... 63A, DC110V/1P, DC125V/2P; Application: for protection of circuits from over-load and short-circuit; and for infrequent making and ... earthing systems(TNS,TNC),short-circuit current at the circuit-breaker installation point, which must always be less than the breaking ... the circuit closing(lv/lv transformers,breakdown lamps). Miniature circuit breaker NB1-D10 3P UL certificated