KW20-12 outdoor intelligent spring vacuum circuit breaker

KW20-12 outdoor intelligent spring vacuum circuit breaker is a common box spring operating mechanism circuit breaker independently developed by our company. It is mainly used for breaking and closing the load current, overload current and short-circuit current in the power system. It is suitable for protection and control in substations and power distribution systems of industrial and mining enterprises, and is more suitable for rural power grids and places with frequent operations.

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key word:

breaker

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KW20-12 outdoor intelligent spring vacuum circuit breaker

Overview
KW20-12 outdoor intelligent spring vacuum circuit breaker is a common box spring operating mechanism circuit breaker independently developed by our company. It is mainly used for breaking and closing the load current, overload current and short-circuit current in the power system. It is suitable for protection and control in substations and power distribution systems of industrial and mining enterprises, and is more suitable for rural power grids and places with frequent operations.
The switch adopts vacuum arc extinguishing, SF6 gas insulation, excellent overall sealing, and is filled with "zero" gauge pressure SF6 gas, which has no possibility of gas leakage, high reliability and maintenance-free.

Citation Standards

GB1984	AC High Voltage Circuit Breaker
GB/T 11022	Common technical requirements for high voltage switchgear and controlgear standards
GB/T 311.1	Insulation coordination of high voltage power transmission and transformation equipment
GB/T 3309	Mechanical test of high voltage switchgear at room temperature
DL/T 593	Technical Guidelines for Common Ordering of High Voltage Switchgear
DL/T 402	Technical conditions for ordering AC high voltage vacuum circuit breakers

Ambient conditions used
◆Working environment temperature: -40～+70℃
◆Working environment humidity: 0～95%
◆Working site altitude: ≤3000 m
◆Wind pressure: ≤ 700 Pa
◆Icing thickness: ≤10mm
◆Outer insulation pollution grade: Ⅳ
◆Earthquake intensity: ≤ 8 degrees
Note: This product is not suitable for fire, explosion hazard, chemical corrosion and severe vibration and other places.

Model description
Product model and meaning:

111

Technical parameters

Technical parameters of circuit breaker switch

serial number	Name Name	Units	Parameter Number
1	Rated voltage	kV	12
2	Rated current	A	630/1250
3	Rated frequency	Hz	50
4	Rated lightning impulse withstand voltage	kV	Ground 75/Fracture 85
5	Rated short-term power frequency withstand voltage (1min)	kV	Wet test 34, dry test 42/fracture 48
6	Rated short-circuit breaking current	kA	20/25
7	Rated short-circuit breaking times	times	30
8	Rated thermal stability current (4s)	kA	20/25
9	Rated dynamic stable current	kA	50/63
10	Rated short-circuit making current	kA	50/63
11	Mechanical life	times	10000
12	Secondary circuit power frequency withstand voltage (1min)	KV	2
13	Nominal operating sequence		O-0.3S-CO-180S-CO
14	Net weight	KG	100

Mechanical parameters

serial number	Name Name	Units	Ref Number
1	Itinerary	mm	11±1
2	Contact Spacing	mm	9±1
3	Overtravel	mm	3±1
4	Close time	ms	≤60
5	Opening time	ms	≤60
6	Open and close different periods	ms	≤2
7	Close bounce	mm	≤2
8	Average opening speed	m/s	1.0±0.2
9	Average closing speed	m/s	0.6±0.2
10	Mechanical times	times	10000
11	Main circuit resistance	μΩ	≤80
12	Main circuit resistance (with isolation switch)	μΩ	≤ 180

Dimensional drawing

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