... 6poles TB Terminal Block TB4506TB series adopt plate-type,screw-clamping,low base, sealed and integral construction, rating ... .Adopt flaming- retarding VO- grade PC as plastic base. The screw increase the bearing force after heart treatment, no ... or polycarbonateContact: copper pieces, tin plated brass screwsCover: reinforced plastic, ensures heat-resistance, good toughness and no crackRated voltage ...