How to Use 1channel 5V 30A relay: Examples, Pinouts, and Specs

The NEROMART NER-13709 is a single-channel relay module designed to control high-power devices using low-power control signals. Operating at 5V, this relay can handle loads of up to 30A, making it ideal for switching high-current devices such as motors, heaters, lights, and other appliances. Its compact design and high current capacity make it a versatile component for home automation, industrial control systems, and DIY electronics projects.

• Home automation (e.g., controlling lights, fans, or appliances)
• Industrial equipment control
• Motor and pump control
• DIY electronics and Arduino-based projects
• Smart home systems

Below are the key technical details of the NEROMART NER-13709 relay module:

The relay module has 6 pins and terminals, as described in the table below:

1. Power the Relay Module: Connect the VCC pin to a 5V DC power supply and the GND pin to the ground.
2. Control Signal: Connect the IN pin to a microcontroller (e.g., Arduino) or a control circuit. The relay is triggered when the IN pin receives a LOW signal.
3. Load Connection:
   • Connect the load's live wire to the COM terminal.
   • Use the NO terminal if the load should be off by default and turn on when the relay is triggered.
   • Use the NC terminal if the load should be on by default and turn off when the relay is triggered.
4. Isolation: Ensure proper electrical isolation between the control circuit and the high-power load to prevent damage or hazards.

• Power Supply: Ensure the relay module is powered with a stable 5V DC supply.
• Load Ratings: Do not exceed the maximum load current (30A) or voltage (250V AC / 30V DC).
• Heat Dissipation: For high-current loads, ensure proper ventilation or heat dissipation to prevent overheating.
• Safety: Always disconnect power before wiring the relay to avoid electric shock.

Below is an example of how to control the relay using an Arduino UNO:

// Example: Controlling a 1-Channel 5V 30A Relay with Arduino UNO
// Manufacturer: NEROMART
// Part ID: NER-13709

const int relayPin = 7; // Pin connected to the relay module's IN pin

void setup() {
  pinMode(relayPin, OUTPUT); // Set the relay pin as an output
  digitalWrite(relayPin, HIGH); // Ensure the relay is off initially
}

void loop() {
  digitalWrite(relayPin, LOW); // Turn the relay ON (active low)
  delay(5000); // Keep the relay on for 5 seconds
  digitalWrite(relayPin, HIGH); // Turn the relay OFF
  delay(5000); // Keep the relay off for 5 seconds
}

• The relay is active low, meaning it turns on when the control signal is LOW.
• Use an external power supply if the relay draws more current than the Arduino can provide.

1. Relay Not Switching

   • Cause: Insufficient control signal voltage or current.
   • Solution: Ensure the IN pin receives a proper LOW signal (below 0.8V) to activate the relay.

2. Load Not Turning On/Off

   • Cause: Incorrect wiring of the load to the relay terminals.
   • Solution: Double-check the connections to the COM, NO, and NC terminals.

3. Overheating

   • Cause: Exceeding the relay's maximum current rating.
   • Solution: Ensure the load does not exceed 30A. Use a heat sink or cooling fan if necessary.

4. Arduino Resets When Relay Activates

   • Cause: Voltage spikes or insufficient power supply.
   • Solution: Add a flyback diode across the relay coil and use a decoupling capacitor near the Arduino's power pins.

1. Can I use this relay with a 3.3V microcontroller?

   • Yes, the relay can be triggered with a 3.3V control signal, but ensure the VCC pin is powered with 5V.

2. Is the relay safe for inductive loads like motors?

   • Yes, but you should use a flyback diode or snubber circuit to protect the relay from voltage spikes.

3. Can I control multiple relays with one Arduino?

   • Yes, as long as each relay is connected to a separate digital pin and the Arduino can supply sufficient current.

4. What happens if I connect both NO and NC terminals?

   • This is not recommended. Use either NO or NC depending on your application, but not both simultaneously.

By following this documentation, you can effectively use the NEROMART NER-13709 relay module in your projects.