1/2/4/8 Channel Solid State Relay Module SSR Low Level 5V 2A Arduino - Image 1
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1/2/4/8 Channel Solid State Relay Module SSR Low Level 5V 2A Arduino

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Description

Introducing our versatile Solid State Relay (SSR) Modules, available in 1, 2, 4, and 8-channel configurations, designed to provide seamless control and reliability for your projects. Engineered for efficiency and compatibility with Arduino and other microcontrollers, these SSR Modules offer a superior solution for a range of applications.

Key Features:

  1. High-Quality Performance: Each 5V solid state relay boasts a remarkable 240V 2A capacity, complemented by an integrated resistive fuse for enhanced safety and durability.
  2. Flexible Sizing Options: Choose the perfect fit for your setup:
    • 1-channel: 25 * 34 * 25 (L * W * H)
    • 2-channel: 55 * 33 * 25 (L * W * H)
    • 4-channel: 57 * 55 * 25 (L * W * H)
    • 8-channel: 106 * 56 * 25 (L * W * H)
  3. Effortless Integration: Powered by a 5V DC input (160mA), these modules facilitate easy compatibility with various systems.
  4. Precise Control Signal: Tailor your control with high and low-level trigger options:
    • High-Level: Relay ON with 0-2.5V signal, OFF with 3.3-5V signal
    • Low-Level: Relay OFF with 0-2.5V signal, ON with 3.3-5V signal
  5. User-Friendly Design: Experience seamless connectivity with 2.54CM pins and the convenient blue KF301 terminal control lines.

Input Section:

  • DC +: Connect to positive power supply (matching relay voltage)
  • DC -: Connect to negative power supply
  • CH1/CH2/CH3/CH4: Signal trigger terminals for each relay module (low-level trigger active)

High and Low Trigger Explanation:

  • High-Level Trigger: Voltage between signal trigger side (IN) and negative power supply is positive, resulting in relay activation upon reaching trigger voltage.
  • Low-Level Trigger: Voltage between signal trigger terminal and negative terminal of power supply is ≤0V, or lower than positive terminal voltage. Relay activates when trigger voltage is sufficiently low.

Electrical Parameters:

Channels Voltage Quiescent Current Operating Current Trigger Voltage Trigger Current
1 5V 0mA 12.5mA 0-2.5V 2mA
2 5V 0mA 22.5mA 0-2.5V 2mA
4 5V 0mA 48mA 0-2.5V 2mA
8 5V 0mA 102mA 0-2.5V 2mA

Product Manual:

  1. Module Power Supply: Ensure a matching DC voltage for the power supply and relay voltage.
  2. Wiring Method: Activate the relay by providing the appropriate signal trigger level. The device will then energize and perform its intended function.

Precautions:

  1. Module Power Supply: Exclusive use of 5V DC power supply is mandatory.
  2. Module Control Terminal Voltage: These modules are optimized for AC current control and cannot regulate DC currents.

Elevate your project with our feature-rich Solid State Relay Modules, offering optimal control and precision. Choose the configuration that aligns with your needs and experience enhanced performance like never before.

📌 Code Examples & Usage – Solid State Relay (SSR) Module (1 / 2 / 4 / 8 Channel)

📋 Overview

This solid state relay (SSR) module allows a low-voltage control signal from a microcontroller to safely switch AC or DC loads using solid-state electronics instead of mechanical contacts.

SSR modules are ideal for:

  • Silent switching

  • High switching frequency

  • Long service life (no mechanical wear)

  • Resistive AC loads

  • Automation & control systems

Available in 1, 2, 4, and 8 channel versions.

⚠ IMPORTANT – Read Before Use

🚨 This is a LOW-POWER SSR module

  • Control voltage: 5V (logic input)

  • Trigger type: LOW-level trigger

  • Output current: up to 2A per channel

  • Output type: solid-state (triac or MOSFET, module dependent)

⚠ Not suitable for high-current loads
⚠ Not suitable for inductive loads without proper precautions

⚙ Key Characteristics

  • Silent operation (no clicking)

  • Long lifespan

  • Fast switching

  • Optically isolated inputs (module dependent)

  • Logic compatible with Arduino & ESP32

🔌 Control Side Wiring (Low Voltage)

Control Pins

Pin Function
IN1…INx Relay control inputs
VCC 5V logic supply
GND Ground

📌 LOW-level trigger

  • LOW (0V) → Relay ON

  • HIGH (5V / 3.3V) → Relay OFF

ESP32 (3.3V logic) works reliably.

🔌 Load Side Wiring (Output)

Each channel has two output terminals:

Terminal Function
LOAD+ / AC1 Load input
LOAD- / AC2 Load output

📌 There is no polarity for AC loads
📌 For DC SSRs, observe polarity if marked

🧪 1️⃣ Arduino Example – Single Channel Control

const int ssrPin = 7;

void setup() {
pinMode(ssrPin, OUTPUT);
digitalWrite(ssrPin, HIGH); // SSR OFF (low-level trigger)
}

void loop() {
digitalWrite(ssrPin, LOW); // SSR ON
delay(2000);

digitalWrite(ssrPin, HIGH); // SSR OFF
delay(2000);
}

✔ Silent switching
✔ Ideal for lamps, heaters, and resistive loads

🧪 2️⃣ Arduino Example – Multiple Channels

int ssrPins[] = {2, 3, 4, 5};

void setup() {
for (int i = 0; i < 4; i++) {
pinMode(ssrPins[i], OUTPUT);
digitalWrite(ssrPins[i], HIGH); // All OFF
}
}

void loop() {
for (int i = 0; i < 4; i++) {
digitalWrite(ssrPins[i], LOW); // ON
delay(500);
}

for (int i = 0; i < 4; i++) {
digitalWrite(ssrPins[i], HIGH); // OFF
delay(500);
}
}

Works with 2, 4, or 8 channel boards.

🧪 3️⃣ ESP32 Example

const int ssrPin = 18;

void setup() {
pinMode(ssrPin, OUTPUT);
digitalWrite(ssrPin, HIGH);
}

void loop() {
digitalWrite(ssrPin, LOW);
delay(1000);
digitalWrite(ssrPin, HIGH);
delay(1000);
}

✔ 3.3V logic compatible
✔ No level shifter required

⚡ AC Load Notes (VERY IMPORTANT)

Most SSR modules use triac outputs, which means:

✔ Best for AC resistive loads

  • Heaters

  • Incandescent lamps

  • Some power supplies

⚠ Not recommended for:

  • Induction motors

  • Transformers

  • Large solenoids

  • Loads with high inrush current

👉 For inductive loads, use:

  • Mechanical relays

  • Zero-cross SSRs rated for inductive loads

  • Snubber circuits

🔥 Heat & Derating (Critical)

SSR modules generate heat when conducting.

✔ Recommended:

  • Keep load current below maximum rating

  • Provide airflow

  • Use a heatsink for continuous loads

  • Do not enclose tightly without ventilation

Rule of thumb:

Continuous current ≤ 50–60% of rated value

🧠 SSR vs Mechanical Relay (Quick Comparison)

Feature SSR Mechanical Relay
Noise Silent Clicks
Lifespan Very long Limited
Speed Fast Slow
Power loss Higher Low
Inductive loads ❌ ✅
Cost Higher Lower

🧠 Tips & Best Practices

✔ Use SSRs for frequent switching
✔ Use mechanical relays for motors
✔ Always confirm load type (AC/DC)
✔ Keep wiring short and secure
✔ Use fuses on AC loads

Additional information

Weight 100 g
Dimensions 260 × 160 × 50 mm
Channels

1, 2, 4, 8

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