... currents, switch,isolation NB1 circuit-breakers are used in domestic installation,as well as in commercial and electrical distribution ... considered: the earthing systems(TNS,TNC),short-circuit current at the circuit-breaker installation point, which must always be less ... high inrush current at the circuit closing(lv/lv transformers,breakdown lamps). Miniature circuit breaker NB1-D10 3P UL certificated ...