ZGLEDUN LDW9-1600 ACB Air Operated Circuit Breaker, Air Break Circuit Breaker, AC400V/690V, 3P/4P

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An air Circuit Breaker (ACB) is an electrical device used to provide Overcurrent and short-circuit protection for electric circuits over 800 Amps to 10K Amps. These are usually used in low voltage applications below 450V. 

Leidun ElectricLDW9-1600 series air operated circuit breaker is suitable for the distribution network of AC, 50Hz/60HZ, rated working voltage AC400V/690V, rated current 200A-1600A , used to distribute electric energy and protect lines and power equipment from damaged by faults such as overload, overcurrent, undervoltage, short circuit, single-phase grounding, etc. This Air Circuit Breaker has the characteristics of small size, high breaking capacity, and with multi-functions. LDW9-1600 ACB is suitable for grid-connected operation and protection of general power distribution systems, new energy generation and distribution systems, multi-power distribution networks, inverters, and distributed power rotating motor power supplies.

Normal working conditions:

Ambient air temperature: The upper limit should not exceed +40℃, the lower limit should not be lower than -5℃. The average value of 24h should not exceed +35℃.

Atmospheric conditions: The relative humidity of the atmosphere does not exceed 50% when the ambient air temperature is +40℃. There can be higher relative humidity at lower humidity. The monthly average highest relative humidity of a wet month is 90% while the monthly average lowest temperature is +25℃. the condensation on the surface of the product due to temperature changes must be taken into account.

Installation location: The altitude does not exceed 2000m, and the vertical inclination of the circuit breaker does not exceed 5°C

Pollution degree: Class III

Air circuit breakers with rated working voltage of 690V and below, undervoltage release, and power transformer primary coil are used for installation category IV.

Installation category for auxiliary circuit and control circuit : III


Main Technical Parameter
Series LDW9-1600
Moulded Rated Case Current Inm (A) 1600
Rated Current In (A) 200,250,320,400,500,630,800,1000,1250,1600
Rated Operating Voltage Ue (V) AC50HZ/60HZ    400,690
Rated Insulation voltage Ui (V) 1000
Rated Impulse Withstand Voltage Uimp(KV) 12
Power Frequency Withstand Voltage U(V)Imin 2500
Poles (P) 3, 4
N-pole Rated Current In(A) 100%In
Usage Category GB14048.2 B
GB14048.4 (In<=1000A) AC-3
Rated Ultimate Short-circuit Breaking Capacity Icu (KA)  (Effective Value) AC400V 55
AC690V 42
Rated Operating Short-circuit Breaking Capacity Ics (KA)  (Effective Value) AC400V 50
AC690V 35
Rated Short-circuit Making Capacity Icm (KA) (Peak Value) AC400V 143
AC690V 105
Rated short-time withstand current (Is) Icw (KA) (Effective Value) AC400V 50
AC690V 35
Full Breaking Time (no additional delay) (ms)   25
Closing Time (ms) Max. 70
Electrical Life (times) AC400V In=200A~1000A 1500
AC400V In=1250A~1600A 1200
AC690V In=200A~1000A 1000
AC690V In=1250A~1600A 700
Mechanical Life (times) No Maintenance 3000
Maintenance 10000
Dimension  (mm) Fixed ACB 3P 260x310x240mm
Fixed ACB 4P 330x310x240mm
Drawer Type ACB 3P 275x345x330mm
Drawer Type ACB 4P 345x345x330mm


Accesorries for Air-operated Circuit Breaker (ACB)
Image Description Unit
   Phase Partition SET
Auxiliary switch (6-open and 6-close) PC
Shunt Trip PC
Undervoltage Release  (Auxiliary Suction) PC
 Undervoltage Release   (Automatic Suction) PC
 Time Delay Undervoltage Release PC
Closed Electromagnet PC
 Electromotor PC
  One Lock with One Key PC
Two Locks with One Key PC
Three Locks with Two Keys SET
Mechanical Interlock (Soft) SET
Mechanical Interlock (Hard) SET
 Intelligent Controller 630-2000A SET
 Intelligent Controller 2500-4000A SET
 H-Shaped Smart Shunt Trip PC
  DC Smart Shunt Trip (Module) SET
Vertical In-and-Out Bus Unit 630-1600A SET
Vertical In-and-Out Bus Unit 2000A PC
Voltage Display Unit PC
Load Monitoring Unit PC
 Dual Power Supply Automatic Conversion Controller PC
3P+N  Earth Current Type (W-shaped) PC
Leakage CurrentTransformer PC

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  • 1. Most of new products are guaranteed for 12 months from the date of delivery, some for 18 months;
    2. All products sent for repair shall be guaranteed for 6 months after repair;
    3. Paid repair service can be provided for products beyond the warranty period.

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