High - voltage pneumatic load break switch
Key attributes
| Brand | ROCKWILL |
| Model NO. | High - voltage pneumatic load break switch |
| Rated voltage | 12kV |
| Rated normal current | 630A |
| Rated frequency | 50/60Hz |
| Series | FKN |
Product descriptions from the supplier
Product Overview
The s high - voltage pneumatic load break switches and their combined electrical appliances are indoor high - voltage switchgear for AC 12kV, 50Hz. This load break switch features high specific technical parameters and reliable action. The basic form of the operating mechanism is manual spring - energy - storage type, and it can also be equipped with an electromagnetic spring operating mechanism. Based on the pneumatic arc - extinguishing principle, it can interrupt multiple times without replacing the arc - extinguishing tube.
The high - voltage load break switch can close, carry and open load currents under normal circuit conditions, and has the capability to close short - circuit currents and open short - circuit currents within a specified short time.
The load break switches can be equipped with earthing switches. The earthing switch has the same short - circuit making capacity as the load break switch, as well as the dynamic and thermal stability capability, and has a strict mechanical interlock with the load break switch, ensuring that misoperation is impossible in terms of structure.
Key Features
When the FKN12 - 12 load break switch is equipped with a high - voltage current - limiting fuse (with a striker) to form a load break switch - fuse combination, it serves as overload and short - circuit protection for loads (such as power transformers). When one or more phases of the fuse blow, the three phases of the load break switch automatically open.
The high - voltage load break switch is suitable for installation in ring - main unit switch cabinets and other types of switch cabinets for receiving and distributing electrical energy.
Technical Parameters
Serial No. |
Name |
Unit |
Value |
1 |
Rated Voltage |
KV |
12 |
2 |
Rated Frequency |
Hz |
50 |
3 |
Rated Current |
A |
630 |
4 |
Maximum Rated Current of Fuse |
A |
100 |
5 |
Rated Active Load Breaking Current, Rated Closed - loop Breaking Current |
A |
630 |
6 |
Rated Short - time Withstand Current (2S) |
KA |
20 |
7 |
Rated Short - circuit Making Current, Rated Peak Withstand Current |
KA |
50 |
8 |
1min Power Frequency Withstand Voltage, Phase - to - phase and to - ground / Break |
KV |
42/48 |
9 |
Lightning Impulse Withstand Voltage (Peak Value), Phase - to - phase and to - ground / Break |
KV |
75/85 |
10 |
Rated Cable Charging Breaking Current |
A |
10 |
11 |
Rated Breaking of No - load Transformer |
KVA |
1250 |
12 |
Mechanical Life |
Times |
2000 |
13 |
Rated Breaking Transfer Current |
A |
1150 |
14 |
Rated Short - circuit Breaking Current of Fuse |
KA |
31.5 |
Main Mechanical Characteristics of Load Break Switch
Serial No. |
Name |
Unit |
Value |
Remarks |
1 |
Phase - to - phase Center Distance |
mm |
210 ± 3 |
|
2 |
Total Stroke of Conductive Rod |
mm |
215 ± 5 |
|
3 |
Distance Between Moving and Static Arc at Opening Position |
mm |
>160 |
|
4 |
Over - stroke of Electrical Contact of Moving Contact Rod |
mm |
42 ± 3 |
|
5 |
Just - Closing Speed |
m/s |
3.8 <sup>+0.7</sup><sub>-0.2</sub> |
|
6 |
Just - Opening Speed |
m/s |
>2.7 |
|
7 |
Three - phase Closing Asynchronism |
ms |
>10 |
Contact between moving contact rod and contact fingers |
8 |
Three - phase Opening Asynchronism |
ms |
>5 |
Separation between moving contact rod and contact fingers |
Operating Environmental Conditions
Altitude: Not exceeding 1000m.
Ambient Temperature: Maximum +40°C, Minimum -10°C.
Relative Humidity: Daily average not exceeding 95%, Monthly average not exceeding 90%.
Seismic Intensity: Less than 8 degrees.
Related Products
Related Knowledges
-
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 -
How to Judge, Detect and Troubleshoot Transformer Core Faults1. Hazards, Causes, and Types of Multi-Point Grounding Faults in Transformer Cores1.1 Hazards of Multi-Point Grounding Faults in the CoreUnder normal operation, a transformer core must be grounded at only one point. During operation, alternating magnetic fields surround the windings. Due to electromagnetic induction, parasitic capacitances exist between the high-voltage and low-voltage windings, between the low-voltage winding and the core, and between the core and the tank. The energized windin01/27/2026 -
A Brief Discussion on the Selection of Grounding Transformers in Boost StationsA Brief Discussion on the Selection of Grounding Transformers in Boost StationsThe grounding transformer, commonly referred to as "grounding transformer," operates under the condition of being no-load during normal grid operation and overloaded during short-circuit faults. According to the difference in filling medium, common types can be divided into oil-immersed and dry-type; according to phase number, they can be classified into three-phase and single-phase grounding transformers. The groundi01/27/2026 -
Impact of DC Bias in Transformers at Renewable Energy Stations Near UHVDC Grounding ElectrodesImpact of DC Bias in Transformers at Renewable Energy Stations Near UHVDC Grounding ElectrodesWhen the grounding electrode of an Ultra-High-Voltage Direct Current (UHVDC) transmission system is located close to a renewable energy power station, the return current flowing through the earth can cause a rise in ground potential around the electrode area. This ground potential rise leads to a shift in the neutral-point potential of nearby power transformers, inducing DC bias (or DC offset) in their01/15/2026 -
HECI GCB for Generators – Fast SF6 Circuit Breaker1.Definition and Function1.1 Role of the Generator Circuit BreakerThe Generator Circuit Breaker (GCB) is a controllable disconnect point located between the generator and the step-up transformer, serving as an interface between the generator and the power grid. Its primary functions include isolating generator-side faults and enabling operational control during generator synchronization and grid connection. The operating principle of a GCB is not significantly different from that of a standard c01/06/2026
Related Solutions
-
Intelligent Operation Solution for 12kV Vacuum Circuit Breakers: Integrating Real-time Monitoring & Lifetime OptimizationⅠ. Equipment Operation & MaintenanceIntelligent Monitoring System IntegrationMulti-parameter Real-time Monitoring: Embedded sensors (temperature, displacement, Hall effect current sensors) track contact temperature rise, mechanical characteristics (opening/closing speed, overtravel), coil current, and partial discharge signals. Data undergoes preprocessing via edge computing prior to cloud upload.Lifetime Prediction Model: Dynamically evaluates remaining lifespan using electrical wear data06/10/2025 -
SF6 Circuit Breaker Solutions for Outdoor Installation (Anti-Pollution & Seismic Resistance)I.Core Challenges in Outdoor InstallationIn high-voltage transmission and distribution systems, SF6 circuit breakers are exposed to complex outdoor environments for extended periods, facing the following critical issues:Pollution & Insulation DegradationDust, salt fog, and industrial pollutants in outdoor environments easily adhere to equipment surfaces. In coastal or industrial areas, pollution levels may reach Class IV, resulting in insufficient creepage distance and triggering flasho05/12/2025 -
12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact Design12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact DesignⅠ. Executive SummarySoutheast Asia faces rapidly growing electricity demand alongside environmental challenges including high temperatures, humidity, salt spray corrosion, and grid instability. This solution recommends Solid Insulated Pole-Mounted Vacuum Circuit Breakers (VCB) featuring high reliability, compact design, and smart monitoring. Tailored for tropical climates and industrial scenarios, it06/10/2025
