\n\nOperating Humidity – 40–85%\n\nSafety Standards – UL, cUL, TUV, CQC\n\nDimensions – 95 × 65mm\n\n\nIdeal For\n\nHome automation systems\nRobotics and motor control\nWireless relay switching via XBee\nArduino-based switching projects\n\n\nPackage Contents\n\n1× Relay shield for Arduino V2.1\n2× Nylon standoffs with screws\n\n\n\nWarning: Pay special attention to voltages over 38V. An external 9V power supply is required to drive the relays and XBee module. Exercise caution when switching mains voltage.\n\n\nResources\n\nDFRobot Wiki\nSchematic (PDF)\nBoard Layout (PDF)\nSample Code\nHJR4102 Relay Datasheet (PDF)\n","vendor":"DFRobot","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":11583,"title":"Default Title","sku":"DF-DFR0144","price":25.61,"on_sale":false,"in_stock":true,"available_quantity":341,"option1":"Default Title"}]}