How to Use Signal-Relais, 5 V DC, 3 A, 2 CO: Examples, Pinouts, and Specs

The Signal-Relais AZ832-2C-5DE by Zettler is a compact, high-performance electromagnetic relay designed for low-power signal switching applications. It operates on a 5 V DC coil voltage and features a double changeover (2 CO) contact configuration, making it suitable for a wide range of applications requiring reliable signal control.

• Telecommunications equipment
• Industrial control systems
• Home automation and IoT devices
• Signal switching in measurement and testing equipment
• Low-power switching in audio and video systems

• Manufacturer: Zettler
• Part Number: AZ832-2C-5DE
• Coil Voltage: 5 V DC
• Contact Configuration: 2 CO (Double Changeover)
• Contact Rating: 3 A at 30 V DC or 3 A at 250 V AC
• Coil Resistance: 178 Ω ±10%
• Operate Time: ≤ 6 ms
• Release Time: ≤ 4 ms
• Dielectric Strength: 1000 V AC (coil to contacts)
• Insulation Resistance: ≥ 1000 MΩ at 500 V DC
• Operating Temperature Range: -40°C to +85°C
• Dimensions: 20.2 mm x 10.2 mm x 10.6 mm
• Weight: Approximately 4.5 g

The AZ832-2C-5DE relay has a total of 8 pins. The pinout is as follows:

1. Power the Coil: Connect the coil terminals (pins 1 and 2) to a 5 V DC power source. Ensure the polarity is correct: pin 1 is positive, and pin 2 is negative.
2. Connect the Load:
   • For the first circuit, connect your load to pins 3 (COM1), 4 (NC1), and 5 (NO1).
   • For the second circuit, connect your load to pins 6 (COM2), 7 (NC2), and 8 (NO2).
3. Switching Logic:
   • When the coil is not energized, the common contacts (COM1 and COM2) are connected to the normally closed contacts (NC1 and NC2).
   • When the coil is energized, the common contacts switch to the normally open contacts (NO1 and NO2).

• Current Limiting: Ensure the current through the contacts does not exceed 3 A to prevent damage.
• Flyback Diode: When using the relay with an inductive load, add a flyback diode across the coil terminals to protect the driving circuit from voltage spikes.
• Mounting: Secure the relay on a PCB or socket to ensure stable operation and avoid mechanical stress.
• Isolation: Maintain proper isolation between the coil and contact circuits to prevent interference.

The AZ832-2C-5DE can be controlled using an Arduino UNO. Below is an example circuit and code to toggle the relay:

• Connect pin 1 of the relay to a digital output pin on the Arduino (e.g., pin 7) through a 1 kΩ resistor.
• Connect pin 2 of the relay to the Arduino GND.
• Use an external 5 V DC power supply for the relay coil if the Arduino's 5 V pin cannot provide sufficient current.

// Define the relay pin
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
}

1. Relay Not Switching:

   • Cause: Insufficient voltage or current to the coil.
   • Solution: Verify the power supply provides 5 V DC and sufficient current (at least 28 mA).

2. Contacts Not Conducting Properly:

   • Cause: Excessive load current or damaged contacts.
   • Solution: Ensure the load current does not exceed 3 A. Replace the relay if contacts are damaged.

3. Noise or Chattering:

   • Cause: Unstable power supply or interference.
   • Solution: Use a decoupling capacitor (e.g., 100 µF) across the power supply terminals.

4. Arduino Cannot Drive the Relay:

   • Cause: Insufficient current from the Arduino pin.
   • Solution: Use a transistor (e.g., 2N2222) as a driver circuit to amplify the current.

• Q: Can I use this relay for AC loads?
  A: Yes, the relay supports up to 3 A at 250 V AC. Ensure proper isolation and safety precautions.

• Q: What is the maximum switching frequency?
  A: The relay can handle up to 20 operations per second for signal-level loads.

• Q: Is the relay polarity-sensitive?
  A: Yes, the coil terminals (pins 1 and 2) must be connected with the correct polarity.

• Q: Can I use this relay in high-temperature environments?
  A: Yes, the relay operates reliably within a temperature range of -40°C to +85°C.