KYN28A-24 Removable AC Metal-Clad Switchgear (24kV)

KYN28A-24 24kV metal-clad withdrawable switchgear, 630–4000A rated current, 25–40kA short-circuit breaking capacity, 65/79kV power-frequency withstand, 125/145kV lightning impulse. LSC2B continuity classification, 1.1Ir temperature rise. Smart programmable operation with touch-screen HMI and remote control. IEC 62271-200 compliant.

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Product Description

KYN28A-24 Removable AC Metal-Clad Switchgear (24kV)

Raydafon KYN28A-24 is an armored removable AC metal-clad switchgear designed for 24kV three-phase AC 50Hz single-busbar and double-busbar segmented systems. The KYN28A-24 switchgear is mainly used in energy, industry, and infrastructure fields for receiving and distributing electrical energy, and for controlling, protecting, and monitoring circuits. Compliant with IEC 62271-200, GB3906, and DL/T404, the KYN28A-24 switchgear features a rated voltage of 24kV, maximum rated current up to 4000A, and maximum rated short-circuit breaking current up to 40kA. The loss of continuity category is LSC2B, and the switchgear meets the temperature rise requirement of 1.1Ir.

24kV Rated Voltage Up to 4000A 40kA Breaking Capacity IEC 62271-200 Compliant

Raydafon KYN28A-24 removable AC metal-clad switchgear 24kV with solid-sealed pole vacuum circuit breaker and smart programmable operation — Figure 1: Raydafon KYN28A-24 armored removable AC metal-clad switchgear — 24kV medium voltage switchgear with LSC2B continuity classification and programmable operation

Product Overview

The KYN28A-24 armored movable AC metal enclosed switchgear is the latest generation of medium voltage AC metal enclosed switchgear and control equipment developed by Raydafon. The KYN28A-24 switchgear is suitable for three-phase AC 50Hz single-busbar and double-busbar segmented systems, mainly used in energy, industry, infrastructure, and other fields as a means of receiving and distributing electrical energy and controlling, protecting, and monitoring circuits. The KYN28A-24 switchgear is equipped with indoor medium voltage vacuum circuit breakers with excellent performance, adopting solid-sealed pole circuit breakers with optimized overall structure and insulation to enhance insulation performance inside the cabinet.

Core Performance at a Glance

24kV Rated Voltage

Medium Voltage Distribution Platform

The KYN28A-24 switchgear supports a rated voltage of 24kV and is suitable for 20kV ungrounded neutral power grid systems. The power-frequency withstand voltage reaches 65/79kV (isolation fracture), and the lightning impulse withstand voltage is 125/145kV. This makes the KYN28A-24 switchgear suitable for medium voltage distribution networks in energy, industry, and infrastructure applications.

4000A Maximum Rated Current

High-Current Distribution Capability

The KYN28A-24 switchgear supports rated current options of 630A, 1250A, 1600A, 2000A, 2500A, and 4000A, covering a wide range of medium voltage distribution applications. The rated short-circuit breaking current is 25/31.5/40kA, and the rated short-time withstand current is 25/31.5/40kA for 4 seconds, providing reliable protection for high-capacity industrial and infrastructure loads.

40kA Max Breaking Capacity

Reliable Short-Circuit Protection

The KYN28A-24 switchgear provides rated short-circuit making current of 63/80/100kA and rated peak withstand current of 63/80/100kA. The solid-sealed pole vacuum circuit breaker with optimized internal structure ensures reliable short-circuit breaking performance, making the KYN28A-24 switchgear suitable for high-fault-current industrial and infrastructure applications.

Smart Programmable Operation

Programmed Design with Touch-Screen HMI

The KYN28A-24 switchgear features a fully programmable design: handcart entry and exit, grounding switch opening and closing, and circuit breaker opening and closing can all be electrically operated. The touch-screen HMI provides a simulation diagram for component operations, allowing operators to control the KYN28A-24 switchgear through an intuitive interface. This reduces operator error and improves safety in medium voltage distribution operations.

Remote and On-Site Operation

All operations of the KYN28A-24 switchgear, including the entry and exit of the circuit breaker handcart and the opening and closing of the grounding switch, can be achieved through a backend computer. Work instructions can be revoked at any time during the operation process, providing flexibility for remote operation in unattended substations and industrial facilities. This makes the KYN28A-24 switchgear suitable for integration with Remote-9001 monitoring units for SCADA-controlled operations.

Multiple Locking Functions

The KYN28A-24 switchgear is equipped with multiple locking functions, including electric entry and exit of the circuit breaker handcart and electric opening and closing operation of the grounding switch. These locking functions prevent operators from accidentally entering live compartments, ensuring safety during medium voltage distribution operations. The loss of continuity category is LSC2B, and the KYN28A-24 switchgear meets the temperature rise requirement of 1.1Ir.

Insulation and Safety Features

65/79kV Power-Frequency Withstand

Enhanced Insulation Performance

The KYN28A-24 switchgear adopts a solidly-sealed pole circuit breaker with optimized overall structure and insulation to enhance insulation performance inside the cabinet. The internal structure of the KYN28A-24 switchgear is optimized and designed to evenly distribute the electric field, ensuring electrical clearance. Adopting flame-retardant shielding sleeves and contact boxes, the flame-retardant rating reaches grade, and the electric field distribution of insulation components is more uniform.

1.1Ir Temperature Rise Requirement

Optimized Thermal Convection

The KYN28A-24 switchgear optimizes thermal convection channels to enhance heat dissipation inside the cabinet. This design allows the KYN28A-24 switchgear to meet the temperature rise requirement of 1.1Ir, exceeding standard requirements for continuous operation at rated current. The improved thermal management extends the service life of internal components and maintains stable performance in high-temperature industrial environments.

Technical Specifications

KYN28A-24 Electrical & Mechanical Parameters

Rated Parameters

Rated VoltagekV24

Rated FrequencyHz50

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

Rated Short-Circuit Breaking CurrentkA25 / 31.5 / 40

Rated Short-Circuit Making CurrentkA63 / 80 / 100

Rated Short-Time Withstand Current (4s)kA25 / 31.5 / 40

Rated Peak Withstand CurrentkA63 / 80 / 100

Insulation Level

Power-Frequency Withstand Voltage (1 min)kV65/79 (isolation fracture)

Lightning Impulse Withstand VoltagekV125/145 (isolation fracture)

Control Circuit Withstand Voltage (1 min)V2000

Auxiliary & Protection

Auxiliary Control Circuit VoltageVDC or AC 110/220

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

Loss of Continuity Category—LSC2B

Temperature Rise—1.1 Ir

Standards

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

Overall Dimensions & Weight

2400mm Cabinet Height

800–1000mm Cabinet Width

1800mm Cabinet Depth

The KYN28A-24 switchgear cabinet weighs between 840kg and 1440kg depending on configuration. Overall dimensions are 800/1000 × 1800 × 2400mm (width × depth × height). Front-access installation, debugging, and maintenance allow for back-to-back double arrangement and wall-mounted installation, improving safety, flexibility, and reducing floor area.

Industry Applications

Energy & Power Systems

The KYN28A-24 switchgear is used in energy and power systems for receiving and distributing electrical energy. It supports single-busbar and double-busbar segmented systems for reliable medium voltage distribution. Pair with medium voltage switchgear for complete power distribution solutions.

Industrial Plants

The KYN28A-24 switchgear is suitable for industrial plants requiring reliable 24kV medium voltage distribution. The LSC2B continuity classification and 1.1Ir temperature rise capability ensure continuous operation in demanding industrial environments. Integrates with low voltage switchgear for downstream distribution.

Infrastructure Projects

The KYN28A-24 switchgear supports infrastructure projects including airports, subways, and large commercial facilities. The IP4X protection level ensures safety in various indoor environments. Compatible with YBM prefabricated substations for compact distribution solutions.

High-Voltage Motor Control

The KYN28A-24 switchgear provides control, protection, and monitoring for large high-voltage motors. The solid-sealed pole vacuum circuit breaker ensures reliable motor starting and protection. Pair with Remote-9001 monitoring units for intelligent motor control and SCADA integration.

Why Choose Raydafon KYN28A-24 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. The KYN28A-24 switchgear is a core product line in the RAYDAFON medium voltage switchgear portfolio.

IEC & Type-Test Compliance

All KYN28A-24 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.

Complete Switchgear Portfolio

Raydafon also manufactures KYN28A-12 switchgear for 12kV applications and KYN61-40.5 armored metal-clad switchgear for 40.5kV systems, providing a complete medium voltage switchgear range for all distribution voltage levels.

Full Documentation & After-Sales

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

Frequently Asked Questions

What is KYN28A-24 switchgear?

KYN28A-24 is an armored removable AC metal-clad switchgear designed for 24kV three-phase AC 50Hz single-busbar and double-busbar segmented systems. It is used in energy, industry, and infrastructure fields for receiving and distributing electrical energy, and for controlling, protecting, and monitoring circuits. The switchgear is equipped with indoor medium-voltage vacuum circuit breakers with excellent performance, and its loss of continuity category is LSC2B.

What are the main technical parameters of KYN28A-24 switchgear?

KYN28A-24 switchgear supports rated voltage 24kV, rated frequency 50Hz, rated current 630/1250/1600/2000/2500/4000A, rated short-circuit breaking current 25/31.5/40kA, and rated short-time withstand current 25/31.5/40kA for 4 seconds. The power-frequency withstand voltage is 65/79kV for the isolation fracture, and lightning impulse withstand voltage is 125/145kV. Protection is IP4X with door closed and IP2X with door open. Overall dimensions are 800/1000×1800×2400mm with weight 840–1440kg.

What are the smart features of KYN28A-24 switchgear?

KYN28A-24 switchgear features programmable design: handcart entry and exit, grounding switch opening and closing, and circuit breaker opening and closing can all be electrically operated. The touch-screen HMI provides a simulation diagram for component operations. Remote and on-site operation are supported via a backend computer, and work instructions can be revoked at any time during the operation process. Multiple locking functions prevent accidental entry into live compartments.

What safety and insulation features does KYN28A-24 switchgear have?

KYN28A-24 switchgear adopts a solidly-sealed pole circuit breaker with optimized overall structure and insulation. It uses flame-retardant shielding sleeves and contact boxes with grade-rated flame-retardant rating. The internal structure is optimized to evenly distribute the electric field and ensure electrical clearance. Thermal convection channels are optimized to enhance heat dissipation. The temperature rise requirement of 1.1Ir is met, exceeding standard requirements.

What standards does KYN28A-24 switchgear comply with?

KYN28A-24 switchgear complies with IEC 62271-200 for AC metal-enclosed switchgear and controlgear, GB3906 for 3.6kV–40.5kV AC metal-enclosed switchgear and control equipment, and DL/T404. The switchgear is suitable for 20kV ungrounded neutral power grid systems and meets the LSC2B loss of continuity classification.

What are the typical applications of KYN28A-24 switchgear?

KYN28A-24 switchgear is mainly used in energy, industry, and infrastructure fields as a means of receiving and distributing electrical energy, and controlling, protecting, and monitoring circuits. It is suitable for secondary substations, industrial plants, and high-voltage motor control applications. The switchgear supports both single-busbar and double-busbar segmented systems.

Related Equipment

For a complete medium voltage distribution solution, pair the KYN28A-24 switchgear with:

KYN28A-12 Removable AC Metal-Clad Switchgear — For 12kV medium voltage applications
KYN61-40.5 Armored Metal-Clad Switchgear — For 40.5kV high-voltage distribution systems
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

24kV rated voltage, up to 4000A rated current

40kA short-circuit breaking capacity

LSC2B continuity classification

1.1Ir temperature rise capability

Smart programmable operation with touch-screen HMI

IEC 62271-200 & GB3906 compliant

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