KYN28A-12 Removable AC Metal-Clad Switchgear (12kV)

KYN28A-12 12kV metal-clad withdrawable switchgear, 630–4000A rated current, 20–50kA/4s short-time withstand, 50–125kA peak withstand, IP4X enclosure. Equipped with VS1 (ZN63A) or VD4 vacuum circuit breakers. IEC 62271-200 & GB3906 compliant. Five-prevention interlocking for operator safety.

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Product Description

KYN28A-12 Removable AC Metal-Clad Switchgear (12kV)

Raydafon KYN28A-12 is a removable AC metal-clad switchgear designed for 3.6–12kV three-phase AC 50Hz single-busbar power distribution systems. The KYN28A-12 switchgear is a complete power distribution device used for power transmission of small and medium-sized generators in power plants, power receiving and transmission in industrial and mining enterprises, secondary electrical substations of power systems, and control, protection, and detection of large high-voltage motors. Compliant with IEC 62271-200, GB3906, and DL/T404, the KYN28A-12 switchgear features a four-compartment metal-clad structure with IP4X enclosure protection and complete five-prevention mechanical interlocking.

3.6–12kV 630–4000A 20–50kA / 4s Withstand IEC 62271-200 Compliant

Raydafon KYN28A-12 removable AC metal-clad switchgear 12kV with four-compartment design and VS1 vacuum circuit breaker — Figure 1: Raydafon KYN28A-12 removable AC metal-clad switchgear — four-compartment metal-clad structure with central withdrawable handcart and VS1 vacuum circuit breaker

Product Overview

The KYN28A-12 armored removable AC metal enclosed switchgear is a complete set of power distribution devices for 3–12kV three-phase AC 50Hz single-busbar breaking systems. It is mainly used for power transmission of small and medium-sized generators in power plants, power receiving and transmission of industrial and mining enterprises and institutions, secondary electrical substations of power systems, and control, protection, and detection of large high-voltage motors. The KYN28A-12 switchgear meets the requirements of IEC 62271-200, GB3906, and other standards. It is equipped with VS1 (ZN63A) vacuum circuit breakers or imported VD4, VB2, and 3AH vacuum circuit breakers.

Four-Compartment Metal-Clad Structure

Busbar Compartment

Houses the main busbar system with epoxy resin insulation. Separated from other compartments by grounded metal partitions.

Circuit Breaker Compartment

Contains the withdrawable handcart with VS1 (ZN63A), VD4, VB2, or 3AH vacuum circuit breaker. Front-accessible for inspection and maintenance.

Cable Compartment

For incoming and outgoing cable termination. Bottom cable entry with sufficient space for cable lugs and current transformers.

Relay Compartment

Houses protection relays, metering instruments, and control devices. Low-voltage wiring is separated from high-voltage circuits.

Five-Prevention Interlocking System

Prevents loaded push-pull operation of the circuit breaker handcart

Prevents accidental opening and closing of the circuit breaker

Prevents closing of the circuit breaker when the grounding switch is in the closed position

Prevents accidental entry into live compartments

Prevents accidental closing of the grounding switch when the circuit is live

Technical Specifications

KYN28A-12 Electrical & Mechanical Parameters

Rated VoltagekV3.6 / 7.2 / 12

Rated FrequencyHz50

Rated CurrentA630 / 1250 / 1600 / 2000 / 2500 / 3150 / 4000

Rated Short-Circuit Breaking CurrentkA20 / 25 / 31.5 / 40 / 50

Short-Time Withstand Current (4s)kA20 / 25 / 31.5 / 40 / 50

Rated Peak Withstand CurrentkA50 / 63 / 80 / 100 / 125

Power-Frequency Withstand Voltage (1 min)kV42 (to ground / phase)

Lightning Impulse Withstand VoltagekV75 (peak)

Enclosure Protection—IP4X (closed) / IP2X (open)

Number of Compartments—4 (busbar / breaker / cable / relay)

Compatible Vacuum Breakers—VS1 (ZN63A) / VD4 / VB2 / 3AH

Mechanical Endurance (Handcart)times≥ 3,000

Standards—IEC 62271-200 / GB3906 / DL/T404

Why KYN28A-12 Leads in Metal-Clad Switchgear

KYN28A-12 — Core Performance Metrics

12kVRated Voltage

4000AMax Rated Current

50kAMax Breaking Capacity

4comp.Separate Compartments

Structural Design Advantages

Central Withdrawable Handcart

The KYN28A-12 switchgear consists of two main parts: a cabinet body and a central withdrawable component (handcart). The handcart can be easily withdrawn for maintenance or replacement without disconnecting the busbar. Mechanical endurance of the handcart and grounding switch is at least 3,000 operations.

Four Separate Compartments

The cabinet body has four separate compartments: busbar compartment, circuit breaker compartment, cable compartment, and relay compartment. Each compartment is isolated by grounded metal partitions, preventing fault propagation between compartments and ensuring operator safety during maintenance.

Versatile Installation Options

The KYN28A-12 switchgear supports overhead incoming and outgoing lines, cable incoming and outgoing lines, and other functional schemes. It can be arranged and combined to form various forms of power distribution devices. The switchgear can be installed, debugged, and maintained from the front, allowing back-to-back double arrangement and wall-mounted installation, improving safety, flexibility, and reducing floor area.

Compatible with Multiple Breaker Brands

The KYN28A-12 switchgear is compatible with VS1 (ZN63A) vacuum circuit breakers, ABB VD4 vacuum circuit breakers, VB2 vacuum circuit breakers, and Siemens 3AH vacuum circuit breakers. This flexibility allows users to select the optimal circuit breaker based on specific project requirements and budget considerations.

Industry Applications

Power Plants

Power transmission for small and medium-sized generators. The KYN28A-12 switchgear provides reliable control, protection, and detection for generator auxiliary systems. Pair with medium voltage switchgear for complete plant distribution.

Industrial & Mining Enterprises

Power receiving and transmission in factories, mining operations, and industrial facilities. The IP4X enclosure protects against dust ingress in harsh environments. Compatible with low voltage switchgear for downstream distribution.

Secondary Electrical Substations

Secondary substations of power systems requiring reliable medium voltage distribution. The four-compartment design ensures fault containment and allows safe maintenance. Integrates with YBM prefabricated substations for compact distribution solutions.

Large High-Voltage Motor Control

Control, protection, and detection of large high-voltage motors in industrial applications. The KYN28A-12 switchgear supports vacuum circuit breakers up to 50kA breaking capacity for motor starting and protection. Pair with Remote-9001 monitoring unit for intelligent motor control.

Why Choose Raydafon KYN28A-12 Switchgear

20+ Years of Power Equipment Experience

Raydafon Technology Group has served the electrical equipment industry for over two decades, with products deployed across 40+ export countries. KYN28A-12 switchgear is a core product line in the RAYDAFON medium voltage switchgear portfolio.

IEC & Type-Test Compliance

All KYN28A-12 switchgear units are type-tested to IEC 62271-200 and GB3906, with routine factory acceptance tests (FAT) documented and shipped with every unit. Type-test reports available on request.

Full Documentation & After-Sales

Installation drawings, single-line diagrams, circuit breaker test reports, and component authenticity records ship with every KYN28A-12 switchgear. Engineering support responds within 24 hours.

Complete Switchgear Portfolio

Raydafon also manufactures KYN61-40.5 armored metal-clad switchgear for 40.5kV applications and KYN28A-24 switchgear for 24kV systems, providing a complete medium voltage switchgear range for all distribution voltage levels.

Frequently Asked Questions

What is KYN28A-12 switchgear?

KYN28A-12 is a removable AC metal-clad switchgear designed for 3.6–12kV three-phase AC 50Hz power distribution systems. It is a complete power distribution device used for power transmission in power plants, substations, industrial and mining enterprises, and for control, protection, and monitoring of large high-voltage motors. The KYN28A-12 switchgear features four separate compartments (busbar, circuit breaker, cable, and relay) and is equipped with VS1 (ZN63A) or VD4 vacuum circuit breakers.

What are the main technical parameters of KYN28A-12 switchgear?

KYN28A-12 switchgear supports rated voltage 3.6–12kV, rated current 630–4000A, rated short-circuit breaking current 20–50kA, short-time withstand current 20–50kA/4s, and peak withstand current 50–125kA. The power-frequency withstand voltage is 42kV for 1 minute, and lightning impulse withstand voltage is 75kV. Enclosure protection is IP4X with door closed and IP2X with door open.

What are the five-prevention interlocks in KYN28A-12 switchgear?

The KYN28A-12 five-prevention interlocks include: preventing loaded push-pull operation of the circuit breaker handcart, preventing accidental opening and closing of the circuit breaker, preventing closing of the circuit breaker when the grounding switch is in the closed position, preventing accidental entry into live compartments, and preventing accidental closing of the grounding switch when the circuit is live. These mechanical interlocks ensure operator safety and comply with GB3906 and IEC 62271-200 requirements.

What standards does KYN28A-12 switchgear comply with?

KYN28A-12 switchgear complies with IEC 62271-200 for AC metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to 52kV, GB3906 for 3.6kV–40.5kV AC metal-enclosed switchgear and control equipment, and DL/T404 for 3.6kV–40.5kV AC metal-enclosed switchgear and control equipment. The switchgear meets the requirements of single-busbar breaking systems with three-phase AC 50Hz.

What vacuum circuit breakers can be used with KYN28A-12 switchgear?

KYN28A-12 switchgear is compatible with VS1 (ZN63A) vacuum circuit breakers, VD4 vacuum circuit breakers from ABB, VB2 vacuum circuit breakers, and 3AH vacuum circuit breakers from Siemens. The central withdrawable component (handcart) allows easy replacement of the circuit breaker for maintenance or upgrade. The mechanical endurance of the handcart and grounding switch is at least 3,000 operations.

What are the typical applications of KYN28A-12 switchgear?

KYN28A-12 switchgear is used for power transmission of small and medium-sized generators in power plants, power receiving and transmission in industrial and mining enterprises and institutions, secondary electrical substations of power systems, and large high-voltage motor control, protection, and detection. It can be combined back-to-back into double arrangements or installed against the wall, improving flexibility and reducing floor area.

Related Equipment

For a complete medium voltage distribution solution, pair the KYN28A-12 switchgear with:

KYN61-40.5 Armored Metal-Clad Switchgear — For 40.5kV medium voltage applications
KYN28A-24 Removable AC Metal-Clad Switchgear — For 24kV systems with the same withdrawable design
Ring Main Units (RMUs) — For SF6 or SF6-free ring network applications
Low Voltage Switchgear — For downstream LV distribution
YBM Prefabricated Substations — For compact distribution solutions with factory-integrated MV switchgear
Remote-9001 Monitoring Unit — For SCADA integration and intelligent switchgear monitoring

3.6–12kV rated voltage

630–4000A rated current

20–50kA/4s short-time withstand

Four-compartment metal-clad structure

Five-prevention mechanical interlocking

IEC 62271-200 & GB3906 compliant

Ready to Specify Your KYN28A-12 Switchgear?

Share your rated voltage, rated current, and circuit breaker preference — our engineers will reply with a tailored KYN28A-12 switchgear configuration and factory-direct quote within 24 hours.

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