5V Dual Channel Relay Module with Optocoupler Good Quality

  1. Low-Level Trigger Relay Module
  2. Two separate LEDs for On/Off indication of the Relay.
  3. Triggering input voltage 3.3V – 5V
  4. Two separate LEDs for On/Off indication of the Relay
  5. Triggering input voltage 3.3V – 5V 4)
  6. Back EMF protection
  7. Back EMF protection 2 LEDs to indicate when relays are ON.
  8. Works with logic-level signals from 3.3V or 5V devices
  9. Opto isolation circuitry
  10. Module with diode current protection, short response time
  11. AC Control Voltage: 250V @max.10A
  12. DC Control Voltage: 30V @max. 10A

55.93 (Exc. GST)


About 5V Dual Channel Relay Module

This is a 2 Channel isolated 5V 10A relay module Optocoupler for Arduino PIC ARM. It can be used to control various appliances and other types of equipment with a large current. It can be controlled directly with 3.3V or 5V logic signals from a microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic).

This relay has a 1×4 (2.54mm pitch) pin header for connecting power (5V and 0V), and for controlling the 2 relays.

The pins are marked on the PCB as:

  • GND – Connect 0V to this pin.
  • IN1 – Controls relay 1, active Low Relay will turn on when this input goes below about 2.0V
  • IN2 – Controls relay 2, active Low Relay will turn on when this input goes below about 2.0V
  • VCC – Connect 5V to this pin. Is used to power the optocouplers
Note: This 5V Dual Channel Relay Module is for low-level triggers only. 
About high-level and low-level-triggered modes:
  1. High-level trigger refers to the signal voltage between input and trigger, and can be understood as a signal input with VCC cathode short-circuit triggered away;
  2. Low-level trigger refers to the signal voltage between the input terminal and Earth OV trigger, which can be understood as the signal input terminal and the GND negative electrode short circuit triggering away the 1-channel relay module connection

Jumper Instruction = The relay can be turned on when we connect 5v to one end and the other to -5v / Gnd, while talking about the jumper, if we short the VCC and the middle pin, then our relay will act as high level-triggered relay means that when we will apply + 5V input on its input pin it will be turned on and when the jumper will be set to “middle and GND”, it will act as a low-level triggered relay, It means that relay will be triggered when we implement the 5V / GND on its input pin.

Features :

  1. 2 LEDs to indicate when relays are ON.
  2. Works with logic-level signals from 3.3V or 5V devices
  3. Opto isolation circuitry
  4. Module with diode current protection, short response time
  5. Around the board with 4 mounting holes, hole diameter 3. 1 mm, easy installation and fixing

Dual-Channel Relay Module Pinout

Pin Number

Pin Name




Input for isolated power supply for relay coils



Input for directly powering the relay coils



Input ground reference



Input ground reference



Input to activate the first relay



Input to activate the second relay



VCC to power the optocouplers, coil drivers, and associated circuitry

Dual-Channel Relay Module Specifications

  • Supply voltage – 3.75V to 6V
  • Trigger current – 5mA
  • Current when relay is active – ~70mA (single), ~140mA (both)
  • Relay maximum contact voltage – 250VAC, 30VDC
  • Relay maximum current – 10A

Alternate Relay Modules

Single-channel relay module, four-channel relay module, eight-channel relay module.

Alternate Modules for AC switching

Solid State Relay module, SCRs, TRIACs

Components present on a 5V Dual Channel Relay Module

The following are the major components that would find on a Dual channel Relay module, we will discuss them in detail further in this article.

5V Relay, Optocoupler, Diodes, Transistors, Resistors, LEDs, Male Headers, 3-pin Terminal connectors, etc.

Understanding 5V Dual-Channel Relay Module

The dual-channel relay module contains switching relays and the associated drive circuitry to make it easy to integrate relays into a project powered by a microcontroller. On the left are two terminal blocks, which are used to connect mains wires to the module without soldering.

Next, come to the two relays. As marked on the body of the relay, the relay coil is rated for 5VDC, and the contacts are rated for 10A at 250VAC or 30VDC, or 125VAC or 28VDC.

The switching transistors amplify the signal from the inputs enough to drive the relay. The freewheeling diodes prevent voltage spikes across the switching transistors. The status LEDs turn on when the relay is active and indicate switching. The optocouplers are used to provide additional isolation between the input and the relays. The isolation can be selected using the VCC/JDVCC jumper.

The input jumper has two input and two power pins and can be easily used to connect to jumper wires and other microcontrollers and sensors.

Internal Circuit Diagram for Dual-Channel Relay Module

The circuit on the board is as follows:

This same circuit is replicated twice on the module. There are several differences when compared to the single-channel relay module. The first is that the optocoupler and relay can have a separate power supply from the input. This is selected using the JD-VCC jumper – if the jumper is shorted, then the relay coil and optocoupler output are connected to the signal VCC. If the jumper is left open, a separate power supply can be provided to the relay coil through the JD-VCC pin.

The second is that the input is active low, meaning that the relay coil is activated only when the input is low. This is because the optocoupler input and the indicator LED are chained to VCC. When the input is high, the voltage difference across the chain is 0V and no current can flow, but when the input is low, supply voltage appears across the chain and the optocoupler output conducts, supplying current to the base of the drive transistor, turning the relay on.

How to use Dual-Channel Relay Module

The dual-channel relay module can be used to switch mains powered loads from the pins of a microcontroller. Since there are two channels on the same board, two separate loads can be powered. This is useful for home automation.

The loads can be connected as follows:

In this diagram, the relay on the left (channel 1) is connected in a regular fashion with the load and source going between common and normally open, so when the relay is activated, the load is powered. On the right channel (channel 2), the load and source are connected between common and normally closed, which means that the load is powered by default till the relay is activated.

If the load is connected to the normally closed contact, then the input polarity ‘reversal’ can be fixed – the load is powered on when the input is high, and the load is powered off when the input is low. This method, however, wastes some current since the relay coil draws current when the load is switched off.

Dual-Channel Relay Module Basic Troubleshooting

If either of the relays does not turn on:

  1. The contacts might be welded due to overcurrent/arcing. Shaking the module firmly might help unstick the contacts
  2. The driver circuitry might have been damaged due to overvoltage.
  3. Input polarity might be incorrect.
  4. Jumper might not have been moved to the correct position

Package Includes :

1 x 2 Channel isolated 5V 10A relay module with Optocoupler

Weight 0.027 kg
HSN Code


Relay Type Low Level Trigger
Logic Input (V) 3.3 ~ 5
Trigger Voltage (VDC) 5
Switching Voltage (VAC) 250@10A
Switching Voltage (VDC) 30@10A
Length (mm) 50.6
Width (mm) 39
Height (mm) 19.5
Weight (gm) 28
Shipment Weight 0.03 kg
Shipment Dimensions 6 × 5 × 3 cm

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