HEAVYCON Plastic DIN Rail Mounting Frames Phoenix Contact HEAVYCON Plastic DIN Rail Mounting Frames comprise base mounting and top frames for B06, B10, B16, and B24 contact inserts. This HEAVYCON series also includes frame adapters for type D15 and D25 contact inserts, as well as both an EVO strain relief and interlocking system. Models in the Phoenix Contact HEAVYCON Plastic DIN Rail Mounting Frames series use either polyamide, steel, or polycarbonate housing. The polycarbonate mounting frames and top frames in this series have achieved a UL 94 V-0 flammability rating, able to operate from -40° to +125°C.