ZN63A-12 Indoor Vacuum Circuit Breaker

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The ZN63A-12 indoor vacuum circuit breaker is a switching device with the rated voltage of AC 12kV and the rated frequency of 50Hz. It is suitable to work as the control and protection equipment in power plants, industrial and mining enterprises, as well as other places. It is applicable to occasions requiring frequent operations.

This indoor vacuum circuit breaker has features of simple structure, reliable performance, easy installation and maintenance, as well as long service life. It adopts a spring energy storage type operating mechanism, which can be manually or electrically (AC or DC) operated.

Composite insulation is adopted by this high voltage circuit breaker. The vacuum arc chute is installed inside an insulation cylinder, so it is less subjected to external environment impact and mechanical damage and has a strong anti-pollution ability.

Conditions of Use Environment

Ambient Temperature	Upper limit: 4 0 ℃
Ambient Temperature	Lower limit: -25 ℃
Ambient Humidity	Daily average relative humidity≤ 95%
	Monthly average relative humidity≤ 90%
	Daily average saturated vapor pressure≤ 2.2×103MPa
	Monthly average saturated vapor pressure≤ 1.8×103MPa
Altitude	≤1000m
Earthquake Intensity	≤8degree
Place of Use	No risk of fire or explosion, no chemical corrosion, no severe shaking

1. Main Technical Parameters

No.	Item	Unit	630-25	1250-31.5	2500-31.5	3150-40	4000-40	4000-50
1	Rated Voltage	KV	12
2	Rated Impulse Withstand Voltage (Peak)	KV	75
3	Rated Short-time Withstand Voltage (1min)	KV	42
4	Rated Frequency	HZ	50
5	Rated Current	A	630	1250	2500	3150	4000	4000
6	Rated Short-circuit Breaking Current	KA	25	31.5	31.5	40	40	50
7	Rated Short-circuit Closing Current	KA	63	80	80	100	100	125
8	Rated Peak Withstand Current	KA	63	80	80	100	100	125
9	Rated Short-time Withstand Current	KA	25	31.5	31.5	40	40	50
10	Rated Operating Sequence		O-0.3s-CO-180s-CO			O-180s -CO-180s-CO
11	Rated Short-circuit Current Breaking Times	times	50	50	50	20	30	20
12	Rated Current Breaking Times	times	20000			10000
13	Rated Breaking Current of Single or Back-to-back Capacitor Bank	A	630/400
14	Mechanical Life	times	20000			10000
15	Power of the Energy Storage Motor	W	70
16	Energy Storage Time	s	≤ 10
17	Voltage of the Energy Storage Motor	V	AC/DC, 220/110
18	Rated Short Circuit Duration	s	4

Note: When the rated current reaches 4,000A, forced air cooling is required.

2. Technical requirements

No.	Item	Unit	630-25	1250-31.5	2500-31.5	3150-40	4000-40	4000-50
1	Contact Travel	mm	11±1
2	Contact Overtravel	mm	3.5±0.5
3	Phases Center Distance	mm	210±0.5	210±0.5	275±0.5	275±0.5	275±0.5	275±0.5
4	Non-synchronization of the Closing and Opening of the Three Phases	ms	≤ 2
5	Contact Closing Bounce Time	ms	≤2	≤2	≤2	≤3	≤2	≤2
6	Opening time	ms	20~60
7	Closing Time	ms	35~100	35~100	35~100	30~70	30~70	30~70
8	Average Opening Speed	m/s	0.8~1.3
9	Average Closing Speed	m/s	0.5~0.9
10	Conductive Loop Resistance of Each Phase	µ Ω	≤50	≤45	≤25	≤25	≤25	≤25

We are a professional indoor vacuum circuit breaker manufacturer and supplier in China. We provide various types of products such as high voltage vacuum contactor, gas insulated switchgear, low voltage distribution board, and air circuit breaker.

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