Camdenboss din rail vented module box kits camdenboss cnmb3vkit the camdenboss din rail vented module box kit m3 are the perfect enclosures for a wide range of electrical and electronic projects available in various sizes these enclosures fit 35mm din rail or direct surface mount the kit components are also available separately in various options so that a completely custom designed box may be made upthe kits consist of base top panel terminal clips for rail or wall mounting each k