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This is a vertical mount for the 12V 8-channel relay boards that are like : https://smile.amazon.com/HiLetgo-Channel-Module-Optocoupler-Trigger/dp/B00LW2GA5Y/ref=sr_1_32?ie=UTF8&qid=1538510391&sr=8-32&keywords=12v+relay+board
or from AliExpress: https://www.aliexpress.com/item/8-channel-relay-module-5V-12V-24V-high-and-low-level-trigger-relay-control-with-optocoupler/32830907128.html?spm=a2g0s.9042311.0.0.173f4c4dRA6hYt
Dimensions for the board are:
module size: 141.5mm 50mm 18.5mm (L W H) with four mounting bolts holes, hole 3.1mm, spacing 136mm * 44.5mm
All holes are M3. The swing arms have slots for zip ties or velcro to provide strain relief.
I designed this for a project that needs 8 of these boards (a clickety clackety wonderland!) and I wanted to minimize their footprint so a vertical solution that allowed field replacement was desireable.
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