Dongfa Intelligent supplies the JN15-12 series 12kV Indoor Earthing Switch for switchgear builders and power engineering procurement teams. It is rated for 31.5kA/4s short-time withstand current, 80kA short-circuit making current, 80kA peak withstand current, 42kV power-frequency withstand voltage, and 75kV lightning impulse withstand voltage. Mechanical life is 2,000 operations. Phase spacing options are 210mm, 230mm, 250mm, and 275mm. Creepage distance is 300mm or 380mm depending on configuration.
For the 12kV Indoor Earthing Switch, the closed-state thermal stability current tests the continuous current-carrying capacity of the conductive loop. Copper bar cross-section determines temperature rise during the 4-second test. Silver plating thickness determines contact resistance stability under oxidation and wear. Both are controlled during production to keep temperature rise within safe limits.
The 80kA peak making current tests contact pressure and spring stiffness at the moment of closing. Insufficient contact pressure can cause electrodynamic repulsion, contact bounce, or welding. Insufficient spring stiffness can prevent the contacts from maintaining pressure after closing. Spring stiffness and contact pressure are calculated to withstand 80kA peak current without welding or bouncing.
Each earthing switch undergoes circuit resistance testing and mechanical operation testing before shipment. Circuit resistance testing verifies conductive loop contact quality. Mechanical operation testing verifies contact pressure and spring stiffness. Together they confirm 31.5kA thermal stability and 80kA dynamic stability requirements.
The 12kV Indoor Earthing Switch is available in four phase spacing options: 210mm, 230mm, 250mm, and 275mm. Selection must match the switchgear busbar arrangement.
| Model | L (mm) | E (mm) | C (mm) |
| JN15-12/31.5-210 | 655 | 210 | 516 |
| JN15-12/31.5-230 | 710 | 230 | 556 |
| JN15-12/31.5-250 | 760 | 250 | 596 |
| JN15-12/31.5-275 | 810 | 275 | 646 |
| Parameter | Specification |
| Product Type | Indoor Earthing Switch |
| Product Series | JN15-12 |
| Rated Voltage | 12kV |
| Rated Short-Time Withstand Current (Thermal Stability) | 31.5kA |
| Rated Short-Circuit Duration | 4s |
| Rated Short-Circuit Making Current | 80kA |
| Rated Peak Withstand Current (Dynamic Stability) | 80kA |
| 1 min Power-Frequency Withstand Voltage | 42kV |
| Rated Lightning Impulse Withstand Voltage | 75kV |
| Phase Spacing Options | 210 / 230 / 250 / 275mm |
| Creepage Distance | 300mm / 380mm (confirm by configuration) |
| Mechanical Life | 2,000 operations |
Confirm the following for the 12kV Indoor Earthing Switch:
The JN15-12 series 12kV Indoor Earthing Switch is used in the following applications:
Requiring maintenance safety.
Including solar and wind power collection systems.
With phase spacing from 210mm to 275mm.
For existing 12kV switchgear with non-standard phase spacing.
Where 80kA making current and 31.5kA/4s thermal stability are specified.
The JN15-12 series 12kV Indoor Earthing Switch is manufactured to meet GB and IEC 62271 requirements. The factory operates under ISO 9001, ISO 14001, and ISO 45001 certified management systems and maintains CNAS/IAF recognized testing capability. These standards and certifications apply to the production and inspection of the earthing switch, not to a single sample.
Every unit undergoes full inspection, not sampling. The inspection includes:
Products have been exported to Southeast Asia and parts of Europe, adapting to different market standards and requirements.
Earthing switches are produced on a dedicated line separate from main switch lines. Copper bar processing, contact silver plating, spring assembly, and mechanism adjustment each have independent workstations and fixed process parameters. This supports stable batch consistency.
Every 12kV Indoor Earthing Switch unit passes resistance test, mechanical operation test, withstand voltage test, and vacuum degree inspection before shipment. Test records are traceable and available upon request. Certifications include ISO 9001, ISO 14001, and ISO 45001, with CNAS/IAF recognized testing capability.
The dedicated line supports small-batch flexible scheduling. Standard products support MOQ 1 unit. Four phase spacings can be switched on the same line. Technical response within 1 working day; after-sales response within 24 hours.
Every unit must pass resistance test, mechanical operation test, withstand voltage test, and vacuum degree inspection before shipment. This is full inspection, not sampling. Test records are traceable and available upon request.
Creepage distance is confirmed by configuration. Confirm 300mm or 380mm based on project pollution level before ordering.
The technical team responds within 1 working day. After-sales response is within 24 hours.
Yes. The dedicated earthing switch line supports small-batch flexible scheduling. Four phase spacings (210mm, 230mm, 250mm, 275mm) can be quickly switched on the same line. Standard products support MOQ 1 unit.
The 210mm, 230mm, 250mm, and 275mm phase spacings cover mainstream switchgear designs. Replacement projects only need to confirm the original phase spacing for selection.
Products have been exported to Southeast Asia and parts of Europe, adapting to different market standards and requirements.
The factory is certified to ISO 9001, ISO 14001, and ISO 45001, with CNAS/IAF recognized testing capability.
Address
No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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