JESSINIE 1 Channel DC 3V/3.3V Power Relay Module User Manual

1. Introduction

This manual provides essential information for the safe and effective use of the JESSINIE 1 Channel DC 3V/3.3V Power Relay Module. This module is designed for control applications requiring electrical isolation between the control circuit and the load circuit. Please read this manual thoroughly before installation and operation.

2. Product Features

• Indicator with output signal for visual status feedback.
• Signal input port compatible with single-chip microcomputer IO ports, driven by high-level signals.
• Dual power supply selection design for enhanced anti-interference and reliable photoelectric isolation protection.
• Onboard 3V, 10A/250VAC; 10A/30V DC relay, rated for 100,000 continuous closures, featuring diode protection for short response time.
• External connections utilize rotary crimping terminals for secure wiring.
• Includes fixed mounting holes for easy installation.

3. Specifications

4. Setup and Connections

The relay module features clearly labeled terminals for easy connection. Ensure all power is disconnected before making any connections.

4.1 Terminal Overview

Refer to the image below for terminal identification:

• VCC: Power supply input for the relay coil (3V/3.3V DC).
• IN: Signal input pin to control the relay (connect to microcontroller IO).
• GND: Ground connection for the relay coil power supply.
• NO (Normally Open): This contact is open when the relay is de-energized and closes when energized.
• COM (Common): The common contact for the load circuit.
• NC (Normally Closed): This contact is closed when the relay is de-energized and opens when energized.

4.2 Wiring Instructions

1. Power Connection: Connect a 3V or 3.3V DC power source to the VCC and GND terminals. Ensure correct polarity.
2. Control Signal Connection: Connect the IN terminal to a digital output pin of your microcontroller (e.g., Raspberry Pi, ESP32). The relay is activated by a high-level signal on this pin.
3. Load Connection: Connect your load (e.g., light, motor) to the COM terminal and either the NO or NC terminal, depending on your application's requirements. For most switching applications, the load is connected between COM and NO.

The module features rotary crimping terminals for secure wire connections. Use appropriate wire gauges for your application.

4.3 Dimensions

5. Operating Instructions

The JESSINIE 1 Channel DC 3V/3.3V Power Relay Module operates by receiving a high-level signal on its IN pin, which energizes the relay coil and changes the state of its contacts.

5.1 Basic Operation

• When a high-level signal (typically 3V or 3.3V, matching VCC) is applied to the IN terminal, the relay coil energizes.
• Upon energization, the NO (Normally Open) contact closes, connecting to COM. The NC (Normally Closed) contact opens, disconnecting from COM.
• The onboard indicator light will illuminate when the relay is energized.
• When the IN terminal receives a low-level signal (0V) or is disconnected, the relay coil de-energizes.
• Upon de-energization, the NO contact opens, and the NC contact closes.
• The indicator light will turn off when the relay is de-energized.

5.2 Operational Demonstration

The following video demonstrates the basic operation and connection of the 1 Channel DC 3V/3.3V Power Relay Module:

6. Maintenance

The JESSINIE relay module is designed for durability and reliability. Minimal maintenance is required.

• Keep Dry: Protect the module from moisture and extreme temperatures.
• Cleanliness: Periodically inspect the module for dust or debris. Use a soft, dry brush or compressed air for cleaning. Do not use liquids.
• Connection Integrity: Ensure all wire connections to the rotary crimping terminals remain secure. Loose connections can lead to intermittent operation or damage.
• Visual Inspection: Regularly check for any signs of physical damage, discoloration, or burnt components.

7. Troubleshooting

If you encounter issues with your JESSINIE 1 Channel DC 3V/3.3V Power Relay Module, refer to the following troubleshooting steps:

7.1 Relay Not Activating

• Check Power Supply: Verify that the VCC and GND terminals are receiving the correct 3V/3.3V DC power and that the polarity is correct.
• Verify Signal Input: Ensure the IN terminal is receiving a stable high-level signal from your microcontroller. Use a multimeter to confirm the voltage level.
• Inspect Connections: Confirm all wires are securely connected to the rotary crimping terminals and that there are no loose or broken connections.
• LED Series Resistance (Important for 3.3V Microcontrollers): Some relay modules may have an indicator LED in series with the relay coil's power path. If your 3.3V microcontroller's GPIO pin cannot reliably activate the relay, it might be due to a voltage drop across this LED. In such cases, ensure the VCC for the relay module is sufficiently robust, or consider using an external transistor to drive the IN pin if the microcontroller's output current is insufficient.

7.2 Indicator Light Not Functioning

• Check Relay Activation: The indicator light is directly tied to the relay's activation. If the relay is not activating (see above), the light will not turn on.
• Inspect for Damage: Visually check the LED for any signs of damage.

7.3 Load Not Switching

• Confirm Relay Activation: Ensure the relay is clicking and the indicator light is on when the IN signal is high.
• Check Load Wiring: Verify that the load is correctly wired between the COM and the desired NO/NC terminal.
• Load Power: Ensure the load itself is receiving power and is functioning correctly independently of the relay.
• Contact Rating: Confirm that the load's voltage and current requirements do not exceed the relay's maximum switching ratings (10A, 250VAC/30VDC).

8. Safety Information

When working with electrical components, always prioritize safety:

• Disconnect Power: Always disconnect all power sources before making or changing any electrical connections.
• Voltage Ratings: Do not exceed the maximum voltage and current ratings of the relay module.
• Proper Insulation: Ensure all exposed wires and connections are properly insulated to prevent short circuits and electrical shock.
• Qualified Personnel: If you are unsure about any aspect of installation or wiring, consult with a qualified electrician or electronics professional.
• Environment: Use the module in a dry, non-condensing environment, away from flammable materials.

9. Warranty and Support

For warranty information or technical support regarding your JESSINIE 1 Channel DC 3V/3.3V Power Relay Module, please contact the manufacturer or your point of purchase. Keep your purchase receipt for warranty claims.