4 Relay Module 30A 250V - Optoisolated - 5V DC

Overview

This 4 Relay Module 30A is a high-current, opto-isolated relay board intended for reliable switching of AC and DC loads in control, automation, and electronics projects. The module provides four independent relay channels powered from a 5 V DC supply and is suitable for use with microcontrollers, PLC outputs, and other digital control systems.

Each relay channel is electrically isolated from the control inputs via optocouplers, reducing the risk of noise coupling and improving protection of the control electronics when switching high-power loads.

Selectable trigger logic allows the relays to be activated using either high-level or low-level control signals, making the board compatible with a wide range of logic standards and output types.

Key Features of the 4 Relay Module 30A

• Four independent mechanical relay channels
• Relay contacts rated up to 30 A at 250 VAC (resistive load)
• Opto-isolated control inputs for galvanic separation
• 5 V DC supply for relay coils and logic
• Selectable high-level or low-level trigger operation
• Screw terminals for secure high-current wiring
• LED indicators showing relay activation state

Electrical and Usage Notes

• Intended for switching resistive and moderate inductive loads
• Not suitable for fast switching or PWM operation
• External fusing is recommended for high-current applications
• Appropriate wire gauge and terminal torque must be used
• Continuous operation near maximum ratings requires conservative thermal design

Typical Applications for the 4 Relay Module 30A

• Industrial and workshop automation
• PLC output expansion
• Motor, pump, and solenoid control
• Heater and lighting switching
• Power distribution and load isolation
• Test benches and lab equipment

Specifications