4QD - Reducing electrical interference is important for a number of reasons. It stops your system from causing interference with others, but more importantly it prevents unwanted electrical signals getting into the more sensitive parts of a controller [the mosfet gates] and causing destructive latch-up. This page in our knowledgebase gives more detail, or have a look at this short video…
 
https://www.4qd.co.uk/product/interference-suppression-pack/