4 Channel 5V Relay Module 250V 10A Relays for Arduino, Automation & IoT

$8.39

Electronics for IoT, Prototyping & DIY

250V/10A 4 Channel SPDT Power Relay Module – 5V Control, Active Low, Arduino & Microcontroller Compatible

This 4-channel 5V relay module lets you control up to four high-power AC or DC loads directly from a microcontroller like an Arduino, Raspberry Pi, or ESP32. Each channel uses a Single-Pole Double-Throw (SPDT) relay rated for 250V AC at 10A, with both Normally Open (NO) and Normally Closed (NC) contacts. This is the direct-drive model without optocoupler isolation -- just connect the simple 6-pin header (GND, IN1–IN4, VCC) and you\'re ready to switch loads.

⚡ Active Low Logic: Pull the input pin LOW to turn the relay ON. Each channel has a red LED that lights up when its relay is activated. Initialize your output pins HIGH in setup() to keep all relays OFF at startup. 🔧 How It Works

Connect the module\'s GND and VCC pins to your microcontroller\'s GND and 5V
Connect IN1–IN4 to any digital output pins on your microcontroller
Wire your high-power load to the relay\'s screw terminals (COM and NO or NC)
Pull an input pin LOW in your code to energize that relay -- the NO contact closes, connecting COM to NO, and the channel\'s red LED lights up
Pull the input pin HIGH to de-energize the relay -- COM returns to NC

⚡ Key Features

4 Independent Channels -- Control up to four separate high-power devices from a single module
SPDT Relay Contacts -- Each relay provides COM, NO (Normally Open), and NC (Normally Closed) terminals
250V AC / 10A Switching -- Each channel handles up to 250V AC at 10A, 125V AC at 15A, or 30V DC at 10A
Active Low Inputs -- Pull the input pin LOW to activate the relay, compatible with most microcontrollers
5V Control Logic -- Powered and controlled directly from a 5V microcontroller
LED Status Indicators -- Each channel has a red LED that illuminates when the relay is activated
Simple 6-Pin Interface -- Single input header with GND, VCC, IN1, IN2, IN3, IN4
Screw Terminals -- Secure, tool-tightened connections for high-power load wiring
Mounting Holes -- Four 3.1mm mounting holes for secure installation

📐 SpecificationsNumber of Channels4Relay TypeSPDT (Single-Pole Double-Throw)Control SignalActive Low (LOW = relay ON)Control Voltage5V DCControl Current50–60 mA per channelMax Switching Voltage (AC)250V ACMax Switching Voltage (DC)30V DCMax Switching Current10A (250V AC / 30V DC), 15A (125V AC)Relay ContactsCOM, NO (Normally Open), NC (Normally Closed)Optocoupler IsolationNo (direct transistor drive)Status Indicators4 × Red LEDs (one per channel)Input Connector6-pin header (GND, VCC, IN1, IN2, IN3, IN4)Mounting Holes4 × 3.1mm diameterBoard DimensionsApprox. 76 × 56 × 17 mm (3.0 x 2.2 x 0.67 inches) L × W × HWeightApprox. 60g 📦 What\'s in the Box

1x 5V 4-Channel SPDT Power Relay Module

Jumper wires, microcontroller, power supply, and mounting hardware are not included.

🛒 What You\'ll Need

Microcontroller -- Arduino Uno, Mega, Nano, ESP32, Raspberry Pi, or similar 5V-compatible board
Jumper wires -- Female-to-male or male-to-male depending on your setup
5V power supply -- Recommended if running all four relays simultaneously (500 mA or more)
Load and power source -- The AC or DC device you want to switch, along with its power source

🔌 Compatible With

Arduino Uno, Mega, Nano, Leonardo, and other 5V Arduino boards
Raspberry Pi (via 5V pin and GPIO -- Pi GPIO is 3.3V, may need level shifting)
ESP32 / ESP8266 (3.3V logic -- test reliability or use a level shifter)
STM32, PIC, AVR, ARM, MSP430, and other 5V-compatible microcontrollers

🎯 Typical Applications

Home automation -- control lights, fans, heaters, and appliances
Irrigation systems -- switch solenoid valves for automated watering
Industrial control -- activate motors, pumps, or solenoids
IoT projects -- combine with Wi-Fi modules for remote appliance control
Robotics -- control high-power motors or actuators
Automotive -- switch 12V accessories like lights, horns, or cooling fans
Security systems -- control door locks, alarms, or sirens

💡 Power Tip: Each relay channel draws 50–60 mA. With all four channels active, the module draws ~240–250 mA. If you experience unreliable switching or microcontroller resets, use an external 5V power supply (500 mA+) for the module and share a common GND with your microcontroller. ⚠️ Important Notes

No optocoupler isolation: Control inputs connect directly to relay driver transistors without galvanic isolation. For applications where isolation is critical, consider the optocoupler-isolated version.
Active Low operation: LOW = ON, HIGH = OFF. If your relays seem to work \"backwards,\" check your code logic.
Not suitable for PWM or rapid switching: Mechanical relays have a limited lifespan (~100,000 cycles) and ~10ms switching speed. Use solid-state relays or MOSFETs for high-speed switching.
Maximum ratings are absolute maximums: For long-term reliability, operate at no more than 80% of rated current (8A at 250V AC).
3.3V microcontrollers: This module is designed for 5V logic. Reliable operation at 3.3V is not guaranteed -- test thoroughly or use a logic level shifter.
High-voltage safety: This module can switch mains-level AC voltages (up to 250V AC). Always disconnect power before making or changing high-voltage connections. If you are not experienced with high-voltage wiring, consult a qualified electrician.

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