Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the Generic SRD-05VDC-SL-C 5V DC 10A One-Channel Power Relay Module. Please read this manual thoroughly before using the product to ensure safe and efficient operation.
Product Overview
The SRD-05VDC-SL-C is a compact, single-channel power relay module designed for various control applications, including SCM (Single-Chip Microcomputer) projects and home appliance control. It features a 5V DC coil and contacts rated for up to 10A at 250VAC or 28VDC.
Key features include:
- Coil Voltage: 5V DC
- Contact Rating: 10A 250VAC / 10A 28VDC
- Contact Form: 1a, 1b, 1c (SPDT - Single Pole Double Throw)
- Mounting Type: PCB (Printed Circuit Board)
- Insulation Resistance: >=100M Ohms
- Electrical Life: 100,000 operations
- Mechanical Life: 10,000,000 operations
Figure 1: Top view of the SRD-05VDC-SL-C relay module, showing the model number and contact ratings printed on its blue casing.
Safety Information
Always observe the following safety precautions to prevent injury or damage to the product:
- Ensure power is disconnected before installation or wiring.
- Do not exceed the specified voltage and current ratings for the coil and contacts.
- Handle with care to avoid damaging the pins or internal components.
- Installation should be performed by qualified personnel if you are unsure about electrical wiring.
- Avoid exposure to extreme temperatures, moisture, or corrosive environments.
Setup and Wiring
The SRD-05VDC-SL-C relay module is designed for PCB mounting. Proper wiring is crucial for its functionality.
Figure 2: Bottom view of the relay module, illustrating the arrangement of the five pins for PCB mounting.
Pin Configuration:
The relay typically has 5 pins: two for the coil and three for the contacts (Common, Normally Open, Normally Closed).
- Coil Pins: These pins connect to the 5V DC control signal. When 5V DC is applied across these pins, the coil energizes, changing the state of the contacts.
- Common (COM) Pin: This is the central contact that switches between NO and NC.
- Normally Open (NO) Pin: This contact is open (no connection) when the coil is de-energized and closes (connects to COM) when the coil is energized.
- Normally Closed (NC) Pin: This contact is closed (connected to COM) when the coil is de-energized and opens (disconnects from COM) when the coil is energized.
Installation Steps:
- Identify Pins: Carefully identify the coil pins and the contact pins (COM, NO, NC) on your relay module. Refer to the markings on the relay or its datasheet if available.
- Mount to PCB: Solder the relay's pins onto the designated pads on your Printed Circuit Board. Ensure correct orientation.
- Connect Control Circuit: Connect the coil pins to your 5V DC control circuit (e.g., a microcontroller output). Ensure the polarity is correct if specified.
- Connect Load Circuit: Connect the load you wish to control to the appropriate contact pins. For example, to switch a device ON when the relay is activated, connect one side of the load to the COM pin and the other side to the NO pin. The power source for the load connects to the remaining side of the load.
- Verify Connections: Double-check all wiring for correctness and secure connections before applying power.
Figure 3: An angled view of the relay, providing a clearer perspective of its compact form factor and pin layout from the side.
Operating Instructions
The relay operates by energizing its coil, which creates a magnetic field that moves the armature, thereby changing the state of the contacts.
- De-energized State: When no voltage is applied to the coil pins, the relay is in its default state. The Common (COM) pin is connected to the Normally Closed (NC) pin, and disconnected from the Normally Open (NO) pin.
- Energized State: When 5V DC is applied across the coil pins, the coil energizes. This causes the Common (COM) pin to disconnect from the Normally Closed (NC) pin and connect to the Normally Open (NO) pin.
- Control Signal: Use a digital output pin from your microcontroller (e.g., Arduino, Raspberry Pi) to provide the 5V DC signal to the relay coil. A high signal (5V) will energize the coil, and a low signal (0V) will de-energize it.
Figure 4: A different angled perspective of the relay, highlighting the overall dimensions and the robust construction of the casing.
Maintenance
The SRD-05VDC-SL-C relay module is generally maintenance-free. However, consider the following to ensure its longevity:
- Environmental Conditions: Operate the relay within its specified ambient temperature range (-25°C to +70°C) and avoid excessive humidity or dust.
- Cleanliness: Keep the module free from dust and debris, which can interfere with contact operation or heat dissipation.
- Inspection: Periodically inspect the solder joints and wiring for any signs of corrosion or loosening, especially in high-vibration environments.
Figure 5: Side view of the relay module, showing its height and the compact design suitable for various PCB layouts.
Troubleshooting
If you encounter issues with your relay module, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Relay does not click or switch | Incorrect coil voltage No power to coil Damaged coil | Verify 5V DC is applied to coil pins. Check wiring for breaks or loose connections. Test coil resistance with a multimeter; replace if open circuit. |
| Load does not turn ON/OFF | Incorrect contact wiring Load power issue Damaged contacts | Ensure load is connected to COM and NO/NC correctly. Check power supply to the load. Test continuity across contacts; replace if contacts are stuck or open. |
| Relay buzzes or chatters | Insufficient coil voltage AC ripple on DC supply | Ensure stable 5V DC supply to the coil. Use a regulated DC power supply or add a capacitor to smooth the supply. |
Figure 6: Another angled view, providing a comprehensive look at the relay's exterior from a different side, useful for visual inspection.
Specifications
Detailed technical specifications for the SRD-05VDC-SL-C relay module:
| Parameter | Value |
|---|---|
| Model | SRD-05VDC-SL-C |
| Coil Rated Voltage | 5V DC |
| Coil Power | 0.36W - 0.45W |
| Coil Pick-up Voltage | <=75% of Rated Voltage |
| Coil Drop-out Voltage | >=10% of Rated Voltage |
| Contact Form | 1a, 1b, 1c (SPDT) |
| Rated Load | 10A 250VAC / 10A 28VDC |
| Contact Resistance | <=100m Ohms |
| Electrical Life | 100,000 operations |
| Mechanical Life | 10,000,000 operations |
| Insulation Resistance | >=100M Ohms |
| Dielectric Strength (Coil to Contacts) | 1500VAC/min |
| Dielectric Strength (Contacts to Contacts) | 1000VAC/min |
| Mounting Form | PCB Type (Through Hole) |
| Ambient Temperature | -25°C to +70°C |
| Dimensions (approx.) | 1.5cm x 1.9cm x 2cm |
Warranty and Support
This product is provided by Generic. For any technical support, warranty claims, or inquiries regarding the SRD-05VDC-SL-C relay module, please contact the seller or manufacturer directly through your purchase platform. Please retain your proof of purchase for any warranty-related services.
