Really confused by the VCC in, is it 5V as in the description or 12V? I am applying 5V DC on VCC and 3V signal without a click on the relays.

The relay attached to your question requires 12vdc input to the coil. They are available with 5vdc coil input voltage. Hope this helps.

Is there an on-board way to make both relays work simultaneously, aside from a jumper wire between the two IN ports?

I’m not sure I really follow the purpose of your “ Without a Jumper “ . To make both work together they need to be linked OR the device you are triggering from needs to send 2 independent triggers. If the objective is just to avoid a physical jumper then the other option is a solder link on the underside.

4pcs DC 5V Relay Module 2 Channel Relay Board with Optocoupler Support High or Low Level Trigger

Product ID: 361376111

Details

Connector Type
Through Hole
Contact Material
Nickel
Contact Type
Normally Open
Current Rating
10 Amps
Mounting Type
通孔安装

⚡5V Power Supply

🔌AC 250V/10A Load

🔒Opto-Isolated Trigger

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₨7466

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Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Connector Type
Through Hole
Contact Material
Nickel
Contact Type
Normally Open

Description

🔧 Power Your Projects with Precision!

SAFETY FIRST - Fault-tolerant design ensures peace of mind.
STABLE PERFORMANCE - Optical isolation for consistent triggering.
HIGH CURRENT HANDLING - Power up to 10A for robust applications.
VERSATILE CONNECTIVITY - Easily integrates with various microcontrollers.
UNLEASH YOUR AUTOMATION - Transform your projects with reliable control!

The AEDIKO 4pcs DC 5V Relay Module is a versatile 2-channel relay board designed for high-performance automation. With a maximum load of AC 250V/10A and DC 30V/10A, it features opto-isolated digital inputs for reliable control. Its fault-tolerant design ensures that even if the control line breaks, the relay remains inactive, making it a safe choice for various applications. Equipped with a standard interface, it easily connects to microcontrollers, making it ideal for DIY enthusiasts and professionals alike.

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