Low-powered reactors, R type, are built with plates with low losses and are coiled with a copper conductor. The connection is achieved with the adequate terminals. In the case of higher power ratings, RB reactors are used, with a magnetic plate nucleus and multiple steel cores, which offer excellent characteristics and a low loss ratio. Aluminum band coils are used (or copper band, on demand) and the input and output connections run through a plate. Both R and RB type reactors have a vacuum varnish sealing to increase the insulation, providing a greater mechanical resistance and reduce the level of noise.