Scope of Application
DZ20Y series moulded current circuit breaker(DZ20Y MCCB) is mainly used for power distribution  in lines of AC 50Hz, rated insulation voltage 660V, rated operating voltage 380/400V or below, with its rated current 16A~1250A. Among the series, Y,J,Q type circuit breaker with its rated current 225A or below and Y type breaker with frame size 400A can also be used to protect motors. Under normal circumstances, this product can also used as infrequent switching for lines and motor separately.
4P DZ20 MCCB is mainly applicable to 3 phase 4 wire system with frequency AC 50Hz, rated voltage 400V or below, rated current 16A~630A, to cut off power supply and ensure security. Thus, unlike any other circuit breaker, this type of MCCB ensure its neutral pole is without current.
DZ20 MCCB can be used to distribute power energy in grid and protect protection against overload, short circuit and under-voltage for circuits and electric equipment. Motor protective circuit breaker can used to start up and break the squirrel-cage motor in power distribution system. It can also protect the motor against overload, short-circuit and under-voltage.   
The cover of DZ20 3P MCCB with frame size current 100A-630A is transparent. So, users can check its internal operation status.
DZ20 MCCB complies with Standard GB14048.2.

Types and Specifications
MCCB/ Design code/ Rated ultimate short circuit breaking capacity level/ Frame size current/Operating method/ Number of poles/ Tripping method & accessory code/ Function code 
Notes for the meaning of type:
a.No code for power distribution. 2 for motor protective circuit breaker.
b.No code for direct handle operation, P for motor operation, Z for rotary handle(apart from MCCB with frame size current 1250A)
c.Rated ultimate short-circuit breaking capacity: C for economic type, Y for normal type, J for higher type, G highest type.

Accessory Code