The MY4N is an electromechanical relay with four normally open (NO) contacts, designed for switching applications in various electronic circuits. It features a compact design, high reliability, and the ability to handle a wide range of voltages and currents. This relay is commonly used in automation systems, industrial control panels, and general-purpose switching applications. Its robust design ensures consistent performance in demanding environments.
This circuit consists of a 5V battery powering a 4-channel relay module, which controls four LEDs (red, yellow, green, and blue) through individual resistors. Each relay channel is activated by a corresponding SPST toggle switch, allowing manual control of the LEDs.
Open Project in Cirkit Designer
This circuit uses an Arduino UNO to control a 4-channel relay module, which in turn controls four bulbs. Each relay channel is connected to a bulb and can be toggled by corresponding micro switches, allowing for manual control of the bulbs.
Open Project in Cirkit Designer
This circuit is designed to control four AC bulbs using an ESP8266 NodeMCU microcontroller and a 4-channel relay module. The NodeMCU's digital pins (D0 to D3) are connected to the relay module's input pins (IN1 to IN4), allowing the microcontroller to switch the relays on and off, thereby controlling the power to the bulbs. The common (COM) pins of the relay are interconnected, and each Normally Open (NO) pin is connected to one of the AC bulbs, which share a common neutral (N) connection.
Open Project in Cirkit Designer
This circuit is a Bluetooth-controlled relay system using an Arduino Nano and an HC-05 Bluetooth module. The Arduino Nano receives commands via Bluetooth to control four relays, which in turn control an AC bulb, a DC bulb, and two sockets. The system is powered by a 220V AC supply converted to 5V DC.
Open Project in Cirkit Designer| Parameter | Value |
|---|---|
| Contact Configuration | 4PDT (Four Pole Double Throw) |
| Contact Type | Normally Open (NO) |
| Coil Voltage Range | 6V DC, 12V DC, 24V DC, 48V DC, 110V AC, 220V AC |
| Contact Rating | 5A at 250V AC / 30V DC |
| Coil Resistance | Varies by coil voltage (e.g., 160Ω for 12V DC) |
| Operating Time | Approx. 20 ms |
| Release Time | Approx. 20 ms |
| Insulation Resistance | ≥ 100 MΩ at 500V DC |
| Dielectric Strength | 2000V AC for 1 minute |
| Mechanical Life | 10,000,000 operations |
| Electrical Life | 100,000 operations (at rated load) |
| Ambient Temperature | -40°C to +70°C |
| Mounting Style | Plug-in or PCB mount |
The MY4N relay has a total of 14 pins, which are typically arranged in a rectangular configuration. The pinout is as follows:
| Pin Number | Description |
|---|---|
| 1 | Coil Terminal 1 |
| 2 | Coil Terminal 2 |
| 3 | Common Contact for Pole 1 |
| 4 | Normally Open (NO) Contact for Pole 1 |
| 5 | Common Contact for Pole 2 |
| 6 | Normally Open (NO) Contact for Pole 2 |
| 7 | Common Contact for Pole 3 |
| 8 | Normally Open (NO) Contact for Pole 3 |
| 9 | Common Contact for Pole 4 |
| 10 | Normally Open (NO) Contact for Pole 4 |
| 11-14 | Not connected or reserved for mounting stability |
Below is an example of how to control the MY4N relay using an Arduino UNO:
// Define the pin connected to the relay's coil
const int relayPin = 7;
void setup() {
// Set the relay pin as an output
pinMode(relayPin, OUTPUT);
}
void loop() {
// Turn the relay ON
digitalWrite(relayPin, HIGH);
delay(1000); // Keep the relay ON for 1 second
// Turn the relay OFF
digitalWrite(relayPin, LOW);
delay(1000); // Keep the relay OFF for 1 second
}
Note: Use a transistor or relay driver module to interface the Arduino with the MY4N relay, as the Arduino's GPIO pins cannot directly supply enough current to energize the relay coil.
Relay Not Switching
Contacts Sticking
Coil Overheating
Voltage Spikes in Circuit
Relay Buzzing
Q: Can the MY4N relay switch both AC and DC loads?
A: Yes, the MY4N relay can switch both AC and DC loads, provided the voltage and current do not exceed the relay's contact ratings.
Q: What is the purpose of the flyback diode?
A: The flyback diode protects the control circuit from voltage spikes generated when the relay coil is de-energized.
Q: Can I use the MY4N relay for high-frequency switching?
A: The MY4N relay is not designed for high-frequency switching. For such applications, consider using a solid-state relay (SSR).
Q: How do I identify the coil terminals on the relay?
A: Refer to the relay's datasheet or pinout diagram. Typically, the coil terminals are labeled as pins 1 and 2.
Q: Is the MY4N relay suitable for outdoor use?
A: The MY4N relay is not weatherproof. For outdoor use, ensure it is housed in a weatherproof enclosure.