Various circuit breakers are assembled to the distribution box which called consuming unit. It is used for household and commercial low voltage distribution protection. Designed according to IEC standards with KEMA, CB&CE Certificate. For instance, MCB confirms to IEC60898, RCCB confirms to IEC61008, RCBO confirms to IEC61009, Isolator confirms to IEC60947. They are easily to be assemble and words with the same series of compact circuit breakers together,  saving 50% of space usage.