KYN Removable AC Metal Clad Switchgear
KYN28-24(Z) series alternating-current metal-clad and metal-enclosed with drawable switchgear(hereinafter referred to as “switchgear”) is a complete set of power distribution unit of three-phasesingle bus and single bus section system of 20kV and AC50(60)Hz.
This switchgear is mainly applicable to power plants, power transmitting of middle and small sized generators,distribution of industrial and mining enterprises, electricity receiving and transmitting of secondary substations,as well as starting of large high-voltage motors, etc, realizes control protection and monitoring.
KYN28-24(Z) series AC metal-clad and metal-enclosed withdrawable switchgear is a complete power distribution unit for three-phase single-bus and single bus-section systems at 20 kV and AC 50/60 Hz. The vacuum circuit breaker rides a mid-mounted truck that rolls between operating, test, and withdrawn positions inside grounded metal-clad compartments — a breaker is serviced or replaced without opening busbar connections or adjacent panels.
We deliver KYN28-type panels to your one-line diagram — breaker ratings, relay protection, and interlock schemes configured per project, with routine tests and documentation completed before shipment. The work draws on fifteen years and 4,000+ industrial projects of assembly experience, including CNC-fabricated frames and in-house secondary wiring.
Technical Parameters
| No | Item | Unit | Parameter | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | Rated voltage | KV | 24 | ||||||
| 2 | Rated frequency | Hz | 50 / 60 | ||||||
| 3 | Rated insulation level | 1Min. frequency tolerance | KV | Interphases | 65 | Isolated fracture | 79 | ||
| Lightning impulse tolerance voltage | 125 | 145 | |||||||
| Auxiliary control voltage | V | 2000 | |||||||
| 4 | Rated current | A | 630, 1250, 1600, 2000, 2500, 3150 | ||||||
| 5 | Rated short circuit breaking current | KA | |||||||
| 6 | Rated short circuit closing current (Peak) | KA | |||||||
| 7 | Rated short time withstand current 4s | KA | |||||||
| 8 | Rated peak endurance current | KA | |||||||
| 9 | Auxiliary control circuit rated voltage | V | |||||||
| 10 | Protective level | IP4X (Doors of compartments are open, the degree is up to IP2X) | |||||||
| 11 | Outline dimensions (W x D x P) | mm | 800x1800x2300; 1000x1800x2300 | ||||||
| 12 | Total weight | Kg | 750 ~ 1440 | ||||||
Model explanantion
Feature of Removable AC Metal Clad Switchgear
- The busbar adopts heat-shrinkable insulating material or epoxy-coated insulating means to optimize the electrode shape so that the cabinet structure is compact and the floor space is reduced.
- The cabinet is made of high-quality cold-rolled steel plates and imported aluminum-zinc coated plates, which are formed by CNC sheet metal processing and are connected by high-strength bolts, nuts, and rivet nuts.
- Insulation boards are installed in the busbar room, handcart room, and cable room in the cabinet, and the insulation level is greatly improved.
- Can be configured with domestic VS1-24 vacuum circuit breaker or Schneider’s VH4 or Alstom FP series sulfur hexafluoride circuit breaker to meet the needs of different users.
- The combined valve can be opened flexibly. As the circuit breaker is pulled out, the valve will be automatically closed and forced to lock, preventing the danger of accidentally touching high voltage.
- The friendly man-machine interface makes the operation of the switch cabinet programmatic and formulaic, and the operator can see it at a glance.
- The main wiring scheme can reach more than 160 kinds, and the structure has strong adaptability, which can meet the needs of different users
Removable AC Metal Clad Switchgear Structure
Key Specifications & Options
The configuration below reflects the options we build to order for KYN28-24(Z) removable AC metal-clad switchgear. Every parameter can be adjusted to match your drawings and site conditions — send us your requirements and our engineers will confirm what applies to your project.
| Parameter | Options / Typical Range |
|---|---|
| Rated voltage | 24 kV class applied on 20 kV systems (per series design) |
| System arrangement | Three-phase single-bus and single bus-section systems, AC 50/60 Hz |
| Circuit breaker | Vacuum breakers on a removable mid-mounted truck |
| Construction | Metal-clad: breaker truck, busbar, cable, and low-voltage compartments separated by grounded metal partitions |
| Interlocking | Mechanical interlocks enforcing truck positions and earthing sequences against mal-operation |
| Protection degree | IP4X typical for the enclosure, IP2X between compartments |
| Applicable standards | GB 3906 for MV metal-enclosed switchgear, corresponding to IEC 62271-200 |
| Typical applications | Power plant and substation MV distribution, industrial intake and ring feeds, transformer protection |
Frequently Asked Questions
What is the difference between metal-clad and metal-enclosed switchgear?
Metal-clad is the stricter construction — main circuit components sit in individual grounded metal compartments and the interrupter is a removable element, while metal-enclosed is the broader term for any earthed metal housing. Our comparison guide walks the definitions and what they mean for maintenance and standards.
Why choose a removable (drawout) breaker at medium voltage?
Because the breaker truck is the maintenance item: rolling it to the disconnected position isolates it without touching busbars, a spare truck restores the panel quickly, and breakers can be serviced off-line. Plants that cannot tolerate long MV outages standardize on drawout designs.
How does GB 3906 relate to IEC 62271-200?
GB 3906 is the Chinese national standard for AC metal-enclosed switchgear above 1 kV and corresponds to IEC 62271-200 — rated characteristics, construction, and testing requirements align between them. We design KYN28 panels to this framework and reference the IEC standards for export projects.
Can panels be arranged for bus-section and transformer feeder duty?
Yes — incoming, outgoing, bus-section, metering, and transformer protection panels are configured from the same truck platform per your one-line diagram, with interlocking between coupled panels where the scheme requires it.
Related Guides
- Metal-Enclosed vs Metal-Clad Switchgear: How to Compare the Terms — the construction terms behind this panel family
- Medium-Voltage-Switchgear Guide: Functions, Components, and Selection Inputs — the MV switchgear landscape
- Metal Enclosed Switchgear: A Comprehensive Guide — a deeper guide to enclosed constructions
- Fixed AC Metal Enclosed Switchgear (XGN15-12) — the fixed-type alternative for ring and terminal duty
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