The boxes have a knock-out FL13 on the upper and lower sides. Type U GBL is a plastic encapsulation formed as a bag, but which is also suited for wall mounting and which can be mounted in a steel box of. Terminal boxes has plenty of connection space. construction sites, light industry, events, etc. Category A earth leakage circuit breaker (40 A/30 mA) at all sockets. All sockets. Our flexible distribution boxes enable reliable, decentralised signal transmission and power transmission up to protection class IP67 – wherever passive distribution boxes are required. High-quality materials and robust product designs ensure a reliable connection, signal transmission and power. Here, decentralized electrical installation has proven its worth: Our distribution boxes offer the necessary installation space for pluggable installation - for the most diverse applications in the most diverse areas of use: Our distribution box can be used wherever high demands and harsh. A distribution box is a low-voltage electrical enclosure that receives incoming power and distributes it safely to multiple outgoing circuits through protective and switching devices such as MCBs, RCDs, RCBOs, fuses, isolators, busbars, neutral bars, earth bars, and surge protective devices.