5V/12V Relay Module | 10A AC DC Switching Board

5V/12V Relay Module – 10A AC/DC Switching Board for Arduino Control and Automation

This relay module product page includes 5V and 12V variants; SKU TB-Relay5V corresponds to the 5V option. The board lets a low-power controller switch a separate load circuit, making it useful for fans, pumps, lamps, solenoids, alarm outputs, and automation demos.

The current listing specifies 5VDC or 12VDC supply variants, current greater than 100mA, and relay load ratings of 250V 10A AC or 30V 10A DC. It pairs naturally with the ELAB Nano V3, sensors such as the 38K IR Receiver Module, and control panels using RGB status indicators.

Relays can control hazardous voltages and high currents, so use proper insulation, enclosures, fusing, and strain relief. For learning projects, start with low-voltage loads before attempting mains wiring.

Technical Specifications

Board Layout & Label Guide

• VCC – Positive module supply.
• GND – Module ground.
• IN1 / IN2 – Relay control input ports.
• Relay Contacts – Connect external load through COM, NO, or NC terminals if present.
• Indicator LED – Shows relay activation on many boards.
• Coil Variant – Match wiring to the selected 5V or 12V version.
• Isolation Gap – Keep load wiring separated from logic wiring.
• Safety Note – Never touch energized terminals.

Application Scenarios

1. Arduino Relay Blink

Switch a low-voltage load on and off for testing.

const int relayPin = 7;void setup() { pinMode(relayPin, OUTPUT);}void loop() { digitalWrite(relayPin, HIGH); delay(1000); digitalWrite(relayPin, LOW); delay(1000);}

2. Sensor-Controlled Relay

Turn on a relay when an analog sensor crosses a threshold.

const int sensorPin = A0;const int relayPin = 7;void setup() { pinMode(relayPin, OUTPUT);}void loop() { digitalWrite(relayPin, analogRead(sensorPin) > 600 ? HIGH : LOW); delay(200);}

3. Timed Output

Run a relay load for a fixed duration.

const int relayPin = 7;void setup() { pinMode(relayPin, OUTPUT);}void loop() { digitalWrite(relayPin, HIGH); delay(5000); digitalWrite(relayPin, LOW); delay(60000);}

Packing List

• 1 x 5V Relay Module when TB-Relay5V / 5V variant is selected

FAQ

Q: What does TB-Relay5V mean?
A: It is the 5V variant on the 5V/12V relay module page.

Q: What can it switch?
A: The listing specifies 250V 10A AC or 30V 10A DC loads.

Q: Can I use PWM?
A: No, relays are for slow on/off switching.

Q: Do I need common ground?
A: Yes, for the logic control side.

Q: What are NO and NC?
A: Normally open closes when activated; normally closed opens when activated.

Q: Can it switch mains voltage?
A: Only with proper safety practices and enclosure.

Q: Why does it click?
A: That is the mechanical relay contact moving.

Q: Why does my controller reset?
A: The relay coil may draw too much current or cause supply noise.