Product Overview
KYN28 metal-clad withdrawable switchgear is designed for indoor 50 Hz power distribution systems, with a rated voltage of 12 kV and rated current options of 630 A or 1,250 A. It provides switching, control and protection for incoming supplies, outgoing feeders and transformer circuits in industrial plants, substations and infrastructure facilities.
A withdrawable vacuum circuit breaker supports inspection, testing and servicing, while separate busbar, circuit-breaker, cable and low-voltage compartments provide an organized internal layout. Cabinet functions, protection devices and control arrangements can be selected to suit the project’s single-line diagram and operating requirements.
Key Features
Withdrawable vacuum circuit breaker for testing and servicing
Separate compartments for primary equipment and secondary controls
Mechanical and electrical interlocks to help prevent incorrect operation
Rated short-time withstand current of 31.5 kA for 4 seconds
IP4X enclosure protection for indoor installation
Technical Specifications
| Parameter | Unit | Specification |
|---|---|---|
| Model | — | KYN28 |
| Product type | — | Metal-clad withdrawable switchgear |
| Installation location | — | Indoor |
| Rated voltage | kV | 12 |
| Circuit-breaker rated current | A | 630 / 1,250 |
| Switchgear rated current | A | 630 / 1,250 |
| Rated frequency | Hz | 50 |
| Rated short-time withstand current | kA | 31.5 |
| Rated short-circuit duration | s | 4 |
| Rated peak withstand current | kA | 80 |
| 1-minute power-frequency withstand voltage — phase-to-phase and phase-to-earth | kV | 42 |
| 1-minute power-frequency withstand voltage — across the isolating distance | kV | 48 |
| Lightning impulse withstand voltage — phase-to-phase and phase-to-earth | kV | 75 |
| Lightning impulse withstand voltage — across the isolating distance | kV | 85 |
| Enclosure protection rating | — | IP4X |
| Circuit-breaker type | — | Vacuum circuit breaker |
| Circuit-breaker arrangement | — | Withdrawable truck |
Rated short-circuit breaking and making currents will be confirmed against the selected circuit breaker. Final equipment ratings, cabinet dimensions and protection arrangements are subject to the approved project documentation.
Product Advantages
Withdrawable Circuit Breaker for Convenient Servicing
The vacuum circuit breaker is mounted on a withdrawable truck, allowing it to be moved between defined service and test or disconnected positions. This arrangement supports functional testing and removal for maintenance after the required isolation and safety procedures have been completed.
Separate Compartments for Organized Access
Dedicated busbar, circuit-breaker, cable and low-voltage compartments separate the main functional areas. Protection relays, instruments and control devices are located in the low-voltage compartment, providing an organized arrangement for secondary wiring and routine checks.
Interlocks to Support Correct Operation
Mechanical and electrical interlocks help control the operating sequence between the circuit breaker, withdrawable truck and earthing switch. These mechanisms help prevent incompatible operations, such as moving the truck while the circuit breaker is closed. The final interlocking scheme is confirmed for the selected configuration.
Vacuum Circuit Breaker Technology
A vacuum circuit breaker provides the switching and fault-interruption function for the selected circuit. Breaker selection takes account of load current, system fault levels, operating duty and protection requirements, with maintenance carried out according to the manufacturer’s instructions.
Flexible Cabinet Functions
Incoming, outgoing, bus-section, metering and voltage-transformer functions can be incorporated into the switchgear lineup according to the approved design. This allows the cabinet arrangement to follow the project’s distribution scheme and control requirements.
Defined Electrical Ratings for Project Selection
A short-time withstand rating of 31.5 kA for 4 seconds and a peak withstand rating of 80 kA provide clear reference values for system design. The specified power-frequency and lightning impulse withstand levels also support insulation selection for the installation.
Typical Applications
Industrial Plants and Workshops
Incoming supply and feeder distribution for steelworks, petrochemical facilities, cement plants and manufacturing sites. Transformer feeders supply downstream transformers serving production equipment and building services.
Substations and Power Facilities
Switching, control and protection for suitable medium-voltage distribution circuits and plant auxiliary systems, where the equipment ratings match the project requirements.
Commercial Buildings and Public Facilities
Medium-voltage incoming and transformer-feeder circuits for office complexes, shopping centres, hospitals, airports and sports venues. Supply continuity depends on the overall distribution, backup and protection design.
Transport and Infrastructure
Distribution circuits in railway and metro auxiliary substations, ports and water infrastructure, subject to the required electrical ratings and site conditions.
Discuss Your KYN28 Switchgear Requirements
Send us your single-line diagram, equipment schedule or project specifications so we can review a suitable switchgear arrangement.
For an initial enquiry, please provide:
- Nominal system voltage and required equipment rated voltage
- Rated frequency and incoming or outgoing circuit currents
- Prospective short-circuit current and required withstand duration
- Required cabinet functions and number of panels
- Protection, metering and control requirements
- Cable sizes, quantities and entry arrangements
- Installation layout, altitude and ambient conditions
- Preferred circuit-breaker and protection-relay brands, if applicable
Final cabinet dimensions, component selection, interlocking arrangements and accessories will be confirmed against the project requirements.
Request a Quote
Share your project requirements for configuration review.
