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What Is a 24kV Earthing Switch?
A 24kV earthing switch, also known as a grounding switch, is a critical component used in medium voltage power distribution systems to provide a secure grounding path for de-energized equipment. Its primary role is to safely discharge residual voltage and static electricity, ensuring the safety of personnel during maintenance or inspection. The model GPJN15-24/D31.5 offers robust performance for industrial-grade applications with a rated voltage of 24kV and maximum current capacity of up to 100kA.
Grounding switches are typically installed in switchgear assemblies, where they operate in conjunction with circuit breakers and load break switches. This model is specifically designed for three-phase systems and complies with IEC 62271-102, a globally recognized standard for high-voltage switching equipment.
Application Areas
The GPJN15-24/D31.5 earthing switch is widely used in:
- Substations for medium voltage (MV) networks
- Ring Main Units (RMUs) in urban and rural power distribution
- Transformer stations and enclosed switchgear systems
- Industrial plants requiring high reliability and operational safety
Its AC220V / DC110V control voltage allows for seamless integration into both manual and motorized control systems, making it adaptable to modern automation schemes.
Industry Background and Market Trends
The global medium voltage switchgear market, driven by the need for grid modernization, has been experiencing steady growth. According to IEEMA and ResearchAndMarkets, the demand for smart and safe grid infrastructure has led to increased deployment of reliable earthing solutions such as GPJN15-24/D31.5. Additionally, IEEE research underlines the importance of grounding systems in mitigating arc flash hazards and ensuring equipment longevity.
Technical Specifications at a Glance
| Parameter | Specification |
|---|---|
| Rated Voltage | 24 kV |
| Rated Current | 3150 A |
| Maximum Short-Time Current | 40 kA (for 1s) |
| Peak Withstand Current | 100 kA |
| Power Frequency Withstand Voltage | 65 kV (1 min) |
| Lightning Impulse Withstand | 125 kV (1 min) |
| Electrode Count | 3 |
| Pole Distance | ≥200 mm |
| Control Voltage | AC 220V / DC 110V |
| Origin | Zhejiang, China |
| Product Dimensions | 30 x 20 x 30 cm |
| Weight | 5 kg |
| Standard | IEC 62271-102 |
| Type | Load Earthing Switch |
| Intelligent Capabilities | No (Non-smart mechanical device) |
How It Differs from Conventional Products
Compared to legacy earthing switches, the GPJN15-24/D31.5 features:
- Higher short-circuit withstand capability (100kA peak)
- Wider compatibility with modern control voltages
- Compact yet robust mechanical structure for tight switchgear layouts
- Compliance with IEC standards ensures international acceptance
While some grounding switches focus only on basic operation, this model combines safety, efficiency, and adaptability, making it suitable for both traditional and modern MV systems.
Selection Guide: Is This the Right Model for You?
Before purchasing, consider:
- System voltage rating: The GPJN15-24/D31.5 is ideal for 24kV systems.
- Load capacity: With a 3150A rating, it supports heavy industrial loads.
- Short-circuit conditions: If your system may face high fault currents, the 40kA withstand rating provides enhanced protection.
- Automation requirements: AC/DC voltage control enables flexible integration.
Tip: Always ensure your earthing switch matches the short-circuit rating of the entire switchgear assembly to avoid mismatch-induced hazards.
Industry Authority References
For deeper insights on grounding switches and safe grid operation, refer to:
- IEEE Xplore – Grounding Techniques in MV Switchgear
- Wikipedia – Earth Switch
- IEEMA Reports on MV Equipment Market Trends
- ABB and Schneider Electric Catalogs
These sources confirm the rising importance of standard-compliant, high-capacity grounding devices in safe grid design.
Frequently Asked Questions (FAQ)
Answer: An earthing switch connects equipment to ground for safety during maintenance, while a disconnect switch isolates parts of a circuit. Earthing switches typically operate only when circuits are de-energized.
Answer: While the base model is manually operated, the control voltage options (AC220V / DC110V) allow for remote motor operation when fitted with a suitable actuator.
Answer: Check the pole distance (≥200mm), voltage, and short-circuit capacity. Compliance with IEC 62271-102 ensures it will fit most modern systems, but consulting the switchgear manufacturer is always recommended.
The GPJN15-24/D31.5 24kV Earthing Switch is an essential solution for medium voltage system safety, offering high performance, compact design, and international standard compliance. Whether you’re upgrading an old system or designing a new switchgear guide setup, this model is a reliable and cost-effective choice.
Need help with technical selection or OEM supply?
Reach out to our engineering support team or request a detailed datasheet for your specific application.
