5V Relay Module for ARM Indicator 4 Channel Relay with Optocoupler

4-Channel 5 V Relay Module with Optocoupler

This unbranded 4-channel relay board provides four independently controlled relay outputs for low-voltage controller projects. It uses 5 V Songle SRD-05VDC-SL-C relays and has optocoupler input stages, status LEDs and a jumper for selecting the trigger level.

Board Features

• Four independent 5 V relay channels.
• Songle SRD-05VDC-SL-C relays, as marked on the installed components.
• Optocoupler input stages and channel status LEDs.
• High/low trigger selection jumper.
• Input header marked GND, IN1, IN2, IN3, IN4 and VCC.
• Screw terminals for each relay's normally open, normally closed and common contacts.

Relay Contact Marking

• The installed relay markings list 10 A at 250 VAC, 10 A at 125 VAC and 10 A at 30 VDC for resistive-load contact ratings.
• Contact ratings are component ratings, not a guarantee for an assembled system or every load type.
• Inductive, capacitive, motor and inrush loads require derating and suitable suppression/protection components.

Connection Notes

• Power the board from a regulated 5 V DC supply connected to VCC and GND.
• Connect each control signal to the corresponding IN terminal, then set the high/low trigger jumper to suit the controller logic.
• Before connecting a load, identify the required NO, NC and COM terminal behavior for that channel.
• Confirm the controller ground, signal voltage and relay trigger behavior on a low-voltage test setup before final installation.

Safety

• This is a bare electronics module, not an enclosed or certified mains-control product.
• For AC mains or high-energy loads, use a suitable enclosure, fuse/overcurrent protection, strain relief, clearance and wiring practices. Installation should be performed by a qualified person where required.
• Disconnect all power before wiring, changing jumpers or servicing the board.

In the Box

1 x 4-channel 5 V relay module.