EN
JN15‑12/(D)31.5 & JN15‑24/(D)31.5 Combination Indoor High‑Voltage Earthing Switch
Engineered for indoor medium‑voltage safety, the JN15‑12/(D)31.5 & JN15‑24/(D)31.5 earthing switches deliver superior short‑circuit making performance for switchgear maintenance protection. Offering manual or motor‑driven operation, they conform to GB/T 1985‑2023 and IEC 129. Custom inter‑pole spacing and optional insulating covers or plates enable seamless integration with KYN28, XGN and other mainstream cabinets for substations, industrial facilities and renewable‑energy projects.
- Overview
- Technical Data
- Key Features
- Applications
- Recommended Products
JN15‑12/(D)31.5 & JN15‑24/(D)31.5 combination indoor high‑voltage earthing switches adopt assembled‑type structure, available for manual or electric operation. Compliant with GB/T 1985‑2023 and IEC 129. Suitable for 3‑12 kV / 24 kV three‑phase AC 50/60 Hz indoor power systems, offering reliable short‑circuit making capacity for maintenance grounding protection inside high‑voltage switchgear. Multiple pole‑distance options, optional insulating cover / insulating plate. Engineered to withstand severe fault‑current surges, these units effectively eliminate residual hazardous voltage during equipment overhaul and create a critical safety barrier for on‑site field technicians. The flexible configuration scheme helps switchgear manufacturers simplify cabinet design, reduce secondary modification work and shorten overall project delivery cycles for global power‑distribution contracts.
Product Overview
JN15‑12/(D)31.5 and JN15‑24/(D)31.5 series combination earthing switches are new‑generation indoor high‑voltage earthing devices developed based on the classic ES1 prototype, featuring internationally‑competitive technical performance. Built with modular assembled construction, they fully satisfy GB/T 1985‑2023 High‑Voltage AC Disconnectors and Earthing Switches and IEC 129 standards. Designed for 3‑12 kV and 24 kV three‑phase AC 50(60) Hz indoor power networks, these earthing switches possess sufficient short‑circuit making capacity to safeguard switchgear and internal components against fault damage. They work compatibly with various high‑voltage switchgear assemblies to deliver secure grounding protection during high‑voltage equipment maintenance. Models with suffix D support electric operation; versions without “D” are manual‑operated. Optional accessories include insulating covers or insulating plates, and multiple inter‑pole distance selections to match different cabinet layouts. Every unit undergoes strict factory‑level performance and mechanical endurance testing before shipment to guarantee consistent quality. Whether for new‑build substations, facility retrofits or spare‑part replacement orders, this product line delivers stable long‑term operation, well‑suited for utility plants, industrial workshops, mining sites and new‑energy power‑collection projects worldwide. Complete technical documentation including dimension drawings and test reports can be provided to support tender evaluation and project acceptance for overseas buyers.
Operating Conditions
- Ambient air temperature: Range from −10 °C to +40 °C
- Altitude: Installation site altitude ≤1000 m above sea level
- Humidity: Daily average relative humidity ≤95%; monthly average relative humidity ≤90%
- Seismic resistance: Capable to withstand seismic intensity up to Grade 8
- Pollution class: Suitable for environment of pollution class II
- No severe vibration, explosive gas or corrosive conductive dust in the installation room
Model Code Explanation
- J: Indoor type
- N: Earthing switch
- 15: Product design serial number
- 12: Rated voltage 12kV
- (D): D stands for electric operation; no D means manual operation
- 31.5: Rated short‑time withstand current 31.5kA
- □: Inter‑pole centre distance (customisable pole spacing in mm)
Main Technical Specifications (JN15-12/(D)31.5)
| Item | Unit | Parameter |
|---|---|---|
| Rated Voltage | kV | 12 |
| Rated Short-Time Withstand Current | kA | 31.5 |
| Rated Short-Circuit Duration | s | 4 |
| Rated Peak Withstand Current | kA | 80 |
| Rated Short-Circuit Making Current | kA | 80 |
| 1-min Power-Frequency Withstand Voltage (phase-earth/phase-phase) | kV | 42 |
| Rated Lightning Impulse Withstand Voltage | kV | 75 |
| Mechanical Life | operations | 3000 |
Main Technical Specifications (JN15-24/(D）31.5)
| Item | Unit | Data |
|---|---|---|
| Rated Voltage | kV | 24 |
| Rated Short-Time Withstand Current (Thermal Stability) | kA | 31.5 |
| Rated Short-Circuit Duration | s | 4 |
| Rated Short-Circuit Closing Current | kA | 80 |
| Rated Peak Withstand Current (Dynamic Stability) | kA | 80 |
| Rated Insulation Level | ||
| — Rated Short-Time Withstand Voltage at Power Frequency | kV | 68 |
| — Rated Lightning Impulse Withstand Voltage | kV | 125 |
| Mechanical Life | operations | 3000 |
Modular assembled construction: The whole unit adopts split assembled design. Individual components can be replaced separately, simplifying field installation, commissioning, inspection and later maintenance work. The robust mechanical structure guarantees stable performance under longterm continuous operation inside switch rooms.
Two operation modes for flexible selection: Basic models support manual spring operation for simple local control. The (D) variant comes with an integrated electric drive mechanism, enabling remote or automatic operation to fit automated power distribution systems and smart grid projects.
Outstanding shortcircuit withstand performance: The product is rated with 31.5kA rated shorttime withstand current and 80kA peak shortcircuit making current. It can endure instantaneous high fault current without permanent deformation or functional failure, delivering solid protection for the whole switchgear set.
Customisable configuration: Multiple interpole spacing selections adapt to different cabinet designs. Customers may select or omit insulating covers and insulating plates according to local electrical safety specifications and project requirements.
High mechanical reliability: Optimised transmission mechanism reduces friction and mechanical wear. The mechanical service life reaches up to 3000 operation cycles, suitable for frequent switching operations in industrial and utility power stations.
Global standard compliance: Verified against GB/T 1985‑2023 and IEC 129. Test reports and certification documents can be fully supplied for formal tender submission and comprehensive engineering due diligence for overseas B2B buyers working on cross‑border power and switchgear infrastructure projects.
Perfectly matched with KYN28, XGN and other indoor metal‑clad switchgear cabinets, these earthing switches serve as critical safety components, mitigating residual voltage risks during equipment overhaul and helping operators comply with local power‑grid safety regulations. Widely adopted for:
- Medium‑voltage power substations
- Industrial power distribution rooms
- Power plants & mining project switch‑rooms
- Commercial building MV distribution systems
- Renewable energy collector‑station switchgears
Additional Order & Documentation Notes
- Custom inter‑pole distances are available to fit diverse cabinet layouts.
- Please specify pole spacing, with‑or‑without insulating cover/plate, manual or electric drive when placing orders.
- Drawings, test reports and dimensional documents can be provided upon request.
- Supporting materials assist tender reviews, cabinet design validation and on‑site project acceptance for global switchgear integrators and end‑users.
