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8-Channel Relay Module

8-Channels Relay module, It Can Be controlled directly By a wide range of microcontrollers Such as Arduino, AVR, PIC,
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8-Channel Relay Module

Introduction 8-Channel Relay Module:

Arduino Relay Shield employs a high-quality relay with eight channels of input and eight channels of output. It Can Be connected to 250V/10A AC element or 24V/10A DC Element to The maximum, therefore, It can be Used to Control lights, motors, ETC. The modularized design makes it easy to connect to the Arduino expansion board. The output state of the relay is shown by a luminous diode for the convenience of the actual application.

This is a 5V 8-Channels Relay module, It Can Be controlled directly By a wide range of microcontrollers Such as Arduino, AVR, PIC, ARM, and MSP430. 8 Relays are included in this module, with “NC” ports meaning “Normally connected to COM” and “NO” ports means “Normally open to COM”. This module is also equipped with 8 LEDS to show the status of relays. The new 5V Relay Module can be used as a microcontroller development board module and can be used as a home appliance control5 V-12V to TTL control signals control Signal DC or AC, 220V AC load can Be controlled. There is a normal Open and one normally closed contact power indicator light control indicator, pull off, disconnect does not shineTransistor drive to increase the relay coil control pins high impedance. The control pin has a pull-down circuit to prevent the malfunctioning Relay.


  1. Rated load: 10A 250VAC
  2. Rated Through-current: 10A(NO) 5A(NC)
  3. Max Switching Voltage: 250VAC 30VDC
  4. Contact actuation time: 10ms
8-Channel Relay Module

Circuit Operation:

The 8-channel Relay Module contains 8 5V relays and The associated Switching and isolating components, which makes interfacing with a microcontroller or Sensor easy with minimum components and connections. There are 8 terminal blocks with 6 terminals each, and each block is Shared by two Relays. The Terminals are screw-type, Which makes connections to mains wiring easy and changeable.

The 8 Relays on the Module are rated For 5V, which means the Relay is activated when there is approximately 5V across The Coil. The contacts on each relay are specified for 250VAC 30VDC and 10A in each case, as marked on the body of the relays. The switching transistors act as a buffer between the relay coils that require high currents, and the inputs which don’t draw much current. They amplify The Input signal so that they Can drive the coils to activate the relays.

8 channel relay module circuit operation

The Freewheeling Diodes prevent Voltage spikes across the Transistors when The relay is turned off Since the Coils are an inductive load. The indicator LEDs Glow when the coil of the respective Relay is energized, indicating that the relay is active. The Optocouplers Form an additional layer Of isolation between the load being switched and the inputs. The isolation is optional and can be selected using The VCC selector jumper. The input jumper contains the Main V­CC, GND, and Input pins For easy connection using the female Jumper Wires.

The Driver circuit For this relay module is slightly different compared to traditional relay driving circuits since there is an optional additional layer of isolation. When the jumper is shorted, the relay and the Input share the same VCC, and when it is open, a separate power supply must be provided to the JD-VCC Jumper To power the relay coil and optocoupler output. The Inputs For This Module are active low, meaning that the Relay is activated when The signal on the input Header is low. This is Because the indicator LED and the input of the optocoupler are connected in series to the VCC pin on one end, so the other end must be connected to the ground to enable the current flow. The Optocoupler Used here is the PCF817, which is a common optocoupler That can also be found in through-Hole packaging.

The 8-channel can Be used To switch Multiple loads at the same time since There are eight relays on the same Module. This is useful in creating a Central Hub From where multiple remote loads Can Be powered, which is useful for tasks like Home automation where the module can Be placed in the Main switchboard and can Be connected To loads in other parts of the house and controlled from a central location using a microcontroller. In this diagram, 8 separate loads (represented by lightbulbs) Have Been connected to the NO terminals of the relay. The live wire has Been connected to the common Terminal of each Relay. When the relays are activated, the load is connected to the live Wire and is powered. This setup can be reversed by connecting the load to the NC Terminal, which will keep it powered on till the relay is activated.

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How the 8-Channel Relay Module Work:

This 8-Channel 5V Relay Has both optical and magnetic isolation, Providing a lot of protection to the inputs from electrical Faults on the outputs. Works Well with Both 3.3V and 5V logic (Raspberry Pi, Arduino, Teensy), Requiring little current drive. Breadboard friendly, using Female/male Dupont makes It extremely convenient For prototyping.LED indicates its working status. Red refers To errors of 3 terminals Per SPDT relay. Each relay needs a 15-20mA driver Current.

Equipped with high-current relay: DC30V 10A AC250V 10A.Each relay has normally open and normally closed contact. The 8 channels are optically isolated, safe, reliable, and anti-interference. Can Be selected by Jumper relay and TTL or ground. With a power indicator, each channel has a status indicator. With a relay coil to absorb the diode protection power supply and relay instructions, lit, the disconnect is off input signal, signal, common Terminal and start conducting for appliance control

DC Or AC signal, control, you Can control the 220V AC load. Triode drive, increasing relay coilHigh impedance controller pinPull-down circuit for the avoidance of malfunction the module is compliant with international safety standards, control, and load areas isolation trenches.Size: 140mm x 55mm It is a 5V 8 Channel Relay Module. The Relay Normally opens The interface maximum load: is AC 250V/10A, DC 30V/10A. It has a trigger current of 5mA and a module working voltage of DC 5V. Each channel Of the Module can Be triggered by a jumper to set a high level or a low level.

Frequently Asked Questions

What is the principle of 8 channel relay?

When the coil is not energized, the normally open contact is the one that is off, while the normally closed one is the other that is on. Add a certain Voltage To the coil and Some currents Will pass through the coil thus Generating the electromagnetic effect.

What is the use of an 8-relay module?

The 8-Channel Relay Module is a convenient board that can be used to control high voltage, high current loads such as motors, solenoid valves, lamps, and AC loads. It is designed to interface with microcontrollers such as Arduino, PIC, etc. The relay terminal (COM, NO, and NC) is being brought out with a screw terminal.

Is the 8-channel relay normally open?

The Relay is a digital normally open switch that controls a relay capable of switching much higher voltages and currents than your normal Arduino boards. When set to LOW, the LED will light up and the relay will close allowing current to flow. The Peak voltage Capability is 250V at 10 amps.

How is a relay activated?

Relay consists of a coil, which receives an electric signal and converts it to a mechanical action and contacts that open and close the electric circuit.

How does the relay module work?

A power relay module is an electrical switch that is operated by an electromagnet. The electromagnet is activated By a separate low-power signal From a microcontroller. When activated, the electromagnet Pulls to either open or close an electrical Circuit.

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