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Air Circuit Breaker
High Voltage Air Circuit Breaker (AC800~1140V)
  • LDW9 Series
High Voltage Air Circuit Breaker (AC800~1140V)
Product Overview
LDW9 High Voltage Air Circuit Breaker (ACB), also known as an intelligent universal circuit breaker or frame circuit breaker, is designed for power distribution networks operating at an AC 50Hz, with a rated working voltage 800V~1140V and a rated working current of 7500A.

This ACB is utilized for the distribution of electrical energy and serves to protect cables and power equipment from various faults, including overload, under-voltage, short-circuits, and grounding issues. It incorporates a range of curve protection controllers that offer comprehensive protection functions, making it particularly suitable for power distribution networks that require enhanced power supply reliability and aim to minimize unnecessary power outages.

The 3H type smart controller is equipped with a communication interface that facilitates connectivity with field buses, thereby enabling four remote functionalities: “telemetry”, “remote adjustment”, “remote control” and “remote message” to fulfill the requirements of control automation. The integration of a leakage transformer with the corresponding smart controller provides leakage protection. This device can be utilized for motor fault protection within AC 50Hz, 400V network. Under normal conditions, it is suitable for infrequent starting of motors.

The products have successfully obtained “CQC”certification from the China Quality Certification Center.

LD

W

9

-

HU

/

4







Company Code

Air Circuit Breaker or Frame Circuit Breaker or Intelligent Universal Circuit Breaker

Design No.

Inm=2500、Inm=4000、Inm=7500

High Voltage Level

3 Poles、4 Poles

Intelligent Controller:M-type: Digital display, 3M-type: LCD display standard, 3H-type: LCD communication interface

200A, 400A, 630A, 800A, 1000A, 1250A, 1600A, 2000A, 2500A, 2900A, 3200A, 3600A,

4000A, 5000A, 6300A, 7500A

C: Drawer Type, F: Fixed type

Horizontal Rear, Vertical Front, Vertical Rear

◎Button lock device

◎Phase partition for drawer type circuit breaker

◎Under-voltage release

◎"OFF" locking device (key lock)

◎Mechanical interlocking: 2 or 3 circuit breakers horizontal steel cable interlocking, 2 or 3 circuit breakers vertical lever interlocking

◎External neutral N current transformer  

◎DC power supply module


Note:

The standard configuration includes an M-type intelligent controller, four sets of auxiliary switch conversion contacts, and a horizontal rear connection method; 

Voltage value for the intelligent controller, shunt release, under-voltage release, and closing electromagnet mechanism should be indicated.


● Ambient Air Temperature:-5℃to +40℃  ( Please refer to temperatures derating factor for above +40℃ to +60℃).

● Installation Location:Install the ACB according to the requirements in the user manual. The altitude shall not exceed 2000m. ( Please refer to high altitude derating factor for altitudes above 2000m). The vertical tilt of the circuit breaker should not exceed 5°.

● Atmospheric Conditions: The relative humidity of the air at the installation site should not exceed 50% at a maximum temperature of +40℃. At lower temperatures, higher relative humidity is acceptable, such as reaching 90% at 20℃. It is important to consider the condensation on the product surface due to temperature changes.

● Pollution Level:III

● Installation Category:The circuit breaker main circuit, undervoltage release coil, and power transformer primary coil are used for installation category IV. The installation category of other auxiliary circuits and control circuits is category II.

● ACB is suitable for electromagnetic environments;

● Install the ACB in an area free from explosion hazards, conductive dust, metal corrosion and insulation damage. It should be housed in a cabinet with a door frame, achieving IP54 protection level.


● IEC60947-1, GB/T14048.1: Low voltage switchgear and controlgear - General rules

● IEC60947-2, GBT14048.2: Low-voltage switchgear and controlgear - Circuit-breakers

● IEC60947-4-1, GB/T14048.4: Low-voltage switchgear and controlgear - Contactors and motor-starters

● GB/T2421.1: Environmental testing for electric and electronic products - General and guidance

● GB/T14597: Environmental climatic conditions appearing in different altitudes for electrical products


Model

LDW9-2500HU

LDW9-4000HU

LDW9-7500HU

Ampere Frame Rating (A) Inm

2500

4000

7500

Rated working current(A)In

400、630、800、1000、1250、1600、2000、2500

2000、2500、2900、3200、3600、4000

4000、5000、6300、7500

Rated working voltage(A) Ue

50Hz AC800V、1140V

50Hz AC800V、1140V

50Hz AC800V、1140V

Rated insulation voltage(V)Ui

1150V

1150V

1150V

Rated impulse withstand voltage

Uimp(kV)

12

12

12

Power frequency withstand voltage

U(V)1min

50Hz 3500

50Hz 3500

50Hz 3500

No. of poles

3P/4P

3P/4P

3P/4P

Ultimate short circuit breaking capacity

(kA)Icu

AC400V

100

100

150

AC690V

65

80

100

AC800V

AC1140V

50

50

65

Operating short circuit breaking capacity

(kA)Ics

AC400V

100

100

150

AC690V

65

80

100

AC800V

AC1140V

50

50

65

Rated short-time withstand current

 (kA)Icw/1s

AC400V

100

100

150

AC690V

65

80

100

AC800V

AC1140V

50

50

65

Inherent opening time(ms)

23~32

23~32

23~32

Inherent closing time(ms)

50±10

50±10

50±10

Arcing distance(mm)

0

0

0

Electrical endurance (Cycles)

AC400/690V:7000/3000

AC800/1140V:2500/2000

AC400/690V:7000/2500

AC800/1140V:2000/1000

AC400/690V:2000/1500

AC800/1140V:1200/1000

Mechanical

endurance

(Cycles)

No

maintenance

10000

10000

10000

With
maintenance

15000      

15000

15000

 


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