Relay 5V SPDT (Single Pole Double Throw)
Switching
Part Number / SKU: 5V Relay SPDT (SRD-05VDC-SL-C type)
📋 Technical Specifications
Type: Electromechanical Relay
Coil Voltage: 5V DC
Contact Type: SPDT (NO / NC / COM)
Switching Voltage: 250V AC / 30V DC
Switching Current: 10A (max)
Coil Current: ~70mA
Pins: 5 Pin
Mounting: Through Hole
🔹 Relay क्या है?
Relay एक ऐसा component है जो low voltage signal से high voltage devices को control करता है।
🔹 यह क्यों जरूरी है?
👉 Arduino / sensor सीधे 220V control नहीं कर सकते
👉 Relay बीच में लगाकर safe switching करते हैं
🔹 SPDT क्या होता है?
Single Pole Double Throw
एक input → दो output (NO और NC)
🔹 Pin / Terminal समझें
🔌 Coil Pins (2 pins)
Relay ON/OFF करने के लिए
🔌 Switching Pins (3 pins)
COM (Common)
NO (Normally Open)
NC (Normally Closed)
🔹 कैसे काम करता है?
Coil को 5V दिया → relay ON
COM → NO connect
OFF होने पर → COM → NC
🔹 Simple समझो
OFF → NC connected
ON → NO connected
🔹 कहाँ use होता है?
Fan control
Light ON/OFF
Motor control
Home automation
Arduino projects
🔹 Example
👉 Sensor detect → relay ON → light ON
🔹 Important Tips ⚠️
High voltage (220V) में सावधानी रखें
हमेशा diode protection use करें (1N4007)
Direct Arduino से relay मत चलाओ → transistor use करो
🔹 What is a Relay?
A relay is an electromechanical switch used to control high voltage devices using low voltage signals.
🔹 Why use it?
Microcontrollers cannot handle high voltage
Relay provides safe switching
🔹 What is SPDT?
Single Pole Double Throw
One input → two outputs (NO & NC)
🔹 Terminals
Coil Pins
Used to activate relay
Switching Pins
COM (Common)
NO (Normally Open)
NC (Normally Closed)
🔹 Working
When powered → COM connects to NO
When OFF → COM connects to NC
🔹 Applications
Home automation
Light control
Motor switching
Arduino projects
🔹 Tips
Use diode protection
Use transistor for control
Handle high voltage carefully