... to GB14048.2, IEC60947-2 standards. Classification of MCCB 1, Installation type of MCCB: MCCB are suiable for vertical or harizontal ... installation. 2, According to use of MCCB: Distribution circuit protection type, motor protection type; 3, ... 6, According to number of poles: Two poles, there poles, four poles. 7, The neutral poles (N poles) of four poles MCCB has for ...