JN22B-40.5/31.5 Motorized Indoor High Voltage AC Earthing Switch – 40.5kV Electric Grounding Switch for Automated KYN61-40.5 Switchgear
The JN22B-40.5/31.5 is an advanced, motorized indoor high-voltage earthing switch designed for 40.5kV AC 50Hz power systems. Built upon the proven JN22 series, this upgraded model features an integrated electric motor drive for seamless remote operation and automation in modern power grids. Fully compliant with GB1985 and IEC standards, it provides critical safety grounding for KYN61-40.5 switchgear during equipment maintenance. With a rated short-circuit making current of 80kA, it ensures robust protection for your electrical infrastructure, offering reliable performance independent of manual operation speed.
JN22B-40.5/31.5 Motorized Indoor AC High Voltage Earthing Switch (40.5kV)
Product Overview
The JN22B-40.5/31.5 is an advanced-level indoor high-voltage earthing switch equipped with a motorized mechanism for modern power systems. Designed for 40.5kV (typically 35kV) and AC 50Hz networks, this model is an improved version of the JN22 series, offering high-tech performance and enhanced automation capabilities. It is specifically engineered for use with KYN61-40.5 metal-clad switchgear to provide reliable safety grounding during electrical equipment overhaul and maintenance.
Core Features & Technical Advantages
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Motorized Automation: Integrated electric motor allows for convenient remote control and automated operation, ideal for smart grid distribution.
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High-Tech Parameters: Refined based on the JN22 series to deliver steadier performance and superior technical specifications.
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Operator Independent Action: The rapid closing and opening speed of the grounding switch is completely independent of manual operation, ensuring safety and consistent contact performance.
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Robust Protection: Features a reliable short-circuit making capacity of 80kA to protect vital electrical infrastructure from damage during fault conditions.
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Stable Contact Design: In the closed position, grounding knives are firmly contacted by the flange portion of the disc spring and stationary contact for high-pressure electrical stability.
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Flexible Side Operation: The scientific apparatus design allows the switch to be operated conveniently from both the left and right sides.
Technical Specifications
| Item | Unit | Data |
| Rated Voltage | kV | 35 |
| Maximum Voltage | kV | 40.5 |
| Rated Short-time (4s) Withstand Current | kA | 31.5 |
| 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 |
| Phases Center Distance | mm | 280, 300, 350, 400 |
Standard Operating Conditions
To ensure long-term reliability, the following installation conditions must be met:
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Altitude: Not exceeding 1,000 meters.
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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 activity up to 8 degrees.
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Site Environment: The installation area must be free from inflammable materials, explosive hazards, corrosive gases, and severe vibrations.
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