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China KYN61-40.5 Armored Withdrawable AC Metal-Enclosed Switchgear - Reliable Supply from Factory Suppliers
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.
- Medium and large-scale industrial plants (e.g., steel mills, chemical plants) that require stable high-voltage power supply.
- Urban substations (as part of the 35kV/10kV transformation system).
- 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
40.5 kV
Adapted to 35kV systems; max operating voltage 46kV
Rated Frequency
50 Hz
Compatible with standard power grids in China and most regions
Rated Current (Main Circuit)
1250 A
Optional: 630A, 1000A, 1600A, etc.
Auxiliary Circuit
220V / 380V
For control, protection, and monitoring components
Short-Time Withstand Current
≥ 25 kA
Duration: 4s; withstands short-circuit impact
Peak Withstand Current
≥ 63 kA
Resists instantaneous peak current from short circuits
Power Frequency Withstand Voltage
95 kV (1 min)
Between live parts and ground; between different phases
Lightning Impulse Withstand Voltage
185 kV
Protects against overvoltage caused by lightning strikes
IP Protection Grade
IP4X
Prevents solid objects ≥1mm from entering; suitable for indoor use
Operating Temperature
-10°C to +40°C
Normal operation; derating required beyond this range
Detail Pictures
Frequently Asked Questions
Q What is the KYN61-40.5 high-voltage switchgear primarily used for?
A The KYN61-40.5 is primarily used for receiving, distributing, and protecting high-voltage electrical energy in 35kV power distribution systems. It is commonly deployed in power plants, substations, industrial and mining enterprises, and large-scale commercial buildings as an incoming line cabinet.
Q What does the "metal-clad, compartmentalized structure" mean and why is it important?
A It means the cabinet is divided into separate functional compartments — circuit breaker, busbar, cable, and secondary control — each isolated by grounded metal partitions. This design prevents faults from spreading between compartments, significantly enhancing operational safety and minimizing damage in case of an internal fault.
Q What is the rated current of the KYN61-40.5 main circuit, and are other ratings available?
A The standard rated current shown is 1250A, which supports long-term continuous operation. Other optional specifications include 630A, 1000A, and 1600A, allowing the cabinet to be configured based on specific project requirements.
Q What short-circuit protection capabilities does the KYN61-40.5 offer?
A The cabinet provides a rated short-time withstand current of ≥25kA (for 4 seconds) and a rated peak withstand current of ≥63kA, ensuring it can safely handle short-circuit events without structural failure or hazard to personnel.
Q Is the KYN61-40.5 suitable for outdoor installation?
A No. The KYN61-40.5 carries an IP4X protection grade, which is designed for indoor installation environments. It protects against solid foreign objects ≥1mm but is not rated for outdoor exposure to rain or harsh weather conditions.
Q What are the operating temperature limits for the KYN61-40.5?
A The KYN61-40.5 operates normally within a temperature range of -10°C to +40°C. If the ambient temperature exceeds this range, derating measures are required to ensure safe and reliable operation of the equipment.