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 |
Check SF6 pressure and moisture annually; inspect the three-position mechanism every 5 years; the vacuum interrupter has no regular maintenance. It supports remote monitoring of pressure and partial discharge to realize predictive maintenance
It is suitable for 35kV1250A GIS switchgear in substations, industrial power distribution, railway traction power supply, and critical loads such as data centers, which requires high reliability and frequent operation
It integrates three functions in one: closing (carrying/breaking current), isolating (safe maintenance isolation), and earthing (equipment safety earthing), with mechanical interlocking to prevent misoperation, which is more integrated and reliable than separate switches
Related Products
-
RNV-B1-12 GIS Sf6 Break Switch Circuit Breaker for Gas Insulated Switchgear
-
RNN-12 630A SF6 Gas Insulated Load Isolation Switch
-
RNN-12 SF6 Gas Insulated Load Isolation Switch (with Grounding)
-
RNV-A1-12D-1250A SF6 High Voltage Gas Insulated Inflatable Cabinet Circuit Breaker
-
24kV GIS Sf6 Break Switch Circuit Breaker for Gas Insulated Switchgear
-
24kV SF6 gas insulated load isolation switch (three position with isolation)
-
40.5kV Manual Operation Mechanism for Spring-Loaded Inlet of SF6 Gas-Insulated Switchgear
Related Knowledges
-
Faults and Handling of Single-phase Grounding in 10kV Distribution LinesCharacteristics and Detection Devices for Single-Phase Ground Faults1. Characteristics of Single-Phase Ground FaultsCentral Alarm Signals:The warning bell rings, and the indicator lamp labeled “Ground Fault on [X] kV Bus Section [Y]” illuminates. In systems with a Petersen coil (arc suppression coil) grounding the neutral point, the “Petersen Coil Operated” indicator also lights up.Insulation Monitoring Voltmeter Indications:The voltage of the faulted phase decreases (in01/30/2026 -
Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026 -
What’s the Difference Between Rectifier Transformers and Power Transformers?What is a Rectifier Transformer?"Power conversion" is a general term encompassing rectification, inversion, and frequency conversion, with rectification being the most widely used among them. Rectifier equipment converts input AC power into DC output through rectification and filtering. A rectifier transformer serves as the power supply transformer for such rectifier equipment. In industrial applications, most DC power supplies are obtained by combining a rectifier transformer with rectifier equ01/29/2026
