How to Use SSR-10A: Examples, Pinouts, and Specs

The SSR-10A is a Solid State Relay (SSR) designed for high-speed, silent switching of AC loads without the mechanical wear and tear associated with traditional electromechanical relays. It is ideal for a wide range of applications including industrial automation, home automation, and temperature control systems.

• Controlling high-power devices such as heaters, motors, and lights.
• PID temperature control in soldering stations, ovens, and incubators.
• Home automation for controlling appliances remotely.
• Switching of resistive and inductive loads in industrial automation.

• Control Voltage Range: 3-32V DC
• Load Voltage Range: 24-380V AC
• Maximum Current Rating: 10A
• Isolation: Opto-isolation between input and output
• Zero Cross: Yes, for reduced electrical noise
• Response Time: Fast on/off time, typically less than 10ms

1. Control Side Connection:

   • Connect the positive terminal of the DC control signal to pin 1.
   • Connect the negative terminal of the DC control signal to pin 2.

2. Load Side Connection:

   • Connect one terminal of the AC load to pin 3.
   • Connect the other terminal of the AC load to pin 4.

3. Powering the SSR:

   • Apply a DC voltage within the specified range (3-32V DC) to the control side to switch the relay on.
   • Remove the control voltage to switch the relay off.

• Ensure the load does not exceed the maximum current rating of 10A.
• Use proper heat sinking if the relay is to be used near its maximum rating.
• Consider using a snubber circuit for inductive loads to protect against voltage spikes.
• Always ensure proper isolation between the control and load circuits for safety.

• SSR does not switch on: Check if the control voltage is within the specified range and properly connected.
• SSR overheats: Ensure the current through the SSR does not exceed 10A and that adequate heat sinking is in place.
• Load does not turn off: Verify that the control voltage is completely removed and that there are no shorts on the load side.

• Double-check wiring connections according to the pin configuration.
• Measure the control voltage to ensure it falls within the specified range.
• For inductive loads, consider using a snubber circuit to manage voltage spikes.

Q: Can the SSR-10A be used to switch DC loads? A: No, the SSR-10A is designed for AC loads only.

Q: Is there a need for a heatsink? A: For continuous operation near the 10A limit, a heatsink is recommended to dissipate heat.

Q: How do I know if the SSR is on? A: Some SSRs have an LED indicator. If not, measuring the voltage across the load terminals when the control voltage is applied can confirm operation.

// Example code to control an SSR-10A with an Arduino UNO

const int ssrPin = 7; // Connect the control voltage (+) to Digital Pin 7

void setup() {
  pinMode(ssrPin, OUTPUT); // Set the SSR pin as an output
}

void loop() {
  digitalWrite(ssrPin, HIGH); // Turn on the SSR (apply control voltage)
  delay(5000);                // Keep the SSR on for 5 seconds
  digitalWrite(ssrPin, LOW);  // Turn off the SSR (remove control voltage)
  delay(5000);                // Keep the SSR off for 5 seconds
}

Note: Ensure that the control voltage from the Arduino matches the SSR's requirements. Use a suitable driver if necessary.