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NXT-12 C-GIS SF6-Free Insulated Switchgear

NXT-12 C-GIS SF6-Free Insulated Switchgear
NXT-12 C-GIS SF6-Free Insulated Switchgear
NXT-12 C-GIS SF6-Free Insulated Switchgear

The 12kV switchgear features a compact, high-capacity design with an IP67 fully sealed gas tank, providing reliable performance in harsh operating environments. As an advanced medium voltage switchgear, it adopts gas insulation technology to ensure excellent safety, stability, and low maintenance. This GIS gas insulated switchgear is ideal for renewable energy systems and other medium voltage power distribution applications.

SF6-Free
Max. 2500 A
Four remote functions
40 kA breaking capacity
IP67 stainless steel gas tank
Internal Arc Classification (IAC) arc fault protection
Model:NXT-12
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Key Benefits

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SF6-Free Insulation
The SF6-free design of this gas insulated switchgear eliminates greenhouse gas emissions and supports low-carbon operation throughout its lifecycle. As an eco-friendly medium voltage switchgear, it delivers sustainable performance for modern power distribution systems.
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IP67 Sealed Gas Tank
The 3 mm 304 stainless steel gas tank features laser welding and helium leak detection, ensuring high sealing performance with a pressure differential ≤0.04 MPa. This GIS gas insulated switchgear delivers reliable and stable operation for 12kV medium voltage applications.
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High Current & Breaking Capacity
This 12kV GIS gas insulated switchgear delivers a rated current up to 2500A and short-circuit breaking current up to 40kA for safe and reliable medium voltage power distribution.
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Dual Safety Interlocking
The GIS gas insulated switchgear features mechanical five-prevention interlocking and electrical locking systems, enabling closed-door operation and enhanced personnel safety in 12kV medium voltage applications.

Product Overview

NXT-12 Cubicle Gas-Insulated Switchgear (C-GIS) is a 12 kV compact, high-capacity environmentally friendly gas-insulated metal-enclosed switchgear independently developed by NATUS Electrical Group. It integrates a vacuum circuit breaker and a direct-acting isolating switch mechanism, uses SF6-free environmentally friendly gas as the insulating medium, and uses the vacuum circuit breaker for breaking and arc extinguishing.
Compared with traditional air-insulated switchgear, this 12 kV C-GIS gas-insulated switchgear seals all high-voltage live components inside an IP67 stainless steel gas tank, enabling stable operation in harsh environments such as humidity, sandstorms, high dust, heavy pollution and containerized substations. The modular structure supports flexible assembly and future expansion, with a maximum rated current of 2500 A and a rated short-circuit breaking current of 40 kA. The GIS gas insulated switchgear supports both electric and manual operation modes, integrates four remote functions, and is compatible with distributed and centralized control systems.
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Product Structure

gis gas insulated switchgear
Equipped with dual protection functions including mechanical five-prevention interlocking and electrical locking. When the circuit breaker is in the closed position, electric or manual operation of the three-position switch is prohibited.
This product employs a direct-acting isolating switch structure to ensure stable closing operation. Conductive components feature a graded design: spring-loaded contact fingers for rated currents of 1250A and below, and strip-type contact fingers for 2500A and above.
gis gas insulated switchgear

Technical Advantages

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Simulation-optimized electrical and mechanical design
The GIS gas insulated switchgear adopts ANSYS electric-field optimization and finite element mechanical analysis to ensure reliable performance and long service life.
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Full-process 100% quality inspection
All insulation components and finished 12kV switchgear units undergo partial discharge testing, while gas tanks are verified through helium leak detection for high sealing reliability.
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Flexible modular and intelligent design
The medium voltage switchgear supports independent or integrated bay configurations, flexible installation options, four-remote control functions, and communication protocols including Modbus and IEC 61850.

Technical Specifications

Core Electrical Parameters


Basic Parameters
Rated voltageUr12kV-
Rated frequencyfr50/60HzDual-frequency compatibility
Rated power-frequency withstand voltageUd42/48kVPhase-to-ground / phase-to-phase
Rated lightning impulse withstand voltageUp75/85kVPhase-to-ground / phase-to-phase
Rated busbar currentIr3150ASupports circuit breaker cubicles up to 2500 A
Rated current / operating current-3150AFrom technical specification image
Rated short-time withstand currentIk25/31.5/40kADuration: 4 s
Rated short-circuit periodtk4sFrom technical specification image
Rated impulse currentIp (50 Hz)63/80/100kACorresponding to 25/31.5/40 kA short-time withstand current



Internal Arc Classification (IAC) Arc Fault Qualification


Basic Parameters
Degree of accessibilityAFLR-
Arc fault test current25/31.5/40kA
Duration of arc fault test current1s



Dimensions and Protection


Basic Parameters
Cubicle height2300 mm-
Cubicle depth950 mm-
Circuit breaker cubicle width500/600 mm (630 A/1250 A); 800 mm (2500 A)By rated current
External enclosure protection ratingIP4X-
Gas compartment protection ratingIP67Fully dustproof and protected against temporary immersion
Gas compartment material3 mm 304 stainless steelLaser static sealing welding
Loss of service continuity classLSC1 (default)LSC2 customizable



Applicable Standards


Basic Parameters
GB/T 3906-2020AC metal-enclosed switchgear and controlgear for rated voltages above 3.6 kV and up to 40.5 kV
GB/T 11022-2020Common specifications for high-voltage switchgear and controlgear standards
GB/T 1984-2024High-voltage alternating-current circuit breakers
State Grid requirementsState Grid standardization requirements and the 18 major anti-accident measures

Application
新能源
工业行业
市政商业

Product FAQ

The gas tank is designed for more than 30 years of service life. Under normal operation, regular gas refilling is not required.
It meets State Grid standardization requirements and the 18 major anti-accident measures, and can be used in distribution projects that require these standards.
It provides 25 kA/31.5 kA/40 kA short-circuit breaking levels and 630 A/1250 A/2500 A current levels, with options such as LSC2 gas tank and special protection class.
Modbus, IEC 61850 and other mainstream communication protocols are supported, enabling connection to distribution automation systems.
The lead time for standard configurations is generally 4–6 weeks, while customized products are generally 6–8 weeks depending on scope.

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Need customized configurations, CAD drawings, or a competitive price for this product? Submit your project requirements and our engineering team will get back to you within 24 hours.
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    Email: icd@natus-cn.com
    Tel: 400-928-1888
    Add: No. 369, Labor East Road, Tianning District, Changzhou City, Jiangsu Province
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