... is constant, keep good electric connection and make no damage to lead.3.self-seam frame,wet proof, waterproof, and anti ... resistance, impulse current can be up to 15KA.5.Special insulated case body, resistance to illumination and environmental aging, the insulation ... .6.Arc surface design, apply to connection scope (1.5mm2-400mm2). Adopted special connecting tablet, apply to joint of Cu(Al) and ...