Overview

DZW88 series intelligent air circuit breaker (hereinafter referred to as circuit breaker) are characterized by compact structure, small size, high reliability and zero flashover. The rated isolation voltage of circuit breaker is 690V, which is applicable to AC 50Hz and rated working voltage 400V, the rated current is 200 A ~ 2000 A. It is mainly used in power distribution network to distribute electric power and protect circuits and power supply equipment from the hazards of faults such as overload, undervoltage, shortcircuit, and single-phase grounding, and it has a variety of intelligent protection functions. Selective protection can be accurately realized to avoid unnecessary power outage and improve power supply reliability. Under normal conditions, below 630A can also be used for infrequent switching of lines. And it has the isolation function. The technical performance of the circuit breaker conforms to GB14048.2 Low-voltage Switchgear and Control Equipment Part - Low-voltage Circuit Breakers and IEC60947-2 Low-voltage Switchgear and Control Equipment Part II Low-voltage Circuit Breakers.

● Model meanings and classification

Model and meanings

● Category

● Performance of intelligent controller:

a. With functions of overload long-time delay inverse time, short-time delay fixed time and instantaneous. The protection characteristics required for the composition can be set by the user.
b. Single-phase grounding protection function.
c. Alarm function: overload alarm.
d. Self-inspection function: overheating protection and microcomputer self-diagnosis.
e. Test function: tests the operating of the release.

Normal operating conditions and installation conditions

● Ambient air temperature: Upper limit value does not exceed +40℃ ;

Lower limit value is not lower than -5℃ ;

The average value of 24 hours does not exceed +35℃

Note: ① For working conditions with the lower limit of -10℃ or -25℃ , the user should declare to the 

manufacturer when ordering.

② For working conditions with the upper limit exceeds +40°C or the lower limit is below -25°C, the 

user should consult with the manufacturer.

● Altitude: the altitude of the installation site generally does not exceed 2000 meters.

Note: If the altitude exceeds 2000 meters, the user should consult with the manufacturer

● Atmospheric conditions: When the maximum temperature is +40℃ , the relative humidity of air is not more than 50%, while at 

lower temperatures, higher relative humidity is allowed, for example, up to 90% at 20℃ , and special measures should be taken 

for occasional condensation due to temperature changes.

● Pollution level (see Clause 6.1.3.2 of GB 14048.1); Level 3

● Installation conditions: The circuit breaker should be installed in accordance with the requirements specified in the operating 

instructions provided by the manufacturer.

● Mode of incoming and outgoing lines: up and down are OK.

● Structure overview

This circuit breaker is in the form of three-dimensional arrangement, characterized by compact structure and small volume. Each phase of the contact system is enclosed in an insulating base to form an independent chamber. Then the small chamber constitutes the main circuit of the circuit breaker, and the intelligent controller, manual operating mechanism and electric operating 

mechanism are sequentially arranged in front of it to form their own independent units, which is convenient for assembly and maintenance. Circuit breaker structure, see the left picture

1. The fixed type circuit breaker is mainly composed of contact system, intelligent controller, manual operating mechanism, electric operating mechanism and frame;

2. The drawer type circuit breaker consists of a plug-in circuit breaker and a drawer base;A. The guide rail inside the drawer base can slide in and out, and the plug-in circuit breaker is located on the guide rail to enter and exit the drawer, and the main circuit is connected through the insertion of the busbar on the circuit breaker and the insertion of the bridge contact on the drawer base.

B. There are three working positions for the drawer type circuit breaker: “connection” position, “test” position, “separation” position, the position change is realized by rotating the handle in or out. Indication of the three positions is shown by a pointer on the drawer base crossbar.

C. When in the "connection" position, both the main circuit and the secondary circuit are connected; when in the "test" position, the main circuit is disconnected and separated by an insulating partition, and only the secondary circuit is connected, at this time, some necessary operating tests can be carried out; when in the "separation" position, both the main circuit and the secondary 

circuit are disconnected.

● Rated voltage of circuit breakers

Rated insulation voltage Ui： AC690V

Rated Working Voltage Ue：AC400V

Rated impulse withstand voltage Uimp：AC 12kV

Industrial frequency withstand voltage: Main circuit AC2500V：Secondary Terminal Block AC 2Ui+1000

( ≥ 1500V)

A. It is characterized by compact structure, small size, high reliability and zero flashover.

B. It is mainly used in power distribution network to distribute electric power and protect circuits and power supply equipment from the hazards of faults such as overload, undervoltage, short-circuit, and single-phase grounding, and it has a variety of intelligent protection functions.

C. Selective protection can be accurately realized to avoid unnecessary power outage and improve power supply reliability.