JN22-40.5/31.5 Indoor High Voltage AC Disconnect Earthing Switch – 3-Phase 35kV/40.5kV Ground Switch for KYN61-40.5 Switchgear Protection
The JN22-40.5/31.5 is a high-performance indoor high-voltage earthing switch designed for 40.5kV AC 50Hz power systems (typically used in 35kV applications). Fully compliant with the GB1985 standard, this switch is specifically engineered for use with KYN61-40.5 metal-clad switchgear to provide critical safety protection during equipment maintenance. It features a robust short-circuit making capacity that effectively prevents damage to surrounding electrical components during fault conditions. Equipped with a rapid-closing spring mechanism, the switch ensures consistent contact engagement and operator safety, as the closing speed is completely independent of manual operation.
JN22-40.5/31.5 Indoor High Voltage AC Disconnect Earthing Switch (35kV/40.5kV)
Product Overview
The JN22-40.5/31.5 is an advanced indoor high-voltage disconnect and earthing switch designed for 40.5kV (typically used in 35kV systems) and three-phase AC 50Hz power networks. This model is specifically engineered for use with KYN61-40.5 metal-clad switchgear and other types of high-voltage distribution cabinets. It provides a critical safety layer during the overhaul and maintenance of high-voltage electrical equipment by establishing a reliable grounding path and preventing damage to other electrical assets via its built-in short-circuit making capacity.
Core Features & Technical Advantages
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High-Tech Parameters: An advanced-level product refined for modern grid requirements with verified steady performance.
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Robust Construction: Features a main bracket bent from thin steel plate and professionally welded for high structural integrity.
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Operator Independent Closing: Equipped with a pressure spring energy storage system that ensures the closing speed is completely independent of the operator’s manual speed.
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Rapid & Reliable Action: Utilizes a torque-driven main shaft and compression springs to achieve fast breaking and making capabilities.
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Secure Contact Engagement: In the closed position, the grounding knives are firmly and reliably contacted by the flange portion of the disc spring and the stationary contact.
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Versatile Operation: Features a scientific apparatus design that can be conveniently operated from both the left and right sides.
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Visual Status Indicator: Features 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
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Altitude: Not exceeding 1,000 meters.
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Ambient Temperature: Operational range from -10°C to +40°C.
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Relative Humidity: Daily average $\le$ 95%; monthly average $\le$ 90%.
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Seismic Intensity: Resistant to activity up to 8 degrees.
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Pollution Level: Classified as Class II.
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Site Restrictions: The area must be free from inflammable materials, explosive hazards, corrosive gases, and severe vibrations.
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