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CAT # MK-2633 (2 Reviews) Write a Review

$21.95 each
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Product Description
Velleman # K2633. Control up to four high-power circuits from a low power drive circuit. Four 3 Amp / 240 Vac, S.P.D.T. relays. Quick and easy to build. LED status indicators. 3" x 1.7." Power supply, 9Vdc, 300mA (not included).

Note: Kits cannot be returned or exchanged once assembly has begun.
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
(This item was manufactured prior to August 31st, 2018)

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Customer Reviews (2 Reviews)

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Reviewer: from UNIVERSITY PK, IL US

I had to replace the transistors with PNP type to get it to work. Relays will trigger when pins 1, 2, 3 or 4 are shorted to ground.

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Reviewer: from Quakertown, PA

Just wanted to know if anyone had any issues with this kit. I ordered two and had problems with BOTH. 2 of the relays were short between C and NO. I also believe there are errors in the directions as neither of my kits functioned properly. I wound up using the remaining relays on a blank board and created my own card.

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