Description
Product Overview
The 1 Channel Relay Module without Optocoupler is a simple, cost-effective solution for controlling high-power devices from low-voltage microcontrollers such as Arduino, ESP32, Raspberry Pi, PIC, AVR, and ARM . This module acts as an electrically operated switch that allows your low-voltage control signal (3.3V–5V) to safely switch high-voltage loads up to 250V AC or 30V DC at 10A .
Unlike optically isolated relay modules, this version uses a direct transistor drive circuit (typically an 8550 or 8050 transistor) to activate the relay coil . This design offers a lower cost and simpler circuit, making it ideal for hobbyist projects, educational use, and applications where isolation is not critical.
The module provides SPDT (Single Pole Double Throw) relay contacts, giving you access to both Normally Open (NO) and Normally Closed (NC) terminals. This allows you to configure your load to be either OFF by default (using NO) or ON by default (using NC) . Whether you’re controlling lights, fans, pumps, motors, or other household appliances, this relay module provides a reliable interface between your digital electronics and the physical world .
Key Features
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Direct Transistor Drive: Uses 8550 or 8050 transistor to drive the relay coil, eliminating the need for optocoupler isolation
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High Load Capacity: Relay contacts rated for 10A at 250V AC or 10A at 30V DC, suitable for controlling lights, fans, pumps, and small motors
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Active Low Control: Input is active LOW—relay activates when the control pin is pulled LOW (0V) and deactivates when pulled HIGH (5V)
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SPDT Contact Configuration: Provides Common (COM), Normally Open (NO), and Normally Closed (NC) terminals for flexible wiring options
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Status Indicator LEDs: Includes a power LED (green) and a relay status LED (red) for visual confirmation of operation
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Wide Operating Voltage: Accepts 3.75V to 6V DC power supply, with optimal operation at 5V
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Low Quiescent Current: Consumes only 2mA when idle, and approximately 70mA when the relay is active
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Standard Interface: 3-pin header (VCC, GND, IN) with 2.54mm pitch for easy connection to breadboards and microcontrollers
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Operating Voltage | 5V DC (3.75V – 6V range) |
| Quiescent Current | 2mA |
| Active Current | ~70mA |
| Control Signal | Active LOW (0V = ON, 5V = OFF) |
| Relay Contact Rating (AC) | 250V AC @ 10A |
| Relay Contact Rating (DC) | 30V DC @ 10A |
| Contact Configuration | SPDT (COM, NO, NC) |
| Drive Transistor | 8550 or 8050 |
| Operating Temperature | -40°C to +85°C |
| Dimensions | Approx. 50mm × 26mm × 18mm |
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