Suitable for installations that require functional integrity in the event of a fire. The box includes a ceramic terminal block with functional integrity, suitable for 5 conductors with a cross-section of 1.5 to 6 mm². The box is secured to the concrete with the included anchor. The terminal block allows for the connection of devices (without functional integrity) on a branch circuit. A thermal fuse disconnects the branch circuit when the permissible temperature is exceeded, ensuring the functionality of the main circuit is maintained (cut-off temperature 150 °C, maximum current load 10 A). The soft sealing membranes enable easy cable entry while maintaining protection class IP 66. The cover is secured with the supplied stainless steel screws.