# 1-channel relay module, 3.3V, Low Level

> 1-channel relay module with 3.3V DC input voltage, Low Level triggering (relay activates when the signal is pulled to GND). Compatible with ESP32, ESP8266 boards and PIC, AVR, DSP, ARM MCUs. Includes status and power LEDs, screw terminals on the relay (COM, NC, NO) and 2.54mm pins for power/signal. Dimensions: 44 x 27mm.

- Page: https://sigmanortec.ro/en/1-channel-relay-module-33v-low-level
- Price: 11.48 RON
- Availability: In stock; 1-2 zile
- Reference: 9805 · EAN: 5942575544822
- Category: Electronic components > Relays
- Specifications: Output Type Voltage: Closed-Open Contact; Input Voltage: 3.3 V; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Package (shipping data): 0.014 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:33 (Europe/Bucharest)

## Description

Allows simple switching of a device or electrical circuit in microcontrollers at 3.3V, with Low Level trigger, the relay activates when the input is at GND. Compatible with ESP32, ESP8266 boards and MCU PIC, AVR, DSP, ARM, includes LEDs for status and power, and connection to the load is made quickly via COM, NC, NO screw terminals.
Single-channel relay module, operated at 3.3V, compatible with 3.3V development boards and with a wide range of microcontrollers, such as PIC, AVR, DSP and ARM MCU. This module uses low level signals of 3.3V and is of the Low Level type, that is, the relay is energized when the signal pin is set to GND.
This module features a single relay channel for controlling electrical devices, allowing you to switch a single device or circuit with ease.
It accepts low-level trigger signals of 3.3V, making it suitable for microcontrollers that operate at this voltage. This feature ensures compatibility and interconnectivity with a wide range of MCUs such as ESP32 and ESP8266 boards.
The relay is equipped with LED indicators to allow you to monitor the status of the relay and its power supply in real time.
On the output is the 3-pin screw connector, COM, NC and NO.
Specifications:
Relay Channels: 1
Relay actuation: Low Level (3.3V)
Supply Voltage: 3.3V
Logic voltage: 3.3V
Indicator LEDs: Yes
MCU compatibility: PIC, AVR, DSP, ARM
Interface: Screw terminals on relay, 2.54mm pins on power and signal
Dimensions mm: 44 x 27mm