How to Use SSR - 40da pequeño: Examples, Pinouts, and Specs

The SSR - 40DA Pequeño is a compact solid-state relay (SSR) designed for switching electrical loads without the use of mechanical components. Unlike traditional electromechanical relays, the SSR - 40DA offers faster operation, silent switching, and a significantly longer lifespan due to the absence of moving parts. This makes it ideal for applications requiring high reliability and frequent switching.

• Industrial automation systems
• Temperature control systems (e.g., heaters, ovens)
• Motor control and lighting systems
• Home automation projects
• Applications requiring noise-free and spark-free switching

• Input Voltage (Control Side): 3-32V DC
• Output Voltage (Load Side): 24-380V AC
• Maximum Load Current: 40A
• Trigger Current: ≤7.5mA
• Switching Speed: ≤10ms
• Dielectric Strength: ≥2500V AC
• Insulation Resistance: ≥1000MΩ at 500V DC
• Operating Temperature Range: -30°C to +80°C
• Mounting Type: Panel mount
• Dimensions: 58mm x 45mm x 23mm

The SSR - 40DA Pequeño has four terminals, divided into two sections: the input (control) side and the output (load) side.

1. Connect the Control Side:

   • Connect the positive terminal of the DC control signal (e.g., from a microcontroller or power supply) to the + pin.
   • Connect the negative terminal of the DC control signal to the - pin.
   • Ensure the control voltage is within the range of 3-32V DC.

2. Connect the Load Side:

   • Connect one terminal of the AC load to the AC Load (1) pin.
   • Connect the other terminal of the AC load to the AC Load (2) pin.
   • Ensure the load voltage and current do not exceed the rated 24-380V AC and 40A, respectively.

3. Power the Circuit:

   • When the control signal is applied, the SSR will switch the AC load on.
   • When the control signal is removed, the SSR will switch the AC load off.

• Heat Dissipation: The SSR - 40DA can generate heat during operation, especially at high loads. Use a heatsink or mount the relay on a metal surface to improve heat dissipation.
• Load Type: This SSR is designed for resistive loads (e.g., heaters, incandescent lamps). For inductive loads (e.g., motors), use a snubber circuit to protect the relay.
• Isolation: Ensure proper electrical isolation between the control and load sides to prevent damage to sensitive components.
• Wiring: Use appropriately rated wires and connectors for the load current to avoid overheating or fire hazards.

Below is an example of how to control the SSR - 40DA using an Arduino UNO to switch an AC load.

• Connect the + pin of the SSR to an Arduino digital output pin (e.g., pin 9).
• Connect the - pin of the SSR to the Arduino GND.
• Connect the AC load to the AC Load (1) and AC Load (2) pins of the SSR.

// Define the pin connected to the SSR control input
const int ssrPin = 9;

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

void loop() {
  // Turn the SSR (and the connected AC load) ON
  digitalWrite(ssrPin, HIGH);
  delay(5000); // Keep the load ON for 5 seconds

  // Turn the SSR (and the connected AC load) OFF
  digitalWrite(ssrPin, LOW);
  delay(5000); // Keep the load OFF for 5 seconds
}

• Ensure the AC load is properly connected and rated for the SSR.
• Never touch the AC load terminals while the circuit is powered.

1. The SSR does not switch the load:

   • Verify that the control voltage is within the specified range (3-32V DC).
   • Check the wiring on both the control and load sides for loose or incorrect connections.
   • Ensure the load voltage and current are within the SSR's rated limits.

2. The SSR overheats:

   • Ensure proper heat dissipation by using a heatsink or mounting the SSR on a metal surface.
   • Check that the load current does not exceed 40A.

3. The load flickers or does not stay on:

   • Verify the stability of the control signal voltage.
   • For inductive loads, use a snubber circuit to suppress voltage spikes.

4. The SSR is damaged or not functioning:

   • Check for short circuits or overvoltage conditions on the load side.
   • Ensure the SSR is not exposed to temperatures beyond its operating range.

Q: Can I use the SSR - 40DA Pequeño with a DC load?
A: No, this SSR is designed specifically for AC loads. For DC loads, use a DC-specific SSR.

Q: Is the SSR - 40DA optically isolated?
A: Yes, the control and load sides are optically isolated to protect the control circuit from high voltages.

Q: Can I use the SSR with an inductive load like a motor?
A: Yes, but you must use a snubber circuit to protect the SSR from voltage spikes caused by the inductive load.

Q: What happens if I exceed the rated current or voltage?
A: Exceeding the rated limits can damage the SSR permanently. Always ensure the load is within the specified range.

Q: Does the SSR make any noise during operation?
A: No, the SSR operates silently as it has no moving parts.