DIN rail is very popular. I even manufacture a niche product in a DIN rail case because most of the users will be placing it in a control cabinet with similar c

DIN rail is very popular. I even manufacture a niche product in a DIN rail case because most of the users will be placing it in a control cabinet with similar components. The main savings are in labor costs avoided drilling mounting holes and ease of replacement. The standard sizes also make it easy to fit various components in a limited space.