DZ20 series (transparent) plastic-case circuit breaker

DZ20 series (transparent) plastic-case circuit breaker

DZ20(transparent) plastic-case circuit breaker, suitable for AC 50Hz, rated current from 16A to 2000A, rated insulation voltage 660V, rated working voltage 380V and below circuit, generally used for distribution, among which Y, J...

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First, scope of application

DZ20 series (transparent) plastic shell type circuit breaker (hereinafter referred to as circuit breaker),Suitable for AC 50Hz,Rated current from 16A to 2000A,Rated insulation voltage 660V,Rated operating voltage 380V and below the circuit,Generally used for power distribution,Among them, Y, J, G type shell frame rated current 225A and Y type 400 circuit breakers can also be used to protect the motor,Under normal circumstances,The circuit breaker can be used as the infrequent conversion of the line and the infrequent start of the motor。
Circuit breakers used in distribution networks to distribute electrical energy and to protect lines and power supplies from overload, short circuit and undervoltage。

DZ20 (transparent) Plastic-case circuit breaker display

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

The circuit breaker press GB/T14048.2-2008<低压开关设备和控制设备 第2部分:断路器>及相关标准设计、制造与检验。

Second, normal working and installation conditions

● Ambient air temperature
a) The ambient air temperature does not exceed +40 ° C, and the average temperature value within 24 hours does not exceed +35 ° C。
b) The lower limit of ambient air temperature is -5℃;
●海拔:
The elevation of the installation site does not exceed 2000m。

● Atmospheric conditions
When the maximum temperature is +40 ° C, the relative humidity of the air does not exceed 50%, and higher relative humidity can be allowed at lower temperatures, such as 90% at +20 ° C。Special measures should be taken for condensation that occasionally occurs on the product due to temperature changes.
● Pollution level: 3 poles。
● Installation category: III pole
● Installation conditions:
The circuit breaker should be installed in a place where there is no rain or snow attack, no significant shaking and shock vibration, and the circuit breaker should generally be installed vertically。

Three, circuit breaker type classification

Circuit breaker model and its meaning
DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

Note: 1 distribution circuit breaker has no code;The circuit breaker used to protect the motor is represented by 2。
2 handle direct operation without code;Electric operation is denoted by P, rotary operation is denoted by Z

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

Third, basic parameters and technical performance

The rating and limit value of the main circuit
Circuit breaker ratings and limit values are shown in Table 2

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

 

Control circuit
Rated control supply voltage (Us) of shunt release and motor mechanism and rated operating voltage (Ue) of undervoltage release

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

 

Coordination of auxiliary contacts and short-circuit protection devices (SCPD)
Auxiliary contact in series with fuse (PL6-25/6 recommended)。在1.1 times rated operating voltage, power factor 0.5~0.Between 7, can withstand the fuse fuse time through the expected circuit breaker current of 1000A.

Shunt trip action value
When the supply voltage is equal to any voltage between 85% and 110% of the rated control supply voltage Us, the shunt trip should be caused under all operating conditions of the circuit breaker。

Operating value of the undervoltage trip device
When the power supply voltage drops (even slowly) to the rated operating voltage range of 70% to 35%,Undervoltage release should operate,Undervoltage releaser When the supply voltage is equal to 35% of the rated operating voltage of the releaser,The undervoltage release shall prevent the circuit breaker from closing;When the supply voltage is equal to or greater than 85% of the rated operating voltage of the undervoltage releaser,Under hot conditions,Should be able to ensure that the circuit breaker closed reliably。

Overload protection characteristics of overcurrent release
1,Distribution circuit breaker
When the ambient air temperature of the circuit breaker for distribution is +30℃, the inverse time-limit disconnection characteristics without temperature compensation when all poles are energized at the same time are shown in Table 4, and the correction curve of the influence of the ambient air temperature change on the characteristics should be provided.
2,Circuit breakers for motor protection
When the ambient air temperature of the circuit breaker for motor protection is +40℃ and all poles are energized at the same time, the inverse time-limit disconnection characteristics without temperature compensation are shown in Table 5, and the correction curve of the influence of the ambient air temperature change on the characteristics should be provided.

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

 

3.When used as motor protection three-pole overload releaser Disconnection characteristics only when the two poles are energized For three-pole overload releaser, at ambient air temperature +40℃, as specified in Table 6。

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

 

4.The setting value of short-circuit protection current is shown in Table 7

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

注:
1.DZ20Y, J, G-100 circuit breaker, when the rated current of the circuit breaker In≤40A, the instantaneous operating current value is 600A, and the non-operating current is 10In。
2.The allowable error of setting value is ±20%

Fourth, shape and installation size

The installation dimensions of the circuit breaker are shown in Figure 1a, Figure 1b and Table 8

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group
DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

Fifth, DZ20J-2000 dimensions and installation dimensions

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

DZ20 series (transparent) Plastic-case circuit breaker - Shanghai People Electrical Switch Factory Group

5. Instructions for ordering

The following items must be filled in clearly when ordering
● Circuit breaker model;
● Rated current value;
● Short-circuit protection current setting value (if not indicated when ordering, all according to 10In supply),
● Trip mode and accessory code (see Table 2) : If not indicated when ordering, all shall be supplied without accessories (i.e. 3300 or 4300) : When ordering circuit breakers with shunt trip device or undervoltage trip device, the rated control power supply voltage must be indicated;
● Operation mode: When ordering, do not indicate the supply according to manual operation;
● Fill in examples:
DZ20Y-630P/3310 500A, electric operation, shunt AC 220V,100 sets。
DZ20Y-400/33002 350A, undervoltage AC 380V, protection motor, 100 sets。
DZ20J-225Z/3320 180A, rotating handle, auxiliary contacts, 100 sets。

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