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Quad triac switch card

Velleman K2634: Quad Triac Switch Card

Velleman K2634

The Velleman K2634 Switch Card Kit


Using relays to switch AC voltages through an electronic control is common practice. Relays are simple to use but they are slow and have a shorter lifespan. Replacing relays with a triac, such as the K2643, can solve this issue as triacs are electrically isolated by optocouplers and thus less sensitive to interference. The K2643 is controlled by current rather than voltage and can be used with a control current between 10 and 20mA DC.


The quad triac card has four outputs and four control LEDs. With less interference sensitivity, the triac can be mounted near the load and further from the control curcuit. Connect this card to Velleman kits such as the K8000, K8050, K8023, K8055, and any others with an an open collector output and improve the longevity of your circuit.



  • Triac outputs: 4 triac outputs of 1.5A (uncooled, 4A cooled)
  • Power supply: 9V DC, 200mA
  • PCB dimensions: 3.1 x 3.5"

Additional Information

Difficulty Level 2


Parts list
English assembly instructions through illustrations, pictures, etc.

Assembly instructions
Written multilingual manual explaining how to build the kit

Info Sheets

Resistor colour code

Overview of Velleman modules that are equal to D.I.Y Kits
This sheet is useful when you want to know which modules you could find in the do-it-yourself range of Velleman Kits and minikits.

 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product