JN15A-12/31.5 Indoor High Voltage AC Grounding Switch – 12kV Earth Switch for MV Switchgear Protection (Without Sensor)
The JN15A-12/31.5 is an advanced indoor high-voltage grounding switch designed for 3-12kV three-phase AC 50Hz power systems. Fully compliant with GB1985 and IEC62271 standards, this switch features high-tech parameter performance and a robust short-circuit making capacity to protect electrical equipment from damage. It is an essential safety component for medium voltage (MV) switchgears and switching stations, playing a critical protective role during high-voltage electrical equipment overhauls. Engineered for reliability, it ensures safe grounding in environments free from conductive dust and corrosive gases.
JN15A-12/31.5 Indoor High-Voltage AC Earthing Switch (12kV)
Product Overview
The JN15A-12/31.5 is an advanced indoor high-voltage grounding switch designed for 3-12kV three-phase AC 50Hz power systems. Engineered with high-tech parameter performance, this switch provides a critical short-circuit making capacity to protect expensive electrical equipment from damage. It is an essential safety component for medium voltage (MV) switchgears and switching stations, playing a vital protective role during high-voltage electrical equipment overhauls.
Core Features & Technical Advantages
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International Standard Compliance: Fully evaluated and compliant with GB1985 and IEC62271 standards for global industrial use.
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Superior Protection: Features a robust short-circuit making capacity, ensuring safety for the entire power system during fault conditions.
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Reliable Mechanical Life: Built for long-term durability with a mechanical life rated for significant operational cycles.
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High Insulation Level: Boasts a rated power frequency withstand voltage of 42kV and a lightning impulse withstand voltage of 75kV.
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Rugged Construction: Designed as a sensorless (without sensor) model for simplified integration into various high-voltage switchgear types.
Technical Specifications
| Item | Unit | Data |
| Rated Voltage | kV | 12 |
| 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 |
| Power Frequency Withstand (to Earth) | kV | 42 |
| Lightning Impulse Withstand | kV | 75 |
Standard Working Conditions
To ensure optimal performance and safety, the following conditions must be met:
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Ambient Temperature: Reliable operation between -10°C and +40°C.
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Altitude: Suitable for installations at altitudes not exceeding 1,000 meters.
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Humidity Limits: Daily average relative humidity ≤ 95%; monthly average ≤ 80%.
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Pollution Degree: Classified as Class II (Class II).
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Environment: Must be free from conductive dust, corrosive gases, severe vibration, and explosive risks.
Selection details for JN15A-12/31.5 Indoor High Voltage AC Grounding Switch
To confirm the required switchgear component configuration for your project, include:
- Exact equipment/model reference, required electrical ratings and operating function
- Installation dimensions, mating interfaces and mechanical/electrical drawings
- Control requirements, operating environment, quantity and destination country
Drawings and quotation requirements
Send the model reference, application, quantity and destination country together with the relevant drawing or existing equipment information. Confirm the selected configuration against a model-specific drawing and ratings sheet before ordering; request the applicable test documentation for your project requirements.
Request model confirmation and a technical quotation · Compare related Earthing Switch / JN15A Earthing Switch.
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