Medium Voltage Fixed Seal 1250A Indoor Vacuum Circuit Breaker

Overview 

The VS1 indoor vacuum circuit breaker, designed for 12kV electrical systems, is an essential component for indoor applications. This breaker is extensively utilized in various settings, including utility grids, industrial and mining operations, power generation facilities, and substations. It plays a crucial role in managing and safeguarding electrical infrastructure such as cables, overhead lines, distribution stations, motors, transformers, generators, and capacitors. Its design caters specifically to scenarios that demand frequent operational cycles or the interruption of short circuit currents multiple times.

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Environmental Conditions

Normal service condition

• Ambient temperature  Maximum temperature: +40 ° C  Minimum temperature: -25 ° C

• Ambient humidity Daily mean relative humidity: ≤95% Monthly mean relative humidity: ≤ 90%

• Altitude: No more than 1000m The intensity of the earthquake  was not more than 8 degrees

• The use place is free from dripping water, flammable and explosive danger, chemical  corrosive gas and violent vibration

Special service conditions

• For special use conditions, by the manufacturer and the user to negotiate, and reached a consensus, to  provide special design and supply;

• Special conditions of use are:

   ① The altitude above 1000m;

   ②Places with condensation risk under high humidity or climate conditions with large humidity mutation.

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Product Features

• Efficient Arc-Quenching Performance: Incorporates cutting-edge vacuum arc-quenching technology to swiftly interrupt fault currents, significantly mitigating the thermal and electromagnetic impact on the equipment.

• Superior Insulation Performance: The use of premium insulation materials and sophisticated design ensures outstanding insulation performance, even under high-voltage conditions, thereby preventing electrical faults.

• Durability and Low Maintenance: The vacuum arc-quenching chamber's design minimizes maintenance needs while providing a mechanical lifespan exceeding 100,000 operations, guaranteeing enduring performance.

• Compact and Versatile Design: Its compact structure coupled with versatile installation options enables flexible placement in diverse environments, catering to a broad range of user requirements.

• Smart Control Capabilities: Offers optional smart control units for remote management, real-time status monitoring, and fault diagnosis, enhancing the operational intelligence of electrical grids.

• Robust Environmental Adaptability: Engineered to withstand various environmental challenges, including extreme temperatures, humidity, and vibration, ensuring reliable function in adverse conditions.

• Energy Efficiency and Eco-friendliness: The breaker's high-efficiency arc-quenching mechanism and energy-conservative design contribute to reduced power system consumption and operational costs, supporting sustainability goals.

Technical Data

NO.	Project	Unit	Numerical value
1	Rated voltage	kV	12
2	Rated short-time power frequency withstand voltage(1min)		42
3	Rated lightning shock tolerance voltage (peak)		75
4	Rated frequency	Hz	50
5	Rated current	A	630 1250	630 1250 1600 2000 2500 3150		1250 1600 2000 2500 3150 4000
6	Rated short-circuit breaking current	kA	20/25	31.5		40
7	Rated short-time withstand current		20/25	31.5		40
8	Rated short circuit duration	S	4
9	Rated peak tolerable current	kA	50/63	80		100
10	Rated short-circuit closing current		50/63	80		100
11	Secondary circuit power frequency withstand voltage (1min)	V	2000
12	Rated single/back-to-back capacitor group breaking current	A	630/400(800/400 for 40kA)
13	Rated capacitor bank turn-on inrush current	kA	12.5(Frequency not more than 100Hz)
14	Switching time (rated voltage)	ms	≤50
15	Closing time(rated voltage)		≤60
16	Mechanical life	Time	20000
17	Breaking times of rated current (electrical life)		20000
18	Number of breaks of rated short circuit current		50(40kA≤30)
19	Kinematic and static contacts allow wear accumulative thickness	mm	3
20	Rated closing operating voltage	V	AC110/220 DC110/220
21	Rated switching operating voltage
22	Rated voltage of energy storage motor
23	Rated power of energy storage motor	W	70
24	Energy storage time	S	≤10
25	Contact opening distance	mm	11±1
26	Overstroke		3.5±0.5
27	Contact closing bounce time	Ms	≤2(40kA≤3)
28	Three -phase switching and closing are different		≤2
29	Average opening speed	m/s	1.1±0.2
30	Average closing speed		0.6±0.2
31	Main circuit resistance (fixed/hand)	μΩ	≤45/60(630A)≤40/55(1250A) ≤30/50(1600-2000A)≤25/35(More than 2500A)
32	Contact closing contact pressure	N	2000±200(20kA)2400±200(25kA) 3100±200(31.5kA)4250±250(40kA)
33	Rated operation sequence		Opening -0.3s(18OS)-Opening and closing 180S-Opening and closing

Schematic diagram of structure

Outline dimensional drawing

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