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KYN61-40.5 Armored Withdrawable AC Metal-Enclosed Switchgear - China Suppliers & Factory for High Voltage Solutions
Basic Overview
This KYN61-40.5 type high-voltage switchgear is a core electrical equipment widely applied in 35kV power distribution systems. It's designed for receiving, distributing, and protecting high-voltage electrical energy, typically used in power plants, substations, industrial and mining enterprises, and large-scale commercial buildings.
The KYN61-40.5 cabinet adopts a metal-clad, compartmentalized structure (complying with GB3906-2020 standards), which separates functional areas — such as the circuit breaker compartment, busbar compartment, cable compartment, and secondary control compartment — with grounded metal partitions.
This design effectively prevents the spread of faults between compartments and enhances operational safety. The cabinet shown is an "incoming line cabinet" (responsible for connecting the external power supply to the distribution system), marked with ANN1 (cabinet number) and 1250A (rated current of the main circuit).
Application Scenarios
As an incoming line cabinet, it serves as the "entry point" of the 35kV power distribution system: it connects the power supply (e.g., from a substation) to the busbar, distributes power to outgoing line cabinets, and provides protection for the entire system.
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Medium and large-scale industrial plants (e.g., steel mills, chemical plants) that require stable high-voltage power supply.
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Urban substations (as part of the 35kV/10kV transformation system).
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Large commercial complexes (to meet the high-power electricity demand of multiple equipment).
⚡ In summary, the KYN61-40.5 (1250A) incoming line cabinet is a high-reliability, safe high-voltage switchgear with standardized parameters and a modular structure. It balances operational convenience and fault protection, making it a key device in modern 35kV power distribution networks.
Technical Parameters
Rated Voltage
40.5kV — adapted to 35kV power systems; maximum operating voltage of 46kV.
Rated Frequency
50Hz — compatible with standard power grids in China and most regions.
Rated Current
Main circuit: 1250A (optional: 630A, 1000A, 1600A, etc.)
Auxiliary circuit: 220V / 380V (control, protection & monitoring)
Auxiliary circuit: 220V / 380V (control, protection & monitoring)
Short-Time Withstand Current
≥25kA (duration: 4s) — withstands short-circuit impact within the specified time.
Peak Withstand Current
≥63kA — resists instantaneous peak current generated by short circuits.
Insulation Level
Power frequency withstand (1min): 95kV
Lightning impulse withstand: 185kV
Lightning impulse withstand: 185kV
IP Protection Grade
IP4X — prevents solid foreign objects ≥1mm from entering; suitable for indoor installation.
Operating Temperature
-10°C to +40°C — normal operation; derating required when exceeding this range.
Detail Pictures
Frequently Asked Questions
Q
What is the KYN61-40.5 high-voltage switchgear used for?
The KYN61-40.5 is a metal-clad, compartmentalized high-voltage switchgear designed for 35kV power distribution systems. It is used to receive, distribute, and protect high-voltage electrical energy in power plants, substations, industrial facilities, and large commercial buildings.
Q
What does the "1250A" marking on the cabinet indicate?
The "1250A" marking refers to the rated current of the main circuit. It means the cabinet can support long-term continuous operation under a current of 1250 amperes. Other optional specifications include 630A, 1000A, and 1600A to suit different application requirements.
Q
What standard does the KYN61-40.5 comply with?
The KYN61-40.5 switchgear complies with the GB3906-2020 standard, which is the Chinese national standard for metal-enclosed switchgear and controlgear for alternating current systems above 1kV and up to and including 40.5kV.
Q
What is the IP protection grade of the KYN61-40.5, and where can it be installed?
The KYN61-40.5 has an IP4X protection grade, which means it prevents solid foreign objects of 1mm or larger from entering the enclosure. This makes it suitable for indoor installation environments such as substations, switchrooms, and enclosed industrial facilities.
Q
How does the compartmentalized structure improve safety?
The compartmentalized design separates functional areas — including the circuit breaker compartment, busbar compartment, cable compartment, and secondary control compartment — using grounded metal partitions. This structure effectively contains faults within individual compartments, preventing them from spreading to other areas and significantly enhancing overall operational safety.
Q
What is the operating temperature range of the KYN61-40.5?
The KYN61-40.5 is designed for normal operation within a temperature range of -10°C to +40°C. If the ambient temperature exceeds this range, derating measures must be applied to ensure safe and reliable performance of the equipment.