Power block feature terminal identification options (either write-on marking surface or marker retention feature). In addition, mounting dimensions are provided with each unit and wire ranges and tightening torques are labeled on the product to simplify installation. Five styles of Power block are available mini blocks. Open-style power distribution terminal blocks with aluminum or copper connectors. Open-style feed-through/splicer terminal blocks with aluminum or copper connectors. Power distribution terminal blocks with aluminum connectors with feeder spacing, high SCCR and front barrier. Enclosed power distribution terminal blocks with aluminum or copper connectors. IP20 from the front. Single-pole devices; gangable to create multi-pole solutions. Insulating material max. temperature: 257..F (125..C). UL 1059 Approval E 40735, Guide XCFR2, except where noted.