JN15-24/31.5 Indoor High Voltage AC Earthing Switch – 24kV High-Speed Grounding Switch with Silver-Plated Electrolytic Copper Blades for Power System Protection
The JN15-24/31.5 is an advanced indoor high-voltage earthing switch designed for 24kV three-phase AC 50Hz power systems. Fully compliant with GB1985 and IEC62271 standards, this switch is engineered with high-tech parameters, including a short-circuit making capacity of 80kA to protect critical electrical equipment from damage. The unit features high-quality resin insulators and contact blades made of 99.9% silver-plated electrolytic copper, ensuring minimal ohmic resistance and maximum durability against thermal and mechanical stresses. It is an essential safety component for medium-voltage switchgear, providing reliable grounding during equipment overhaul and maintenance.
JN15-24/31.5 Indoor AC High Voltage Earthing Switch (24kV)
Product Overview
The JN15-24/31.5 is an advanced-level indoor high-voltage earthing switch designed for 24kV power systems and three-phase AC 50Hz networks. Fully compliant with GB1985 and IEC62271 standards, this switch is a critical safety component used with various types of high-voltage switchgear. It plays a vital protective role during the overhaul of high-voltage electrical equipment by providing a reliable grounding path and possessing a short-circuit making capacity to prevent damage to other electrical assets.
Core Features & Technical Advantages
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Superior Material Quality: The switch utilizes resin insulators and features live parts made of 99.9% silver-plated electrolytic copper, ensuring exceptional conductivity and minimal resistance.
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High Durability Design: Contact elements are over-dimensioned to guarantee high contact pressure between blades and contacts, resulting in reduced ohmic resistance and minimal metal wear-off over the switch’s lifespan.
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Fast Breaking & Making: Engineered for rapid operation, the switch possesses a reliable fast-breaking and making capability to handle fault conditions effectively.
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Robust Mechanical Strength: Designed with the necessary robustness to withstand significant thermal and mechanical stresses encountered under short-circuit conditions.
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Flexible Operation: Featuring a simple and scientific apparatus design, the switch can be conveniently operated from both the left and right sides.
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Precision Manufacturing: Boasts a handsome appearance and delicate manufacture craft, reflecting its advanced design and steady performance.
Technical Specifications
| Item | Unit | Data |
| Rated Voltage | kV | 24 |
| 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 | 65 |
| Lightning Impulse Withstand Voltage | kV | 125 |
| Mechanical Endurance | cycles | 2000 |
Standard Working Conditions
To ensure safe and reliable operation, the following environmental requirements must be met:
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Altitude: Not exceeding 1,000 meters above sea level.
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Ambient Temperature: Operational within a range of -25°C to +40°C.
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Relative Humidity: Daily average ≤ 95%; monthly average≤ 90%.
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Earthquake Intensity: Resistant to seismic activity up to 8 degrees.
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Pollution Degree: Classified as Class II.
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