--- 4 Channel Relay Module Library For Proteus 2021 May 2026

Title: 4 Channel Relay Module Library for Proteus – Download & Tutorial

Post:

If you're working on an Arduino, PIC, or STM32 project in Proteus and need to control high-power devices, a 4 Channel Relay Module is essential. But Proteus doesn’t come with this module by default.

Good news: You can easily add a custom 4 Channel Relay Module library to Proteus.

🔧 What’s included in the library?

• 4 Channel Relay Module (5V / 12V variants)
• Optocoupler isolation representation
• Terminal blocks for COM, NO, NC
• Input pins (IN1, IN2, IN3, IN4)
• VCC & GND power pins

📥 Download Link: [Insert your link here]

How to add the library to Proteus:

1. Download the .IDX and .LIB files
2. Copy them to:
   • C:\Program Files (x86)\Labcenter Electronics\Proteus 8\LIBRARY
3. Restart Proteus
4. Search for "4 Channel Relay" in the component picker

Test circuit example:

• Connect IN1 → Arduino Pin 7
• VCC → +5V
• GND → GND
• Connect a lamp/bulb to COM & NO

Pro tip: Use a 1k resistor on each input pin for current limiting if driving directly from a microcontroller. --- 4 Channel Relay Module Library For Proteus

📌 Note: This is a simulation model – for real hardware, use an external 5V supply if the load is high.

Let me know if you face any errors while adding the library!

What’s Inside the Library Component?

A typical custom 4-channel relay module for Proteus includes:

• 4 relays (usually SPDT type)
• 4 optocouplers (e.g., PC817) for isolation
• 4 transistors (e.g., BC547 or 2N2222) as switches
• 4 LEDs for channel status indication
• 4 current-limiting resistors for LEDs and transistor bases
• Control pins: VCC (5V), GND, IN1, IN2, IN3, IN4
• Load connection terminals: COM, NO, NC for each relay

Note: In simulation, optocouplers and transistors can often be simplified or replaced with behavioral models to speed up the simulation while maintaining logical correctness. Title: 4 Channel Relay Module Library for Proteus

Key Components on the Board:

1. 4x Electromagnetic Relays (e.g., SRD-05VDC-SL-C).
2. 4x Optocouplers (e.g., PC817) – for electrical isolation.
3. 4x NPN Transistors (e.g., BC547 or S8050) – current drivers.
4. 4x Flyback Diodes (e.g., 1N4148 or 1N4007) – to absorb back EMF.
5. 4x Base Resistors (~1kΩ to 10kΩ) – to limit current to transistor base.
6. 2x Power Indicator LEDs (for VCC and JD-VCC lines).
7. Header Pins:
   • VCC (5V/12V) – Relay logic supply.
   • GND – Common ground.
   • IN1, IN2, IN3, IN4 – Active High (or Low) control signals.
   • JD-VCC – Isolated supply for relay electromagnet (often jumpered to VCC).

2. How to Add the Library to Proteus

Since this component is not standard in every version of Proteus, you usually need to download the library files.

Required Files:

• Relay.lib (Library file)
• Relay.IDX (Index file)
• Relay.HEX (Simulation model file - optional depending on the library version)

Installation Steps:

1. Download: Find a reliable source (such as The Engineering Projects or similar electronics forums) and download the zip folder for the "Proteus Relay Library".
2. Copy Files: Extract the zip file. You will likely see files named TEP_4_Channel_Relay.lib and TEP_4_Channel_Relay.IDX (names may vary).
3. Paste into Library Folder:
   • Navigate to your Proteus installation folder (usually C:\Program Files (x86)\Labcenter Electronics\Proteus x Professional\LIBRARY).
   • Paste the .lib and .IDX files directly into this folder.
4. Restart Proteus: Close and reopen Proteus ISIS for the changes to take effect.

Capabilities:

• Digital Logic Simulation: Accurate for low-speed switching (< 10 Hz).
• Mixed-Mode Simulation: Simulate relay contacts switching analog signals (e.g., audio, sensor lines).
• Interactive Debugging: Toggle IN1 pin manually using logic state probes.

Steps to Use in a Project:

1. Open Proteus ISIS.
2. Go to Library → Pick Device/Symbol (or press P).
3. Search for Relay 4 or 4 Channel Relay.
4. Click OK and place the component on the schematic.

Circuit in Proteus:

1. Place ARDUINO UNO (or use ATMEGA328P).
2. Place Relay_4Channel component from your library.
3. Connect Arduino Digital Pins 2,3,4,5 to IN1...IN4 of the relay module.
4. Connect VCC to +5V and GND to GND.
5. Connect JD-VCC to +5V (jumpered).
6. Connect COM1 to +12V (simulated DC load) and NO1 to a LAMP model from Proteus library. Repeat for other channels.

6. Practical Simulation Example: Arduino Controlled 4-Channel Relay

Scenario: Control 4 bulbs from an Arduino Uno. 4 Channel Relay Module (5V / 12V variants)

Step 4: Verify Installation

1. Click on the "Component Mode" (P button).
2. In the Keywords search bar, type: 4 channel or 4 relay.
3. You should see your new module. If not, click "Pick from Libraries" and browse the category "Relays" or "Modules".