high Dengsity Double side Main Distribution Frame, Vertical terminal blocks for 100 pair Protection Terminal Block,Equipped with OverVoltage and OverCurrent Protection Block, Back Side For Testing/Test Wiring Block 128 Pair,Horizontal Installations. Other Accessories:Punch Down Tool,Test Cord,etc Aluminum frame for MDF Frame Body,Assembled Structure easy for installation Ask us for dimension and other details Brief introduction: 1) The main distribution frame (MDF), a double-sided frame, consists of vertical side (line side), horizontal side (exchange side), alarming system and the frame itself, with optional stepladders 2) The vertical side can be equipped with protection connection blocks (100 pairs), FA906 protectors as well as alarm system 3) The horizontal side can be equipped with test connection blocks (100 pairs) Features: 1) Complete I.D.C. type MDF 2) Sound and reliable protection against over voltage and over current 3) Unique FS Fail-Safe protection and self-recovery protector 4) Modular design, easy installation, quick wiring, convenient maintenance 5) The application of PC material greatly improves module's strength and anti-aging capability 6) Up to four grades of audio/visual alarms are provided 7) Preferable capacity: 4,000, 5,000 6,000 pairs are optional 8) Besides, due to its modular design, any capacity can be reached at your preference Technical specifications: 1) Insulation resistance: ≥1,000MΩ 2) Dielectric strength: ≥1,000V (AC voltage, 50Hz for 1 minute), no spark-over and no flying arc 3) Contact resistance between conductor and reed: ≤3mohm 4) Contact resistance between reeds: ≤7MΩ 5) Conductor diameter range: 0.4 - 0.8mm 6) Pulling strength: ≥25N