12kV indoor high-voltage load break switch
Key attributes
| Brand | ROCKWILL |
| Model NO. | 12kV indoor high-voltage load break switch |
| Rated voltage | 12kV |
| Rated normal current | 400A |
| Rated frequency | 50/60Hz |
| Series | FN |
Product descriptions from the supplier
Product Overview
The FN5 - 12 indoor AC high - voltage load break switch (hereinafter referred to as the load break switch) is suitable for AC 50Hz, 12kV networks. It is used for breaking load current and closing short - circuit current. The load break switch with a fuse can cut off short - circuit current and be used as a protection switch.
This load break switch can be equipped with the CS6 - 1 manual operating mechanism and the special CS manual operating mechanism for this product.
Key Features
Precise Current Control：Suitable for 12kV, 50Hz AC systems. It can stably break load current and close short - circuit current, ensuring normal operation and maintenance of the power grid as well as emergency operations during faults.
Extended Protection Function：When paired with a fuse, it can cut off short - circuit current and act as a protection switch, providing overload and short - circuit dual protection for power equipment and simplifying the protection levels of the distribution network.
Wide Scene Adaptability：Focused on indoor 12kV AC networks. It is suitable for typical indoor power distribution scenarios such as ring main units and box - type substations, meeting the needs of distribution network construction.
Flexible Mechanism Configuration：Supports the CS6 - 1 general manual operating mechanism and can also be adapted to the special CS mechanism, compatible with different operating habits and equipment matching requirements.
Mature Technical Architecture：Iterated based on the classic FN5 - 12 model. It has a compact structure, stable arc - extinguishing performance, high long - term operation reliability, and reduces operation and maintenance costs.
Technical Parameters
Name |
Unit |
Value |
Rated Voltage |
kV |
12 |
Maximum Operating Voltage |
kV |
12 |
Rated Frequency |
Hz |
50 |
Name |
Unit |
Value |
|
Rated Current |
A |
400 |
630 |
Rated Short - time Withstand Current (Thermal Stable Current) |
kA/S |
12.5/4 |
20/2 |
Rated Peak Withstand Current (Dynamic Stable Current) |
kA |
31.5 |
50 |
Rated Closed - loop Breaking Current |
A |
400 |
630 |
Rated Active Load Breaking Current |
A |
400 |
630 |
5% Rated Active Load Breaking Current |
A |
20 |
31.5 |
Rated Cable Charging Breaking Current |
A |
10 |
|
Rated No - load Transformer Breaking Current |
No - load Current of 1250kVA Transformer |
||
Rated Short - circuit Making Current |
kA |
31.5 |
50 |
Load Current Breaking Times |
Load/Time |
100%/20 |
30%/75 |
1min Power Frequency Withstand Voltage (Effective Value, to Ground, Phase - to - Phase/Isolation Break) |
kV |
42/48 |
|
Power Frequency Withstand Voltage, Between Isolation Breaks |
kV |
53 |
|
Lightning Impulse Withstand Voltage (Peak Value, to Ground, Phase - to - Phase/Isolation Break) |
kV |
75/85 |
|
Opening and Closing Operating Torque (Force) |
N·m (N) |
90(80) |
100(200) |
Technical Parameters of Fuse
Model |
Rated Voltage (kV) |
Rated Current of Fuse (A) |
Rated Breaking Current (kA) |
Rated Current of Fuse Element (A) |
RN3
|
12
|
50 |
12.5 |
2, 3, 5, 7.5, 12, 15, 20, 30, 40, 50 |
75 |
12.5 |
75 |
||
100 |
12.5 |
100 |
||
200 |
12.5 |
150, 200 |
||
SDL*J |
12 |
40 |
50 |
6.3, 10, 16, 20, 25, 31.5, 40 |
SFL*J |
12 |
100 |
50 |
50, 63, 71, 80, 100 |
SKL*J |
12 |
126 |
50 |
125 |
Operating Environmental Conditions
Altitude: Not exceeding 1000m;
Ambient Air Temperature: Upper limit +40°C, Lower limit -25°C (Not lower than -5°C for motor - operated mechanisms);
Relative Humidity: Daily average not greater than 95%, Monthly average not greater than 90% (+25°C);
Ambient air should be free from obvious pollution by corrosive or flammable gases, water vapor, etc.;
No frequent severe vibration.
Related Products
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
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
