... . Main Distribution Frame constitute of the frame body, connection block, test module, alarm systems, test equipment, over voltage ... many dimensions, structure for the use of protection unit and connection block to meet the new, update, modification, maintenance needs.3 ... Contact Resistance ≤ 7mΩ between reed wire and terminal into the connection between the contact resistance ≤ 3mΩ Pull strength: ≥ 25N ...