1. How to wire a 12V relay?

12V relays are used for higher-end machinery or sensors that output a 12V signal. For example, a 12V relay can be used in a car's lead-acid battery system—if the battery gets discharged too much, the relay can cut off the connection to prevent further drainage. The digital control pin of a 12V relay must be connected to a 12V-capable output pin of a microcontroller or any controlling device such as a sensor to turn the relay ON.

2. How to use a 12V relay?

Applying 12V to the relay control pin closes the circuit between N/O and COM while opening the circuit between N/C and COM. Applying 0V or GND reverses the action.

3. How to test a 12V relay?

A 12V relay works correctly if it switches at its designed actuation voltage. You can test this by connecting a multimeter to the relay terminals and observing the voltage before and after the switching action.

4. How to trigger a 12V relay?

A 12V relay is triggered by applying a 12V signal to its control pin. Anything below 12V will keep the relay OFF, and anything higher than 12V may damage the relay.

5. How much current does a 12V relay draw?

The nominal current consumption of a 12V relay is typically around 30mA, depending on the model. Always check the specific relay datasheet for exact values.

6. Where can I find a 12V relay online?

12V relays are available from almost all electronics e-commerce stores, including Robocraze.

7. Where can I find a 12V relay nearby at a physical store?

You can find 12V relays at most local electronic component stores.

8. What is a 12V relay used for?

A 12-volt relay works like a tiny gatekeeper between a low-power control circuit and a higher-power device. When you send a small electrical signal to the relay, it flips an internal switch that can turn bigger appliances or circuits on and off. This makes it useful for controlling motors, lights, pumps, and other high-current devices using boards like Arduino, ESP32, or simple switches without putting stress on the control electronics.

9. How many channels do these relays have?

12 V relay modules come in different channel options depending on how many separate devices you want to control. You can find simple 1-channel modules for single appliances, as well as 2-channel, 4-channel, 8-channel, and even 16-channel versions for larger automation projects. Each channel represents one independent switching line, so more channels mean more devices you can operate from the same board.

10. Can I control AC appliances with these relays?

Yes, you can control AC appliances using 12 V relay modules as long as the relay's voltage and current ratings match the load. Many 12 V relays are built to handle common household AC levels like 220–240 V. These modules are typically used for fans, lamps, small pumps, and other AC equipment. Just make sure you wire everything safely, follow proper insulation practices, and never exceed the relay's rated limits. Safety first when dealing with mains electricity.

11. Are these relays compatible with microcontrollers?

Absolutely. 12 V relay modules are designed to work smoothly with microcontrollers such as Arduino, ESP8266, ESP32, Raspberry Pi, and others. The microcontroller sends a small logic signal to trigger the relay, and the relay safely switches the higher-power circuit. Many boards include opto-isolation and driver circuits to make this even easier and protect your electronics from voltage spikes. Just follow the wiring guide and share a common ground if required.

12V Relay Modules for Home Automation & Electronics

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Example product title

Rs. 20; Rs. 20
Unit price: per

Item Name	Price
12V Relay Cube	12
12V 8-Channel Relay board	310
Multifunction Delay Relay Switch Module	474
16 Channel 12V Relay Module Board	593
12 V 1 Channel Relay Board Module	53
SLA 12VDC 4Pin 30A Power Relay	65
4 Channel Relay Wireless Module	731
Single CHANNEL 12V RELAY MODULE 30AMP	162
Four CHANNEL 12V ULN2003 BASED RELAY BOARD MODULE	247
12 V 1 Channel Relay Board	47
12V 4CH Relay Board	209
12V 2CH Relay Board	80
Time Delay Relay Module (0-10 seconds)	60
2 CH 12V Relay Board	135
8-CH 12V ULN2003 Based Relay Board	424
4-CH 12V Relay Board	178
1-CH 12V Relay Board	60

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Frequently Asked Questions

1. How to wire a 12V relay?

2. How to use a 12V relay?

Applying 12V to the relay control pin closes the circuit between N/O and COM while opening the circuit between N/C and COM. Applying 0V or GND reverses the action.

3. How to test a 12V relay?

A 12V relay works correctly if it switches at its designed actuation voltage. You can test this by connecting a multimeter to the relay terminals and observing the voltage before and after the switching action.

4. How to trigger a 12V relay?

A 12V relay is triggered by applying a 12V signal to its control pin. Anything below 12V will keep the relay OFF, and anything higher than 12V may damage the relay.

5. How much current does a 12V relay draw?

The nominal current consumption of a 12V relay is typically around 30mA, depending on the model. Always check the specific relay datasheet for exact values.

6. Where can I find a 12V relay online?

12V relays are available from almost all electronics e-commerce stores, including Robocraze.

7. Where can I find a 12V relay nearby at a physical store?

You can find 12V relays at most local electronic component stores.

8. What is a 12V relay used for?

9. How many channels do these relays have?

10. Can I control AC appliances with these relays?

11. Are these relays compatible with microcontrollers?

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