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KYN550-12 Indoor Armored Removable AC Metal-Clad Switchgear
Overview
The KYN550-12 indoor armored removable AC metal-clad switchgear (hereinafter referred to as KYN550-12 switchgear) is one of the most compact 12kV, three-phase, 50Hz switchgears for single-bus and single-bus section systems.
It incorporates a complete "five-prevention" interlock system:
Preventing withdrawal/insertion of the circuit breaker truck under load
Preventing the incorrect opening/closing of the circuit breaker
Preventing the closing of the circuit breaker when the earthing switch is closed
Preventing entry into live compartments
Preventing the closing of the earthing switch when the compartment is live
Equipped with an indoor medium voltage solid-sealed vacuum circuit breaker truck, it is a high-performance power distribution device.
Its compact design saves significant switchroom space, making it ideal for commercial and industrial buildings, real estate, data centers, and other industrial power grids with miniaturization requirements.
Standards
This switchgear complies with IEC62271-200, GB3906, DL/T404, and other relevant standards.
Protection rating of enclosure: IP4X
Protection rating when the circuit breaker compartment door is open, andthe truck is removed: IP2X
Environmental Conditions for Use
Normal Operating Conditions
Ambient air temperature: -25°C to +40°C
Humidity: Daily average ≤95%, monthly average ≤90%
Seismic intensity: ≤8 degrees
Ambient air: Free from corrosive/flammable gases, water vapor, or heavy pollution
Vibration: No severe pollution or continuous strong vibration; meets Class 1 requirements under harsh conditions
Special Operating Conditions
If used beyond the normal environmental conditions specified in GB3906 and this technical specification, consultation between the user and manufacturer is required.
Product Features
✅ Eco-friendly: Uses recyclable, non-polluting materials✅ Safe & Reliable: Fully enclosed metal enclosure with visible isolation breaks for operator safety✅ Compact & Cost-effective: One of the smallest switchgears in its class, reducing civil engineering costs and enabling easy retrofits✅ Intelligent: Supports automatic protection devices and online monitoring for full automation in smart grids✅ Customizable: Tailored solutions available for specific customer requirements
Technical Parameters
| Parameter | Unit | Specification |
|---|---|---|
| Rated voltage | kV | 12 |
| Rated frequency | Hz | 50 |
| Power frequency withstand voltage (1min) | kV | 42/48 (breaker open) |
| Lightning impulse withstand voltage (peak) | kV | 75/85 (breaker open) |
| Rated current | A | ≤ 1250 |
| Rated short-time withstand current (4s) | kA | ≤ 31.5 |
| Rated peak withstand current | kA | ≤ 80 |
| Main circuit resistance | μΩ | ≤ 100 + CT² (includes CT DC resistance) |
| Protection rating - Enclosure | - | IP4X |
| Protection rating - Breaker compartment open | - | IP2X |
Notes:
1. The short-time and peak withstand currents of current transformers (CTs) depend on their ratio, which must be specified when ordering.
2. Main circuit resistance includes the DC resistance of current transformers.
Frequently Asked Questions (FAQ)
1. What does the "five-prevention" interlock system include?
It prevents:
Withdrawal/insertion of the circuit breaker truck under load
Incorrect opening/closing of the circuit breaker
Closing of the circuit breaker when the earthing switch is closed
Entry into live compartments
Closing of the earthing switch when the compartment is live
This is a core safety feature protecting personnel and equipment.
2. What do the IP4X and IP2X protection ratings mean?
IP4X: The standard enclosure rating, preventing entry of solid objects ≥1mm (e.g., dust, tools)
IP2X: The rating when the breaker compartment door is open, preventing entry of solid objects ≥12.5mm and accidental finger contact with live parts, ensuring maintenance safety
3. What practical benefits does the compact size offer?
As one of the smallest 12kV switchgears on the market, it reduces switchroom footprint.This lowers civil engineering costs in space-constrained locations like data centers and enables retrofits without major room expansions.
4. How to handle humidity exceeding the standard limit?
If the monthly average humidity exceeds 90%, install an intelligent dehumidifier inside the switchgear and use industrial air conditioning/ventilation in the switchroom.For extreme conditions, contact the factory for a customized moisture-proof solution.
5. What does the main circuit resistance ≤100 + CT² μΩ mean?
This value includes the DC resistance of current transformers (CTs), which varies with CT ratio.Provide the exact CT ratio when ordering for accurate resistance matching.
6. Is the switchgear upgradable for smart grid integration?
Yes. It supports automatic protection devices and online monitoring with temperature, humidity, and partial discharge sensors.This enables remote monitoring, fault alerts, and integration with fully automated power grids.
7. Why is the CT ratio important for withstanding current?
CT short-time and peak withstand currents decrease as the CT ratio increases.Specify the exact CT ratio when ordering to ensure compatibility with your system's short-circuit capacity.
8. What customization options are available?
We offer:
Additional compartment configurations
Alternative circuit breaker types
Expanded communication interfaces for monitoring systems
Enhanced protection ratings for dusty/corrosive environments
Custom internal layouts for site-specific installation
