JN22B-40.5/31.5 Indoor High Voltage AC Earthing Switch – 40.5kV Grounding Isolation Switch for KYN61-40.5 Switchgear Protection
The JN22B-40.5/31.5 is a high-performance indoor high-voltage earthing isolation switch designed for 40.5kV AC 50Hz power systems. Fully compliant with IEC62271-102 and GB1985 standards, this switch is an improved advanced model engineered for integration with KYN61-40.5 metal-clad switchgear and other medium-to-high voltage power distribution units. It provides critical safety protection during equipment overhaul by establishing a reliable grounding path, featuring a short-circuit making capacity that safeguards vital electrical infrastructure. With its rapid-closing spring mechanism, the switch ensures consistent performance and operator safety regardless of manual operating speed.
JN22B-40.5/31.5 Indoor High Voltage AC Earthing Isolation Switch (40.5kV)
Product Overview
The JN22B-40.5/31.5 is an advanced indoor high-voltage earthing isolation switch designed for power systems with a maximum voltage of 40.5kV and a rated frequency of AC 50Hz. This model represents an improved level of performance built upon the JN22-40.5/31.5 series, featuring high-tech parameters for modern electrical grids. It is specifically engineered to be used with KYN61-40.5 metal-clad switchgear and other high-voltage distribution units, playing a critical protective role during equipment overhaul and maintenance.
Core Features & Technical Advantages
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Advanced Design & High Performance: Features an improved structural design that ensures steady and reliable performance in demanding high-voltage environments.
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Fast Closing Capability: Equipped with a rapid-closing mechanism where the closing speed is completely independent of the operator’s manual speed, ensuring consistent safety.
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Robust Protection: Possesses a reliable short-circuit making capacity to prevent damage to other electrical assets in the event of a system fault.
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User-Friendly Operation: Designed as a scientific apparatus that can be conveniently operated from both the left and right sides, making it highly adaptable for various cabinet configurations.
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Precision Craftsmanship: Reflects delicate manufacturing quality with a handsome appearance and simple structure for easy installation and adjustment.
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Visual Status Verification: Includes a clear mechanical indicator (Green “O”) for immediate identification of the switch’s open or closed state.
Technical Specifications
| Item | Unit | Data |
| Rated Voltage | kV | 35 |
| Maximum Voltage | kV | 40.5 |
| Rated Short-time Withstand Current | kA | 31.5 |
| Rated Short-circuit Duration | s | 4 |
| Rated Short-circuit Making Current | kA | 80 |
| Rated Peak Withstand Current | kA | 80 |
| PF Withstand Voltage (1 min) – Earth | kV | 95 |
| Lightning Impulse Withstand Voltage | kV | 185 |
Standard Working Conditions
To ensure safe operation and long-term reliability, the following conditions must be met:
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Altitude: Not exceeding 1,000 meters above sea level.
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Ambient Temperature: Operational range between -10°C and +40°C.
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Relative Humidity: Daily average ≤ 95%; monthly average ≤90%.
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Seismic Intensity: Resistant to seismic activity up to 8 degrees.
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Environmental Safety: The installation site must be free from inflammable or explosive materials, corrosive gases, and severe vibrations.
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