Products Introduction

Our indoor SF6 circuit breakers are primarily used in indoor high-voltage power distribution systems where safety, reliability, and service life are paramount. They utilize a combination of a vacuum arc extinguishing chamber and SF6 gas insulation, enabling them to reliably and stably perform insulation, arc extinguishing, overload protection, and short-circuit protection functions in various enclosed indoor environments, including high-voltage switchgear, distribution rooms, small substations, commercial buildings, industrial power plants, and urban power grids, providing safe and stable operation assurance for modern indoor high-voltage power distribution systems.

Product Features

1. Indoor SF6 circuit breaker adopts optimized operating mechanism with stable transmission performance, low operating noise and small impact force during opening and closing, effectively reducing mechanical wear and ensuring long-term stable operation under frequent operation conditions.

2. The circuit breaker shell adopts high-strength insulation and anticorrosive materials, has a compact structure and a regular appearance, and is easy to install in standard switchgear such as KYN28 and XGN. The overall seal is good, which can effectively prevent dust and moisture, and ensure stable indoor long-term operation.

3. The frame has high strength and long mechanical life. It can withstand the shock and vibration caused by frequent closing and closing. It is easy to install and fix, and it is suitable for the size of the standard cabinet.

Maintenance and convenient design

Indoor SF6 circuit breaker has extremely low maintenance in daily use, which is more suitable for indoor unattended scenarios.：

The vacuum arc extinguishing chamber is maintenance-free, and the performance of long-term use is not degraded.

SF6 gas seal is reliable, and the air pressure only needs to be checked briefly every day.

Modular structure, faster installation, commissioning, and replacement of parts.

In line with national standards and international standards, compatible with all kinds of switchgear.

Operating environment

Ambient temperature

Maximum temperature: +40℃

Minimum temperature: -15℃

Daily average value is not more than +35℃

Altitude: not more than 1000m

Daily average relative humidity: ≤95%

Monthly average relative humidity: ≤90%

Earthquake intensity: no more than 8 degrees

And places without dripping water, steam, flammable gas, fire, explosion danger, chemical corrosion and severe vibration.

Drawing

Product Specifications

Number	Parameter name	Unit	Technical Parameters
1	Rated voltage	kV	12
2	Rated short-time frequency withstand voltage (1 min)	kV	42
3	Rated lightning impulse withstand voltage (peak)	kV	75
4	Rated frequency	Hz	50
5	Rated current	A	630/1250/1600/2000/2500/3150/4000
6	Rated short-circuit breaking current	kA	20	25	31.5	40
7	Rated short-time withstand current	kA	20	25	31.5	40
8	Rated short circuit duration	S	4
9	Rated short-circuit closing current	kA	50	63	80	100
10	Rated peak withstand current	kA	50	63	80	100
11	Number of rated short-circuit current starts	times	30	30	30	20
12	Rated individual capacitor bank opening current	A	≤630
13	Rated back-to-back capacitor bank opening current	A	≤400
14	Rated capacitor bank closing inrush current	kA	12.5(frequency≤1000Hz)
15	Closing time	ms	≤80
16	Split time	ms	Maximum Voltage		≤40
		ms	Rated Voltage		≤50
		ms	Minimum Voltage		≤60
17	Time of ignition	ms	≤15
18	Mechanical life (M2)	times	30000
19	Allowable cumulative thickness of dynamic and static contact wear	mm	3
20	Rated closing operating voltage	V	AC/DC 220, AC/DC 110
21	Rated breaking operating voltage	V	AC/DC 220, AC/DC 110
22	Rated operating voltage of energy storage motor	V	AC/DC 220, AC/DC 110
23	Rated power of energy storage motor	W	80 (40KA Motor speed 100W)
24	Energy storage time	s	≤15
25	Contact opening distance	mm	9±1
26	Over traveling distance	mm	3.5±0.5
27	Contact closing bounce time	ms	≤2
28	Three-phase switching and closing non-synchronous	ms	≤2
29	Contact splitting rebound amplitude	mm	≤3
30	Contact closing contact pressure	kA	20	25	31.5	40
30	Contact closing contact pressure	N±8%	2200	2500	3100	4750
31	Average breaking speed (contacts separated by 6mm)	m/s	1.1±0.2
32	Average closing speed (6mm contact closure)	m/s	0.6±0.2
33	Dominant electric circuit resistance	A	630	1250	1600-2000	≥2500
34	Dominant electric circuit resistance	μΩ	≤50	≤45	≤35	≤25
34	Rated operating sequence (1) 20~31.5KA		Minutes - 0.3s - combined minutes - 180s - combined minutes
35	Rated sequence of operation (2) 40KA		Minutes - 0.3s - combined minutes - 180s - combined minutes
35	Secondary circuit frequency withstand voltage (1min)	V	2000