... or harizontal installation. 2, According to use of MCCB: Distribution circuit protection type, motor protection type; 3, According to connection way: Front panel connection ... (N poles) of four poles MCCB has for types: 8, Type A: No overload release on N pole, which is making at ... , which closing and opening with the other three poles. 11, Type D: With overload release on N pole, which making all time ...