Air Circuit Breaker

Air Circuit Breaker, the three-phase AC 50Hz rated voltage of 12KV power system of indoor high-voltage switchgear, as power equipment, industrial and mining enterprises power equipment protection and control unit. It is suitable for applications requiring frequent operation at rated operating current, or breaking current several times.

Use of environmental conditions

1, the ambient temperature: the upper limit of +40 ℃, the lower limit of -15 ℃, the daily average of not more than +35 ℃;

2, elevation: ≤ 1000m (if the altitude increases, the rated insulation level corresponding increase);

3, the ambient humidity: the average relative humidity of not more than 95%, the average relative humidity of not more than 90%;

4, earthquake intensity: no more than 8 degrees;

5, the circuit breaker should be installed in the absence of fire, no explosion hazard, no corrosive gases and severe vibration of the place.

Serial number	name		Company	data
1	Rated voltage		KV	12
2	Rated insulation level	1min Power frequency withstand voltage (RMS)		42
		Lightning impulse withstand voltage (peak)		75
3	Rated frequency		Hz	50
4	Rated current		A	630 1250	1250 1600 2000 2500	1600 2000 2500 3150
5	Rated short-circuit breaking current		KA	20；25	31.5	40
6	Rated short-circuit closing current (peak)			50；63	80	100
7	Rated short-circuit breaking current		second			30
8	Rated short-circuit duration		S	4
9	Mechanical life		second	10000
10	Rated operation sequence			-t- and -t1- points*

*Note:20KA、25KA、31.5KA t=0.3s t1=180s; 40KA t=180s t1=180s

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