Indoor HV Earthing Switches (12kV – 40.5kV)
XBRELE’s Earthing Switches (JN15 & EK6 Series) provide reliable safety grounding for KYN28/KYN61 switchgear. Featuring robust short-circuit making capacity up to 80kA (peak) and full compliance with IEC 62271-102 standards.
Critical Safety Interface for Medium Voltage Networks
[cite_start]XBRELE JN15 and EK6 Series serve as the definitive personnel protection interface within distribution cabinets[cite: 1359, 1360]. [cite_start]These indoor mechanical devices establish a solid, visible connection to earth for 12kV, 24kV, and 40.5kV systems, enabling safe access during maintenance intervals[cite: 1399, 1491].
[cite_start]Engineered for fault tolerance, our make-proof safety units feature a rapid spring-operated mechanism capable of handling peak currents up to 80kA[cite: 1377]. This robust construction guarantees mechanical integrity even if closed onto a live fault, containing potential arc energy to protect operators.
Fully compliant with IEC 62271-102 Standards [cite_start], these switchgear components offer Class M1 mechanical endurance[cite: 1386]. [cite_start]They are designed for precise integration with chassis interlocks in KYN28 and KYN61 panels, preventing accidental operation while the main circuit is live[cite: 1399, 1491].
For VCB chassis, insulators, and other MV accessories, please visit our main Switchgear Parts & Accessories pillar page .
Indoor Earthing Switch Specifications
Full range of grounding switches (12kV to 40.5kV) compliant with IEC 62271-102. Select a series below to view detailed electrical ratings and complete dimension tables.
JN15-12/31.5 Technical Overview
The JN15-12 series is an advanced indoor grounding switch meeting GB1985-2004 and IEC 62271-102 standards. Designed for 3~12kV three-phase AC systems.
It features high short-circuit making capability (80kA peak) to protect equipment against accidental energization.
The table below summarizes the rated electrical parameters.
Main technical parameters — JN15-12
| No. | Item | Unit | JN15-12/31.5 |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated short-time withstand current (4s) | kA | 31.5 |
| 3 | Rated short-circuit making current (peak) | kA | 80 |
| 4 | Rated peak withstand current | kA | 80 |
| 5 | Rated insulation level (PF/Lightning) | kV | 42 / 75 |
| 6 | Mechanical life | Times | 2,000 |
Mounting Dimensions & Phase Spacing
| Model Code | Phase Spacing (E) | Overall Width (H) | Mounting (F) | Mounting (G) | Mounting (D) |
|---|---|---|---|---|---|
| JN15-12/31.5-165 | 165 mm | 565 mm | 75 mm | 160 mm | 426 mm |
| JN15-12/31.5-180 | 180 mm | 595 mm | 75 mm | 160 mm | 456 mm |
| JN15-12/31.5-200 | 200 mm | 635 mm | 75 mm | 160 mm | 496 mm |
| JN15-12/31.5-210 | 210 mm | 655 mm | 75 mm | 160 mm | 516 mm |
| JN15-12/31.5-220 | 220 mm | 675 mm | 75 mm | 160 mm | 536 mm |
| JN15-12/31.5-230 | 230 mm | 695 mm | 75 mm | 160 mm | 556 mm |
| JN15-12/31.5-250 | 250 mm | 735 mm | 75 mm | 160 mm | 596 mm |
| JN15-12/31.5-275 | 275 mm | 810 mm | 75 mm | 185 mm | 646 mm |
EK6-12/31.5 Compact Series
The EK6-12 series is designed based on the ES1 prototype grounding switch. It features a simplified assembly structure while maintaining full compliance with GB1985-2004 and IEC129 requirements.
This model is ideal for compact switchgear designs or retrofitting projects where an ES1-style footprint is required. It provides the same robust 31.5kA protection as the JN15 series.
See technical specifications below.
Main technical parameters — EK6-12
| No. | Item | Unit | EK6-12/31.5 |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated short-time withstand current (4s) | kA | 31.5 |
| 3 | Rated short-circuit making current | kA | 80 |
| 4 | Rated peak withstand current | kA | 80 |
| 5 | Mechanical life | Times | 2,000 |
| 6 | Structure Type | – | Assembly (ES1 Based) |
Installation Note
EK6-12 is typically available in standard phase spacings (e.g., 210mm) similar to the JN15 series. Please verify mounting interface compatibility with ES1-type designs before ordering.
JN15-24/31.5 Technical Overview
The JN15-24/31.5 is an upgraded version developed on the basis of the JN15-12. It maintains the same compact installation dimensions while providing insulation levels suitable for 24kV power systems.
Suitable for KYN28-24 switchgear, it ensures operator safety during maintenance with a robust short-circuit closing capability of 80kA.
Refer to the table below for insulation levels and current ratings.
Main technical parameters — JN15-24
| No. | Item | Unit | JN15-24/31.5 |
|---|---|---|---|
| 1 | Rated voltage | kV | 24 |
| 2 | Rated short-time withstand current (4s) | kA | 31.5 |
| 3 | Rated short-circuit making current | kA | 80 |
| 4 | PF withstand voltage (1 min) | kV | 65 |
| 5 | Lightning impulse withstand voltage | kV | 125 |
| 6 | Mechanical life | Times | 2,000 |
Mounting Dimensions (24kV)
| Model Code | Phase Spacing (E) | Overall Width (H) | Mounting (D) | Mounting (C) |
|---|---|---|---|---|
| JN15-24/31.5-210 | 210 mm | 655 mm | 516 mm | 96 mm |
| JN15-24/31.5-220 | 220 mm | 675 mm | 536 mm | 96 mm |
| JN15-24/31.5-230 | 230 mm | 695 mm | 556 mm | 96 mm |
| JN15-24/31.5-250 | 250 mm | 735 mm | 596 mm | 96 mm |
| JN15-24/31.5-275 | 275 mm | 810 mm | 646 mm | 96 mm |
JN22-40.5/31.5 Technical Overview
The JN22-40.5 is a high-performance grounding switch developed by the Xi’an High Voltage Apparatus Research Institute. It is specifically designed for 40.5kV AC 50Hz power systems.
Compatible with KYN61-40.5 cabinets, it serves as critical grounding protection during equipment overhaul. It features a robust structure to handle the larger clearance requirements of 35kV/40.5kV systems.
Suitable for environments without flood, explosion hazards, or severe dust.
Main technical parameters — JN22-40.5
| No. | Item | Unit | JN22-40.5/31.5 |
|---|---|---|---|
| 1 | Rated voltage | kV | 40.5 |
| 2 | Rated short-time withstand current (4s) | kA | 31.5 |
| 3 | Rated short-circuit making current | kA | 80 |
| 4 | Rated peak withstand current | kA | 80 |
| 5 | Lightning impulse withstand voltage | kV | 185 |
| 6 | Application Cabinet | Type | KYN61-40.5 |
Phase Spacing Dimensions (40.5kV)
| Model Code | Phase Spacing (E) | Overall Width (H) |
|---|---|---|
| JN22-40.5/31.5-280 | 280 mm | 750 mm |
| JN22-40.5/31.5-300 | 300 mm | 790 mm |
| JN22-40.5/31.5-350 | 350 mm | 890 mm |
| JN22-40.5/31.5-400 | 400 mm | 990 mm |
Core Technologies of XBRELE Grounding Series
Safety is paramount in MV power distribution. XBRELE High Voltage Grounding Switches are engineered with high short-circuit making capacity to protect personnel and equipment. Our products fully comply with IEC 62271-102 standards. For more details on compatible cabinets, visit our Switchgear Parts pillar page .
High Short-Circuit Making Capacity
The most critical feature of a maintenance grounding switch is its ability to close safely onto a live fault. We ensure maximum operator protection.
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[cite_start]
- 80kA Peak Making: Robust snap-action mechanism ensures safe closing even against peak short-circuit currents up to 80kA[cite: 1377, 1380]. [cite_start]
- 31.5kA/4s Thermal Stability: Heavy-duty copper contacts withstand thermal stress for 4 seconds during fault conditions[cite: 1371, 1374].
- Arc Fault Containment: Prevents catastrophic failure in case of accidental operation on live circuits.
Mechanical Endurance (Class M1)
Designed for frequent operation in distribution substations, our JN15 series utilizes advanced spring mechanisms for consistent performance.
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[cite_start]
- 2,000 Operations: Verified mechanical life ensures long-term service with minimal maintenance requirements[cite: 1386].
- Advanced Resin Insulators: Uses high-strength epoxy resin insulators (APG technology) to support the conductive path.
- Silver-Plated Contacts: Reduces contact resistance and prevents oxidation, ensuring a reliable earth connection.
Smart Interlocks & Monitoring
Our indoor MV grounding devices are designed to integrate seamlessly into modern smart switchgear environments (KYN28/Unigear).
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[cite_start]
- Voltage Indication (VPIS): Integrated sensors connect to DXN display devices to visually confirm “No Voltage” before earthing[cite: 1352].
- Remote Operation Ready: Compatible with electric motor operators for automated grid management.
- Mechanical Interlocks: Foolproof design prevents closing the switchgear earthing mechanism when the circuit breaker is closed.
Manufacturing & Testing of HV Safety Components
Reliability is non-negotiable for safety devices. XBRELE employs a rigorous 5-stage assembly and calibration process to ensure every JN15 unit meets the strict mechanical endurance and short-circuit capability requirements of IEC standards.
Precision Assembly & Calibration
Unlike static components, this mechanical device requires precise calibration of spring tension and contact alignment to guarantee snap-action performance during critical faults.
- 01
Material Inspection
Copper blades and contacts are tested for conductivity (%IACS) to ensure they can handle high thermal stress (31.5kA) without overheating.
- 02
Spring & Mechanism Assembly
The operating springs are calibrated to provide the exact torque required for high-speed closing, independent of operator speed.
- 03
Alignment Verification
Technicians adjust the phase distance and blade trajectory to ensure perfect alignment with the static contacts on the busbar system.
- 04
Mechanical Operation Test
Every switch assembly undergoes 50 cycles of open/close operations to verify smooth mechanical action and interlock functionality.
- 05
Loop Resistance Measurement
A micro-ohm resistance test is conducted across the conductive path to ensure minimal power loss and stable electrical connection.
Routine & Type Tests
We strictly adhere to IEC 62271-102 protocols. Each safety component is verified for mechanical life and short-circuit making capability before dispatch.
Mechanical Reliability
- Endurance Test: Validated for 2,000 mechanical operations (Class M1).
- Operating Force: Closing and opening torque is measured to ensure ease of operation for maintenance personnel.
- Interlock Check: Verification of mechanical interlocks to prevent misoperation.
Electrical Performance
- Short-Circuit Making: Tested to withstand peak currents up to 80kA without contact welding.
- Thermal Stability: Rated for 4 seconds at 31.5kA (or specified current) to verify thermal capacity.
- Insulation Level: Power frequency withstand voltage test performed on the supporting insulators.
Final Inspection
- Visual check of silver plating on contact surfaces.
- Verification of mounting dimensions (Phase spacing E, Mounting F).
- Torque check on all terminal bolts.
Global Supply for MV Safety Components
XBRELE ensures rapid delivery of JN15 & EK6 assemblies to panel builders worldwide. We coordinate dimension customization, soft connection sizing, and secure export packaging to support urgent KYN28 production and retrofit projects.
Stock Availability for JN15 Series
We maintain a strategic inventory of common specifications (like 210mm and 275mm phase spacing) to minimize downtime for cabinet maintenance.
- In-Stock Items: Ship within 3-5 days for standard 12kV units (210mm spacing). [cite: 1350]
- Bulk OEM Orders: 15-20 days production lead time for large batches.
- Spare Parts: Individual copper braids and sensor insulators available.
- Sample Policy: Express delivery for dimension verification.
Tailored Fit for Special Cabinets
Beyond standard catalogs, XBRELE offers customization for non-standard HV mechanical requirements, ensuring seamless integration.
- Phase Distance: Custom shaft lengths for non-standard busbar widths (e.g., 180mm, 230mm). [cite: 1350]
- Soft Connections: Standard length is 240mm; custom lengths available upon request. [cite: 1352]
- Sensor Integration: Optional pre-installed capacitive sensors for live display devices. [cite: 1352]
- Operating Side: Configurable drive mechanism positioning.
Secure Transport for Mechanical Parts
Heavy-duty switchgear accessories require robust protection. We use reinforced plywood cases to prevent damage to the operating shaft and insulators during transit.
- Plywood Crating: Heavy-duty, fumigation-free wooden cases for sea/air freight.
- Shaft Protection: Drive shafts are secured to prevent bending or misalignment.
- Moisture Control: Desiccant packs and plastic wrapping for rust prevention.
- Documentation: COC, Test Reports, and Installation Manuals included.
Common Questions About MV Safety Devices
Technical answers regarding JN15/EK6 selection, short-circuit capabilities, mechanical interlocks, and installation compatibility with KYN28 switchgear cabinets.