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DW914B Air Circuit Breaker

The DW914B air circuit breaker is used in marine power distribution system with the rated current of 630 to 6300 A, the rated frequency of 50 or 60 Hz, as well as the rated voltage of AC 660 V or less and DC 440V or less. It offers protection against AC overload, under-voltage and short circuit as well as DC under-voltage and short circuit. Also, this low voltage circuit breaker applies to the infrequent conversion of the lines under normal working conditions.

1. Compact structure, small size, light weight, universal parts, high breaking capacity
2. Certified to the national 3C standard, classification society standard and military test standard, etc.
3. Withdrawable design for ease of use and maintenance
4. A wide selection of closing operations (motor storage, manual storage and electromagnet)
5. Various tripping functions secure the equipment and human beings.
6. Provide a diverse range of attachments upon request

This air circuit breaker is an improved product produced on the basis of the technologies introduced from Japan Terasaki Electric Co., Ltd.

Technical Parameters of DW914B Air Circuit Breaker
Model DW914B-630 DW914B-1000 DW914B-1600 DW914B-2000 DW914B-2500 DW914B-3200, 4000 DW914B-5000, 6300
Standard Type For Power Distribution (With Fault Display Function) Long Delay Setting Current Ir1(A)

Delay Time T1(s)
Io×(0.8~0.9~1.0~1.10) adjustable continuously
≤Ir1×105% not operate; ≥Ir1×120% operate
Ir1×600%, 5~30s adjustable continuously (Ir1×150%, 120~180s; Ir1×200%, 60~120s)
Recommended to choose: 5, 10, 15, 20, 25, 30s; error: ±15%
Short Delay Setting Current Ir2(A)

Delay Time T2(ms)
Io×(4~5~6~7~8~9~10) adjustable continuously; error: ±15%
≥Ir2×1.2, 120~420ms adjustable continuously
Recommended to choose: 120, 170, 220, 270, 320, 370, 420ms
Instantaneous Setting Current Ir4(A) Io×(4~5~6~7~8~9~10~12~14~16) adjustable continuously; error: ±20%
For Generator Protection Long Delay Setting Current Ir2(A)

Delay Time T1(s)
Io×1.0, 1.05, 1.10, 1.15, 1.25; error: ±5%
Ir1×120% (or115%), 15~60s adjustable continuously
Recommended to choose: 15, 20, 25, 30, 35, 40, 45, 50, 55, 60s; error: ±15%
Short Delay Setting Current Ir2(A)

Delay Time T2(ms)
Io×(2.0~2.5~3.0~3.5~4.0) adjustable continuously; error: ±10%
≥Ir2×1.2, 120~420ms,adjustable continuously
Recommended to choose: 120, 170, 220, 270, 320, 370, 420 ms
Pre-alarm Setting Current IP(A)

Delay Time TP(s)
Ir1×(0.82~0.96) adjustable continuously; error: ±5%
Ir1×120% (or 115%), 5~10s
Recommended to choose: 10s; error: ±15%
Electromagnetic Type Instantaneous Setting Current (kA) 3,5 5,7,5 7,5,10 7,5,10 7,5,10 10,15 15,20
Error ±20% 7,5 10 15 15,20, 20,25 25
10,15 15,20 15,20, 20,25 25,30 30,40 30,40

As a China-based air circuit breaker manufacturer and supplier, we also offer low voltage circuit breaker for ship, outdoor vacuum circuit breaker, high voltage vacuum contactor, withdrawable switchgear, and more.

Related Names
ACB | Electrical Protective Device

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