2-Channel Relay Module without light coupling with LED 3.3V

Description

Description

The 2-Channel Relay Module without Optocoupler with LED 3.3V is a cost-effective, compact dual-relay switching solution designed for low-voltage control applications where optical isolation is not required. Operating on a 3.3V DC supply—ideal for Raspberry Pi, ESP32, ESP8266, STM32, and other 3.3V logic microcontrollers—this module allows you to independently control two high-power AC or DC loads using simple logic signals from your development board.

Unlike optocoupler-isolated relay modules, this version features a direct transistor-driven circuit design. This eliminates the optocoupler components, resulting in a lower-cost module that is perfectly suitable for non-critical applications, educational projects, and prototyping environments where electrical isolation between the control side and load side is not a primary safety concern. The module retains essential features including dual LED indicators for each channel to show relay activation status, and a power indicator LED for visual confirmation of module operation.

Each of the two independent channels features a Single-Pole Double-Throw (SPDT) relay rated for 10A at 250V AC or 10A at 30V DC, making it capable of controlling a wide range of devices including lights, fans, pumps, solenoids, motors, and household appliances. The module includes screw terminal blocks for reliable load connections and a 4-pin male header (2.54mm pitch) for easy connection to your microcontroller.

The module typically offers jumper-selectable high-level or low-level trigger modes, allowing you to configure the activation behavior without modifying your code. This flexibility makes it compatible with both active-high and active-low control systems.

Note on Design Difference: Unlike optically isolated relay modules, this version does not provide galvanic isolation between the low-voltage control circuit and the high-voltage load circuit. The control ground (GND) and load circuit ground are electrically connected through the transistor driver stage. For applications requiring complete electrical isolation (e.g., controlling household AC mains from sensitive electronics), please consider our optically isolated relay module series. This module is best suited for low-voltage DC load control, educational use, and non-critical switching applications.

Whether you need to control LED lighting strips, automate a small greenhouse, manage 12V pumps, or create a simple home automation prototype, this 2-channel 3.3V relay module delivers reliable, budget-friendly switching performance in a compact package.

Key Features

• 3.3V DC Operation – Specifically designed for 3.3V logic microcontrollers including Raspberry Pi, ESP32, ESP8266, STM32, and others .

• Dual Independent Channels – Two SPDT relays allow simultaneous control of two separate loads with individual trigger inputs .

• Direct Transistor Driver – No optocoupler isolation; lower cost design suitable for non-critical applications and low-voltage DC loads.

• Configurable Trigger Logic – Jumper-selectable High-Level Trigger (active HIGH) or Low-Level Trigger (active LOW) operation .

• 10A High-Current Relays – Each relay rated for 10A at 250V AC or 10A at 30V DC .

• SPDT Contact Configuration – Each relay provides Normally Open (NO), Normally Closed (NC), and Common (COM) terminals for flexible wiring .

• LED Status Indicators – Individual red LEDs illuminate when each relay is activated; green power LED shows module status .

• Wide Compatibility – Works directly with 3.3V logic level microcontrollers without level shifters .

• Screw Terminal Connections – Heavy-duty screw terminal blocks for reliable load wiring and easy installation.

• Compact Form Factor – Small footprint (approx. 50mm x 40mm x 18mm) with mounting holes for secure installation .

Technical Parameters