---
product_id: 102332618
title: "4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel)"
brand: "knacro"
price: "R615"
currency: ZAR
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.za/products/102332618-4-channel-dc-5v-relay-module-high-low-level-triggering
store_origin: ZA
region: South Africa
---

# 30A high-power load capacity LED indicators for real-time channel status Optocoupler isolation for interference-free control 4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel)

**Brand:** knacro
**Price:** R615
**Availability:** ✅ In Stock

## Summary

> ⚙️ Command your automation like a pro—power, precision, and protection in one module!

## Quick Answers

- **What is this?** 4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel) by knacro
- **How much does it cost?** R615 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/102332618-4-channel-dc-5v-relay-module-high-low-level-triggering)

## Best For

- knacro enthusiasts

## Why This Product

- Trusted knacro brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Visual Feedback:** LED indicators on each channel keep you instantly informed
- • **Powerhouse Control:** Handles up to 30A at DC 30V / AC 250V for heavy-duty automation
- • **Interference Immunity:** Optocoupler isolation ensures stable, noise-free operation
- • **Industrial-Grade Safety:** Isolation slots meet international safety standards for peace of mind
- • **Universal Compatibility:** Supports both high and low-level triggering for versatile integration

## Overview

This 4-channel 5V relay module delivers robust control with 30A load capacity at DC 30V or AC 250V, featuring optocoupler isolation to eliminate interference and LED indicators for each channel. Designed for PLC automation, industrial systems, and smart home projects, it meets international safety standards with isolated control and load areas.

## Description

Supply voltage: DC 5V / 12V / 24V; Quiescent current: 5mA; Maximum operating current: 190mA (5V) / 80ma(12v) / 50ma(24v); Trigger mode: high and low level trigger; Load voltage: DC 30V / AC250; Load current: 30A; Relay life: more than 100,000 times; Product weight:46g (1ch) 200g(2ch) 385g(4ch) 780(8ch); Size:72 * 40 *22 (1ch)/ 70 * 72 * 22mm(2ch)/129 * 72 * 22mm (4ch) /252 * 72 * 22mm(L * W * H); Mounting hole size:44.5x27.5MM(1CH)/67.5*69.5MM(2CH)/126.5*69.5(4CH)/249.5*69.5(8CH) (LxW);  Module Interface Description: 1. DC +: DC power supply positive; 2. DC -: DC power supply module negative; 3. IN: Signal input terminal(support High/Low Level switch freely); 4. Normally open (NO): Relay normally open; 5. Common terminal (COM): Relay common; 6. Normally closed terminal (NC): relay normally closed terminal;  Trigger voltage range: DC 05V: Low-level trigger: 0-2V relay ON;  3-5V relay OFF; High-level trigger: 3.3-5V relay ON;  0-2.5V relay OFF; DC 12V: Low-level trigger: 0-5V relay ON; 6-12V relay OFF; High-level trigger: 6-12V relay ON; 0-5.5V relay OFF; DC 24V: Low-level trigger: 0-12V relay ON;  12-24V relay OFF; High-level trigger: 12-24V relay ON;  0-8.5V relay OFF;  Package Included: 1x 30A Relay Module

## Features

- Using high-power relay, the maximum control load DC 30V 30A / AC 250V 30A;
- With each optocoupler isolation, anti-interference ability.
- In line with international safety standards, the control area and the load area with isolation slot. Each channle has a relay on LED indication.
- Each channle has a relay on LED indication.
- Product Applications: PLC automation equipment control, industrial system control, logistics network control, home intelligent product control, electronic enthusiasts to develop experiments, all kinds of circuit modification

## Product Details

- **Connector Type:** Screw
- **Contact Material:** Silver Alloy
- **Contact Type:** Normally Open
- **Current Rating:** 30 Amps
- **Mounting Type:** PCB Mount

## Images

![4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel) - Image 1](https://m.media-amazon.com/images/I/81+QkwdzHtL.jpg)
![4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel) - Image 2](https://m.media-amazon.com/images/I/812YoCA5XYL.jpg)
![4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel) - Image 3](https://m.media-amazon.com/images/I/81WtXPIb3uL.jpg)
![4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel) - Image 4](https://m.media-amazon.com/images/I/81qs56zYw4L.jpg)
![4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel) - Image 5](https://m.media-amazon.com/images/I/81PfNOC5mbL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very solid relay kit. Nothing cheap nothing flimsy.
*by A***R on December 29, 2018*

This is a "heavy duty" relay kit. Very solid. 3.2V friendly, this means you can trigger the ON/OFF using a 3.2V IoT device. The High-level trigger works as advertised. I am designing a home thermostat, for the thermostat 24V AC this relay kit is a little too much, still I love it.

### ⭐⭐⭐⭐⭐ Works well with Arduino UNO.
*by S***K on November 7, 2019*

Works great. I used this to switch 110 volt lights on and off with a Arduino UNO for a Halloween display, it probably cycled hundreds of times in the course of the evening without a problem.

### ⭐⭐⭐⭐⭐ Arduino compatible
*by M***K on January 12, 2020*

I used this with my Arduino to make an induction furnace where I needed a big relay for the current I'm drawing through it. It failed at half the current rating.

## Frequently Bought Together

- KNACRO 4-Channel DC 5V Relay Module High-Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control(5V, 4-Channel)
- SunFounder Lab 4 Relay Module 5V 4 Channels Relay Module Compatible with Arduino R3 1280 Arm PIC AVR STM32

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-22*