DZ20 Series MCCB

1. Scope   of  application

The DZ20 series molded case circuit breaker has a rated insulation voltage of 660V, AC 50Hz or 60Hz, a rated working voltage of AC400V, and a rated current of 1250A. Generally used for power distribution, circuit breakers with rated currents of 225A and below, as well as 400Ytype circuit breakers, can also be used for protecting motors. Under normal circumstances, circuit breakers can be used for infrequent switching of circuits and infrequent starting of motors.

Four pole circuit breakers are mainly used in 3 phase 4 wire systems with AC 50Hz, rated voltage below 380V(400V), and rated current between 100 and 630A. They can protect users and completely disconnect the power supply, ensuring safety.

Distribution circuit breakers are used in distribution networks to distribute electrical energy and can serve as overload, short circuit, and under voltage protection for lines and power equipment.

Circuit breakers for protecting motors are used in distribution networks for starting and breaking squirrel cage motors during operation, as well as for overload, short circuit, and     under voltage protection of motors.

This product complies with GB14048. 2 standard.

1. Model and Meaning

Accessories code          Overload current separator method	Instantaneous separator	Duplex     separator
Attachment Name
Not have	200	300
Alarm contact	208	308
Shunt separator	210	310
Auxiliary contact	220	320
Lack of voltage separator	230	330
Shunt release Auxiliary contact	240	340
Shunt release Under voltage release	250	350
Two sets of auxiliary contacts	260	360
Auxiliary contact Under voltage release	270	370
Shunt separator Alarm contact	218	318
Auxiliary contact Alarm contact	228	328
Lack of voltage separator Alarm contact	238	338
Shunt separator Auxiliary contact Alarm contact	248	348
Shunt separator Lack of voltage separator Alarm contact	258	358
Two sets of auxiliary contacts Alarm contact	268	368
Lack of voltage separator Auxiliary contact Alarm contact	278	378

Note: 1. Users can select the specifications listed in the table according to their needs,  but in one circuit breaker,  it should not exceed the items specified in each cell of the table.

2. Auxiliary contacts 400A and above are two normally open and two normally closed,  while those below 225A are one normally open and one normally closed.

3. The circuit breaker has under voltage release and shunt release. Its voltage specifications include 220V and

380V AC,  and 110V and 220V DC. The voltage of the under voltage release is only available in AC specifications.

4. The alarm contacts are all one normally open and one normally closed contact;

5. There are no specifications for 248,  258,  278,  348,  358,  or 378 in the shell frame grades of 100A and 225A.

*Duplex release - a release device with instantaneous release and thermal release.

3. Structure    characteristics                                                                                              

This series of circuit breakers is based on the Y-type product and consists of four parts:insulation shell, operating mechanism, contact system, and separator. The operating mechanism of a circuit breaker has the function of quickly closing and breaking the contacts, and its”closing”, "opening”, "re closing", and"free separation"positions are distinguished by the position of the handle. The C-type, J-type, and G-type circuit breakers are derived from the Y-type basic product design(except for the C-type 160A). The J-type circuit breaker is a structural improvement of the contact of the Y-type circuit breaker, so that in the event of a short circuit, the moving contact can quickly disconnect before the mechanism operates, achieving the goal of improving the making and breaking capacity.

The G-type circuit breaker is a repulsive current 1imiting contact system composed of parallel conductors connected in series behind thee bottom plate of the Y-type circuit breaker. This system is longer than the repulsive contact of the J-type and has a larger breaking distance,    so it can limit current more quickly.

The neutral pole (M)of a four pole circuit breaker is not equipped with a release element and is located at the rightmost position. During the opening and closing process, the neutral pole is specified to come into contact before the other three poles when closed, and then open after the other three poles when opened.

C-type circuit breakers are designed to meet the needs of distribution protection in power grids with transformers of 630KVA and below.

By using economical materials to simplify the structure and improve the process, they can achieve good economic results.

3. Appearance and Dimensions

Model Unit in mm	External dimensions													Installation dimensions
	Front panel wiring									Backboard wiring
	W	L	H	W1	L1	L2	H1	H2	H3	W1	L3	H4	H5	A	B	d
DZ20Y-100	105	165	86. 5	70		215	103	26. 5	26. 5	70	147	55. 5	55. 5	35	126	5
DZ20J-100
DZ20G-100			140			218. 5	156. 5		80. 5		140. 5
DZ20C-160	108	155	84				106. 5	34	34	70	212. 5	64	64	35	135	4. 5
DZ20Y-225	108. 5	256. 5	105	70	326. 5	402	142	19. 5	19. 5	70		47	90	35	196. 5	4. 5
DZ20J-225
DZ20G-225	108. 5		187				227	38	103. 5				100
DZ20C-250	109	208	105	70	298		142	13. 5	13. 5	70	219	75	128	35	73	4. 5
DZ20Y-400	155	276	116	102	391		149. 5	26. 5	26. 5	102	247	80	125	51	240	7
DZ20C-400
DZ20J-400			108	140	367		147	21. 5	21. 5	140	233	90	90	70	201	7
DZ20G-400			208			394	247	75	121. 5			85	119
DZ20Y-630	210	268	108				147	21. 5	21. 5			90	90
DZ20J-630
DZ20Y-1250	212	393	140	142	559		216	31	31	140	325	124	184	70	360	10