DW914B Air Circuit Breaker

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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.

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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