JVL1-63 II I series without overcurrent protection of residual current circuit breaker (RCCB) products are mainly used in power distribution lines used to indirect contact protection, can also be used to fire danger caused by ground fault current protection, delta I n < 30 ma RCCB when electric shock protection failure also can be used as supplementary protection measures, and the use of electromagnetic or electronic leakage tripping system.> this product is suitable for non-professional workers have been using, and does not require maintenance.