Model parameters and structural accessories of the

DZ20 circuit breaker model parameters and structural accessories

dz20 circuit breaker scope of application

this type of circuit breaker is assembled in the structural form of plastic shell. The rated insulation voltage parameter of DZ20 circuit breaker is 660V and ac/50hz, but it should be noted here that if the shell frame is 225A or below, its rated insulation voltage is 400V. The rated working voltage of DZ20 circuit breaker is 380V and below, and its rated current range is 32A to 1250A. If the shell frame is 225A and below, the rated working voltage of the circuit breaker is 400V

normally, Chint DZ20 circuit breaker is installed in the power distribution system, but equipment with 400A shell frame and the following model parameters can also protect the motor, but most of the time, DZ20 circuit breaker can be used for infrequent line rotation or infrequent motor startup

dz20 circuit breaker model parameters and structure Annex I

if the DZ20 circuit breaker is used in the distribution system, it can distribute electric energy and provide protection in case of overload and short circuit faults of lines or power supply equipment. In the distribution network, DZ20 circuit breaker used for motor often plays the role of breaking, overload and short circuit protection when the squirrel cage motor starts and operates

this type of circuit breaker shell frame can improve the effectiveness and speed level. The rated current parameter range is a three pole (3P) device from 100A to 630A. It has a transparent cover and the cover is made of new high temperature resistant and high-strength polycarbonate material. We can clearly and directly judge the on-off state of the contact of DZ20 circuit breaker, which is widely used in temporary electric fields on construction sites

dz20 circuit breaker model meaning

dz20 circuit breaker model parameters and structure Annex II

note:

1. Common equipment is not marked in the model by code, and the equipment with transparent cover will be represented by "t"

2. The distribution circuit breaker also has no code mark, and the DZ20 circuit breaker used to protect the motor will be represented by "2"

3. There is no code mark for direct operation with the handle. The electric operation will be represented by "P" and the rotating handle will be represented by "Z" (here it is suggested that DZ20 circuit breaker with shell frame grade of 1250A does not have a rotating handle)

4. According to the rated limit short-circuit breaking capacity, it can be divided into c-economic type and y-general type

dz20 circuit breaker parameter specification

1. Main technical parameters are shown in the figure below

dz20 circuit breaker model parameters and structure Annex III

2. Short circuit protection current setting value parameters are shown in the figure below

dz20 circuit breaker model parameters and structure Annex IV

note: model dz20c The force value measured by Y is always too large or too small -100 and 160 circuit breakers, when in ≤ 40a, the setting value of the instantaneous action current for power distribution is 500A, if not, the current is 10In. If the DZ20 circuit breaker is used for motor protection, the setting value of the instantaneous action current is 700a, and the non action current is 12in

dz20 circuit breaker structure size

the whole circuit breaker is based on Y-type equipment, and its overall structure is composed of insulating shell, contact system, operating mechanism and release accessories. The operating mechanism of DZ20 circuit breaker has the function of quick closing and breaking of contacts, and its opening, closing and free tripping positions are distinguished by the position of the handle

dz20y-100... The outline and installation dimensions of 225 circuit breaker are shown in the figure below

dz20 circuit breaker model parameters and structure Annex V

dz20y-400 The outline and installation dimensions of 1250 circuit breaker are shown in the following figure

DZ20 circuit breaker model parameters and structure Annex VI, so each load can only reach a certain load

DZ20 circuit breaker can be equipped with accessories

due to different installation site requirements and standards, there may be more requirements for the function of the circuit breaker, so in addition to the basic configuration, DZ20 circuit breaker can also be equipped with additional relevant accessories to provide overall performance, In order to meet the application in different places, the specific equipment accessories are divided into internal and external

the internal accessories of DZ20 circuit breaker are shown in the following figure

model parameters and structure of DZ20 circuit breaker Annex VII

note:

1. The specifications in the above figure are selected and assembled according to actual needs, but the items specified in each grid in the figure cannot be exceeded in one equipment

2. Alarm contact accessories are usually one normally open and one normally closed, while DZ model has no alarm contact

3. The accessories of thermal magnetic release adopt two combined forms of electromagnetic and thermal release

4. The DZ model has no specifications such as 230/330/238/338/250/350/270/370

the external accessories of DZ20 circuit breaker are shown in the following figure

DZ20 circuit breaker model parameters and structure annex VIII

DZ20 circuit breaker protection characteristics

1. Shunt release: the rated control power supply voltage is AC220V, AC380V, and when the rated control power supply voltage is between 70% and 110%, it should enable the circuit breaker to reliably trip

2. Undervoltage release: the rated working voltage is AC220V and AC380V. When the voltage drops (or slowly drops) to the range of 70% to 35% of the rated voltage, the release accessories need to act. Moreover, when it is 35% lower than the rated voltage of the release, the undervoltage release should prevent the closing action of DZ20 circuit breaker, and ensure that the circuit breaker can be closed smoothly when the power supply voltage is equal to or greater than 85%

3. Alarm contact: the rated working voltage is AC220V and the agreed heating current is 3a

4. Auxiliary contact: when installing shunt and undervoltage releases at different times, DZ20 circuit breaker can be optionally equipped with auxiliary contact accessories, and the specific rated parameter values and making and breaking capacity of the accessories are shown in the figure below. The operating performance times of the auxiliary contact are the same as those of the DZ20 circuit breaker when it is not powered on, but the operating times are 6050 when it is powered on, and it will be the same as the equipment when the operating performance times of the circuit breaker are less than 6050

dz20 circuit breaker model parameters and structure annex IX

note: pe=30w at and below 225A, pe=45ws at and above 400A in the figure, pe= is steady-state power loss

the inverse time limit breaking characteristics of DZ20 circuit breaker are shown in the following figure

model parameters and structure of DZ20 circuit breaker annex x

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