Connection terminals composed of two types of diffrent materials. One is made of absafil epoxy resin plate after etching, whichis called board base, not easy to damage and convenient to use with dielectric resistance. The other is pure copper foil, whichuses phenolic glue as fundamental material, thus has certain amount of deflection, and may glue on the arc surface which iscalled glue base.

The copper foild surface of the connection ends is covered with solder, thus can be welded directly.