The 12V 4-Channel Relay Module is a high-quality, reliable solution for controlling high-voltage AC or DC loads with low-power control signals from microcontrollers like Arduino, ESP32, Raspberry Pi, and others. Featuring optocoupler isolation for improved safety and diode protection for back EMF, this module ensures long-term durability and stability in automation and DIY applications.

Key Features:

• 4 Independent Relay Channels – Each relay can be triggered individually
• Optocoupler Isolation – Electrical isolation protects your microcontroller from voltage spikes
• High Current Capacity – Handles up to 10A at 250VAC or 30VDC
• Active Low Trigger – Compatible with 3.3V and 5V logic levels
• Coupling Protection Diodes – Prevent back-EMF damage during relay switching
• Status LEDs – Onboard indicators show relay activation status

Specifications:

• Operating Voltage: 12VDC
• Trigger Voltage: 5V (active LOW)
• Relay Type: SPDT (Single Pole Double Throw)
• Relay Channels: 4
• Max Switching Voltage: 250VAC / 30VDC
• Max Switching Current: 10A
• Isolation: Optocoupler (photocoupler)
• Protection: Diode suppression for inductive loads
• Indicator LEDs: 1 per channel
• Mounting Holes: Yes (for panel or enclosure mounting)