ZN28A-12 12KV Indoor High-voltage Vacuum Circuit Breaker

ZN28(A)-12 series vacuum circuit breaker is an indoor high voltage switch with rated voltage 12KV, 3 phases AC 50 HZ . This product conforms to the standard GB1984-89 .

Product Details Company Profile

Description

Place of Origin: Zhejiang, China (Mainland)
Brand Name: hossin
Model Number: ZN28-12
Type: High Voltage
Poles Number: 3
Rated voltage: 12KV
Rated Current: 630A 1000A 1250A 1600A 2000A 2500A 3150A

ZN28(A)-12 series vacuum circuit breaker is an indoor high voltage switch with rated voltage 12KV, 3 phases AC 50 HZ .

This product conforms to the standard GB1984-89 .

There are two types of the main structure of circuit breaker: one is circuit breaker and operation mechanism installed into one body. The other is circuit breaker and operation mechanism installed separately. The first one is the basic type of ZN28-12; The other type(split type) is applied for various fixed switchgear cabinets, such as GG-1A(Z) , XGN2-12(Z) etc.

This product can match in use with CD17,CD10A Model DC magnetic operating mechanism or CT17 and CT19 model spring energy storage operating mechanism.

1. Altitude: ≤1000m;

2. Ambient temperature: -25°C ~+40°C ;

3. Relative humidity: daily average ≤95% , monthly average ≤90% ;

4. Earthquake intensity: 8 degree; 5. It should work in occasions without flammable and explosive matter, without corrosive chemical and frequent severe vibration.

NO	item		unit	specification
				20KA	25KA	31.5KA	40KA
1	rated voltage		KV		12
2	higest working voltage		A	630.125	1250.16	1250.1600.2000.2500	1600.2500.3150
3	rated breaking current for short-circuit		KA	20	25	31.5	40
4	Rated short circuit switching current (peak)		KA	50	63	80	100
5	rated peak withstand current		KA	50	63	80	100
6	rated withstand current for short-circuit in 4 mins		KA	20	25	31.5	40
7	rated insulated level	frequency withstand (before and after rated breaking and closing )	KV	42(48)
		impact (before and after rated breaking and closing )		75(84)
8	rated operational			breaking -0.35-closing breaking 180s-closing breaking
9	lifetime		Times	10000
10	breaking times for rated current in short-circuit		Times	30		20
11	clearance between open contacts		mm	11±1
12	overtravel		mm	4±1
13	three phaseclosing and breaking		ms	≤2
14	Contact switching bounce time		ms	≤2
15	average breaking speed		m/s	1.2±0.3
16	average closing speed		m/s	0.6±0.2
17	time for breaking	under highest operational volatge	s	≤60
		under lowest operational volatge		≤80
18	time for closing		s	≤100
19	Single-phase circuit resistance		u Ω	≤45		≤25
20	Static head accumulated allow wear thickness		mm	3
21	The oil buffer buffer stroke