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11KV Load Break Switch for Medium Voltage Ring Main Unit
The KDK-12D/800-20 series 11KV Load Break Switch For Medium Voltage Ring Main Unit are important products of Cotenele company,these load break switch complies with the requirements of relevant standards and specifications such as GB3804-2017 "3.6kV~40.5kV High Voltage AC Load Switches", GB16926-2009 "AC High Voltage Load Switches - One Fuse Combination Apparatus", and GB/T1985-2023 "High Voltage AC Isolation Switches and Grounding Switches". The main circuit's short-term withstand current should meet 20kA (4s) and 25kA (3s), and the mechanical life of the load switch should be 5000 times. The short-term withstand current of the grounding switch meets 20kA (4s), and the mechanical life is 3000 times.
The 11kV Load Break Switch for Medium Voltage Ring Main Unit is a core component designed for the safe control of electrical energy flow. Located between the disconnector and the circuit breaker, it is ideal for Type C load break ring networks and can be used with medium-voltage fuses in Type F ring networks to ensure reliable protection and operation.
This switch supports systems from 6kV to 40.5kV and is suitable for industrial, municipal, renewable energy, and commercial distribution networks.
Model and meanings
| KD | K | 12 | D | 800 | 20 |
|
Company code |
Load break switch |
Rated voltage |
Earthing Type |
Rated current |
Rated Short-time withstand current |
Product Applications
The 11KV Load Break Switch For Medium Voltage Ring Main Unit is the core component in Ring Main Units . These units such as HXGN15-12, HXGN15-40.5 are extensively deployed in secondary power distribution systems. The primary applications of ring main unit include:
Transformer Protection: Switching and protecting distribution transformers (typically up to 1250/1600 kVA) in a compact, economical manner.
Cable Loop Switching: Create and manage a circular network connection that isolates cable segments for maintenance without interrupting the power supply to the entire loop.
Industrial and Commercial Power Centers: Serving as the main switching and protection point for power entrances in factories, apartment complexes, and commercial buildings.
Product Characteristics
Load break switches are defined by a set of distinct design and functional characteristics:
Load Current Handling
Possesses a dedicated arc-quenching system (which may be air, gas, vacuum, or SF6-based) that enables the safe closing and opening of normal load currents and specified overload currents.
Lack of Short-Circuit Breaking Capacity
Inherently designed not to interrupt short-circuit fault currents. This critical function is achieved by an associated fuse.
Visible Break Isolation
Construction of the load break switch has a visible and unambiguous isolation gap when in the open position, which can ensure the safety of maintenance personnel working on the downstream circuit.
Diverse Arc-Quenching Media
For meeting the different environmental requirement and performance needs, the load break switch can provide various of technologiesshch as air or puffer type which Uses compressed air to extinguish the arc and vacuum type which employs a vacuum interrupter for superior arc extinction in a sealed chamber.
SF6 Gas Type
Uses sulfur hexafluoride gas for excellent insulation and arc-quenching properties.
Compact and Integrated Design: Its structure allows for a small footprint, especially when combined with fuses into a single functional unit within an RMU enclosure.
Product Advantages
In medium-voltage ring main units (RMS), load break switches are typically used in combination with fuses. In this typical application, the 11kV Load Break Switch for Medium Voltage Ring Main Unit offers significant advantages over using circuit breakers:
Significant Economic Efficiency
The "load switch + fuse" combination is a highly cost-effective solution for the protection of standard distribution transformers, their manufacturing and installation costs are significantly lower than those of a circuit breaker-based RMU, and they can provide substantial savings in project budgets without compromising on basic functionality.
Superior Protection Characteristics
The speed of intervention is critical to prevent the event of an internal transformer fault,, such as tank rupture. A medium-voltage fuse can clear a fault within the first 10 milliseconds, which is often faster than a circuit breaker's operating time (typically around 60ms). This response speed enhanced protection for the transformer. Furthermore, this combination of the load break switch and fuse simplifies coordination in ring networks, and the coordination from circuit breakers can be challenging to achieve.
Technical Parameters
| SN | Content | Unit |
Technical Porameter |
| 1 | Rated Frequency | HZ | 50 |
| 2 | Rated Current | A | 800 |
| 3 | Rated short-time withand current | KA | 20/25 |
| 4 | Rated short-circuit duration | S | 4 |
| 5 | Rated short-circuit making current | KA | 50 |
Appearance and Dimension
FAQ
Q1:What is an 11kV Load Break Switch for Medium Voltage Ring Main Unit?
A: The 11kV Load Break Switch for Medium Voltage Ring Main Unit is a core switching device in a medium-voltage power distribution system. It is used to safely connect or disconnect current loads and is typically installed within a Ring Main Unit (RMU). Located between a simple disconnector and a complex circuit breaker, it can withstand normal loads and overload currents, but it cannot directly interrupt short-circuit fault currents. Short-circuit protection is usually achieved by fuses or circuit breakers.
Q2:What is your usual delivery time?
A: This depends on the specific quantity of your order, usually within 15 working days. If your order needs are urgent, we can discuss it.
Q3:What payment method are you willing to accept?
A: Our usual payment method is a 30% down payment, with the remaining 70% paid in full before shipment. We usually quote based on EXW method. If you have other requirements, we can also communicate.
Q4:Can you guarantee that the goods will not be damaged during long-distance sea transportation?
A:In generally, we will use professional packaging to ensure 'shock resistance' and transportation insurance to provide a 'safety net'.
About packaging: All our cargos will be packed in "sea worthy export standard packaging", these packing methods such as using thickened foam/bubble column inside the package box, using high-quality export grade corrugated boxes/wooden shelves/pallets outside the package. These packaging methods have undergone long-term testing and practical transportation verification, and can effectively cope with normal bumps, stacking pressure, and humid environments during sea transportation.
Regarding insurance: Although our packaging can minimize the risk of damage to the greatest extent possible, due to the long international transportation chain, there are some unforeseeable factors (such as extreme weather, rough handling, etc.). In order to provide 100% protection for your goods, we strongly recommend that you purchase cargo transportation insurance, or we can act on your behalf. Once damage caused by transportation occurs, you can claim compensation from the insurance company based on the insurance documents, which is currently the most common practice in international trade.
Our Workshop
Our After-Sales Service Commitment
1. Technical Support & Free Training
We provide remote online video guidance and free training for your technical staff. All maintenance is free within the first year of operation. After one year, paid maintenance services remain available.
2. Quick Response
Your requests are important to us. We will respond via email or phone within one hour to ensure your needs are addressed promptly.
3. Lifetime Consultation
We offer ongoing consultation services for the lifetime of your equipment. Our team is always ready to answer any questions you may have.
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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