The RK series terminal block housing has a high protection rating of IP 54 to IP 66. Standard equipment includes an IP 54 mounting socket and a 35 x 7.5 mm mounting rail for individual configuration. It features wall mounting options in the base of the box (alternatively below the cover screws) and metric pre-formed knockouts. No additional drilling or milling is required - simply punch out the openings with a screwdriver and install the included IP 54 mounting sockets. The cover made of impact-resistant polystyrene is designed to be sealable as standard. To achieve a higher protection rating (up to IP 66), it is sufficient to replace the mounting sockets with cable glands. The housing material is halogen-free and has the UL "Yellow Card.".