3V / 3.3V 1/2/4/8-Channel Relay Module Why you need this module Control multiple high-power circuits from low-voltage control signals without redesigning your system. The module provides an easy, reliable interface between 3V/3.3V logic and external loads. Dual optocoupler isolation separates control electronics from relay drivers, reducing electrical noise and protecting sensitive controllers. Flexible trigger modes (high and low level) let you connect to a wide range of control sources without extra circuitry. Key benefits and how it solves problems Reliable isolation: Dual optocoupler isolation minimizes interference and risk of damage to your microcontroller or control board. Versatile input: Supports both high-level and low-level triggering so you can drive the relays directly from different logic outputs. Scalable channel counts: Available in 1, 2, 4, and 8 channel options so you can pick the right size for single-switch tasks or multi-relay systems. 3V / 3.3V compatibility: Specifically designed for 3V and 3.3V logic-level systems to ensure reliable operation without level shifting. Important attributes Function: Electromechanical relay switching controlled by logic-level inputs for isolating and switching external circuits. Compatibility: Designed for direct operation with 3V / 3.3V logic-level control signals. Trigger modes: Supports both high-level and low-level trigger inputs. Isolation: Dual optocoupler isolation between control inputs and relay drivers for improved reliability and safety. Channel options: Available in 1, 2, 4, and 8 channel variants; the 8-channel option provides expanded flexibility for multiple outputs. Typical form: Compact relay module format suitable for integration into electronics projects and control panels. Performance and reliability Designed for dependable relay switching in projects that require specific logic-level operation and electrical isolation. Optocoupler isolation helps reduce noise coupling and protects control electronics in electrically noisy environments. Example applications Home automation: Switch lights, fans, or appliances from a 3.3V control system while keeping the control board isolated from mains wiring. IoT and embedded projects: Add multiple relay outputs to a 3.3V microcontroller-based project for controlling external actuators, motors, or power circuits. Test and control benches: Use the 8-channel module for multi-channel testing, relay sequencing, or managing several loads from a single 3.3V control source. What to expect in use Choose the channel count that matches your project needs (1, 2, 4, or 8). Connect 3V/3.3V logic-level control signals directly; select high or low trigger logic as required by your controller. Benefit from optocoupler isolation to protect the control side and improve system stability in electrically noisy environments.