40.5kV/1250A-31.5kA THREE-POSITION GIS VCB(Vacuum circuit breaker)
Key attributes
| Brand | Switchgear parts |
| Model NO. | 40.5kV/1250A-31.5kA THREE-POSITION GIS VCB(Vacuum circuit breaker) |
| Rated voltage | 40.5kV |
| Rated normal current | 1250A |
| Rated short circuit breaking current | 31.5kA |
| Series | RNGIS-40.5 |
Product descriptions from the supplier
This 40.5kV vacuum circuit breaker (VCB) is tailored for gas-insulated switchgear (GIS) systems, integrating three-position functionality (breaking, isolating, and grounding) to streamline high-voltage power control. It supports a rated current of 1250A and a breaking capacity of 31.5kA, ensuring reliable protection against short circuits and overcurrents in medium-to-high voltage grids.
Adopting modular design, it is characterized by compact structure, good breaking performance, high reliability, long service life, complete isolation, maintenance free, small footprint, and can be widely used in industrial and civilian ring networks and terminal power supply networks. Especially suitable for small secondary distribution stations, switch stations, industrial and mining enterprises, airports, railways, highways, subways, commercial areas, residential areas, wind power, optoelectronics and other fields.
Operating conditions
Parameter |
Specification |
installation site |
In the box |
ambient temperature (℃) |
-45~+140 |
height (m) |
≤2000 |
air humidity (%) |
The daily average is not greater than 95% and the monthly average is not greater than 90% |
seismic intensity |
No more than 8 degrees |
Technical parameters of circuit breaker
| order number | Main equipment and technical performance |
Parameters and requirements |
|---|---|---|
| 1 |
circuit breaker | 1 unit |
| type | Fixed vacuum circuit breaker | |
| rated voltage | 40.5kV | |
| rated current | 1250A | |
| rated frequency | 50Hz | |
| Peak lightning impulse withstand voltage (breakout/ground) | ≥215kV/185kV | |
| 1min power frequency withstand voltage (breakout/ground) | ≥118kV/95kV | |
| Rated short-time power frequency withstand voltage of auxiliary circuit | 2kV、50HZ 1min | |
| Rated short-term withstand current | 20kA | |
| Rated peak withstand current | 50kA | |
| Rated short circuit breaking current | 20kA | |
| Rated short-circuit closing current | 50kA | |
| Rated short circuit duration | ≥4s | |
| Operating mechanism - type | Spring operating mechanism | |
| Operating mechanism - control voltage | DC 24V/(48V/110V/220V) | |
| Operating mechanism - Auxiliary contacts | 6 always on, 6 always off | |
| mechanical life - Rated operating sequence | O-0.3s-CO-180s-CO | |
| mechanical life - mechanical life | 10,000 times | |
| Electrical life | 10,000 times | |
| mechanical properties - Closing and opening time | 35-70ms | |
| mechanical properties - Comb and split speed | 1.2-1.9mm/s | |
| mechanical properties - clearance between open contacts | 18-22mm | |
| mechanical properties - Three-phase coincidence and different phase separation | ≤3ms | |
| 2 |
Three position isolating switch | 1 unit |
| type | Manual/ Electric | |
| Auxiliary contacts | 3 always on, 3 always off | |
| 3 |
mechanical life | 2,000 times |
| Electrical life of grounding switch | 2,000 times | |
| 4 | Cabinet dimensions | Not larger than 600X1700 (width X depth) |
Mechanical characteristics of circuit breaker
| order number | inspecting item | technical requirement |
|---|---|---|
| 1 |
Check the main switch of the circuit breaker |
Number of arc extinguishing chamber (indicate manufacturer) |
| The opening distance is 18-22mm | ||
| Exceeding the limit by 3±1mm | ||
| Contact pressure ≥ 3000N | ||
| 2 | Mechanical properties inspection | The difference between three-phase phase separation is less than 2ms |
| The difference between three-phase closing time is less than 2ms | ||
| Average speed of commutation 1.4-2.0m/s | ||
| Average closing speed 1.0-1.8m/s | ||
| 3 | Circuit breaker circuit | Loop resistance ≤ 45μΩ |
Online store
On-time delivery rate
Response time
100.0%
≤4h
Company overview
Workplace: 1000m²
Total staff:
Highest Annual Export(usD): 300000000
Services
Business Type: Sales
Main Categories: Low Voltage Electrical Apparatus/Instrument meters/Tester/High Voltage Electrical Apparatus/Production equipment/Electrical fittings/Equipment Parts
Whole life care manager
Whole-life care management services for equipment procurement, use, maintenance, and after-sales, ensuring safe operation of electrical equipment, continuous control, and worry-free electricity consumption.
The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.
Related Products
Related Knowledges
-
Analysis and Remedial Measures for Insulation Failures in Power TransformersThe Most Widely Used Power Transformers: Oil-Immersed and Dry-Type Resin TransformersThe two most widely used power transformers today are oil-immersed transformers and dry-type resin transformers. The insulation system of a power transformer, composed of various insulating materials, is fundamental to its proper operation. A transformer's service life is primarily determined by the lifespan of its insulating materials (oil-paper or resin).In practice, most transformer failures result from damag12/16/2025 -
Case Studies of Installation and Manufacturing Defects in 110kV HV Circuit Breaker Porcelain Insulators1. SF6 gas leakage occurred in the ABB LTB 72 D1 72.5 kV circuit breaker.Inspection revealed gas leakage at the fixed contact and cover plate area. This was caused by improper or careless assembly, where the dual O-rings slipped and were misplaced, resulting in gas leakage over time.2. Manufacturing Defects on the Outer Surface of 110kV Circuit Breaker Porcelain InsulatorsAlthough high-voltage circuit breakers typically have their porcelain insulators protected with covering materials during tra12/16/2025 -
Overview of Defect Diagnosis Methods for High-Voltage AC Circuit Breakers1. What are the characteristic parameters of the coil current waveform in high-voltage circuit breaker operating mechanisms? How to extract these characteristic parameters from the original trip coil current signal?Answer: The characteristic parameters of the coil current waveform in high-voltage circuit breaker operating mechanisms may include the following: Steady-state peak current: The maximum steady-state current value in the electromagnet coil waveform, representing the position where the12/16/2025 -
Intelligent Substation Maintenance Pressure Plate Operation GuideAccording to the "Eighteen Major Anti-Accident Measures for Power Grid of State Grid Corporation of China (Revised Edition)" promulgated in 2018, operation and maintenance units should improve the on-site operation regulations for intelligent substations, refine the usage instructions and abnormal handling methods for various messages, signals, hard pressure plates, and soft pressure plates of intelligent equipment, standardize the operation sequence of pressure plates, strictly follow the seque12/15/2025 -
Classification of Equipment Defects for Relay Protection and Safety Automatic Devices in SubstationsIn daily operations, various equipment defects are inevitably encountered. Whether maintenance personnel, operation and maintenance staff, or specialized management personnel, all must understand the defect classification system and adopt appropriate measures according to different situations.According to Q/GDW 11024-2013 "Operation and Management Guide for Relay Protection and Safety Automatic Devices in Smart Substations," equipment defects are classified into three levels based on severity an12/15/2025 -
Under What Conditions Will the Line Circuit Breaker Auto-Reclosing Signal Be Locked Out?The line circuit breaker auto-reclosing signal will be locked out if any of the following conditions occur:(1) Low SF6 gas pressure in circuit breaker chamber at 0.5MPa(2) Insufficient energy storage in circuit breaker operating mechanism or low oil pressure at 30MPa(3) Busbar protection operation(4) Circuit breaker failure protection operation(5) Line distance protection zone II or zone III operation(6) Short lead protection operation of circuit breaker(7) Presence of remote tripping signal(8)12/15/2025
Haven't found the right supplier yet? Let matching verified suppliers find you.
Get Quotation Now
Send inquiry
Download
Get the IEE Business Application
Use the IEE-Business app to find equipment, obtain solutions, connect with experts, and participate in industry collaboration anytime, anywhere—fully supporting the development of your power projects and business.
