JUBANG Group’s Advanced Power Distribution Solution
Executive Summary
In modern urban distribution networks, industrial parks, wind power projects, and other critical infrastructure, power supply reliability and operational safety are non-negotiable. As a National High-Tech Enterprise and a specialized “Little Giant” enterprise supported by China’s Ministry of Industry and Information Technology, JUBANG Group Co., Ltd. leverages over 30 years of industry expertise to introduce the GT-SRM-12 SF6 Gas-Insulated Ring Main Unit (RMU).
Featuring fully insulated, maintenance-free performance, combined with modular design and rigorous manufacturing standards, the GT-SRM-12 provides customers worldwide with an intelligent, compact, and highly reliable medium-voltage power distribution solution.
1.Core Structural Advantage: Fully Sealed Gas Tank Design for Unrestricted Environmental Operation
All primary live components—including load break switches, circuit breakers, and earthing switches—are enclosed within a stainless-steel gas tank filled with SF6 insulating gas at rated pressure.
This fully insulated and fully sealed structure effectively eliminates the impact of external environmental factors such as:
- Condensation and humidity
- Dust and pollution
- Altitude variations
- Small animal intrusion
The gas tank is manufactured using fully automated robotic continuous laser welding and undergoes comprehensive helium mass spectrometer leak testing to ensure extremely low annual gas leakage rates.
Whether operating in the humid coastal regions of Southeast Asia or the dusty industrial environments of the Middle East, the GT-SRM-12 maintains stable performance, making it an ideal solution for cable ring networks and terminal power distribution applications.
2.Five Key Technical Advantages
2.1 Maximum Safety with Maintenance-Free Operation Throughout Its Service Life
- Gas tank enclosure protection rating: IP67
- Complete protection against dust ingress and temporary immersion in water
- Eliminates common air-insulated switchgear issues such as flashover and surface tracking
- Designed service life: ≥20 years
- No need for gas replenishment or internal inspection under normal operating conditions
- Particularly suitable for remote areas where maintenance resources are limited and service costs are high
- Significantly reduces total lifecycle investment and maintenance expenses
- External enclosure protection rating: IP4X, ensuring operator safety and protection against accidental impacts during installation
2.2 Flexible Modular Configuration
The GT-SRM-12 adopts a modular design philosophy, allowing independent production and rapid on-site assembly of functional units to meet diverse distribution requirements.
Available Functional Modules
C Unit (Load Break Switch Unit)
- For normal load switching operations
- Ring network interconnection applications
F Unit (Fuse Combination Unit)
- Equipped with current-limiting fuses
- Suitable for transformer protection up to 1250 kVA
V Unit (Vacuum Circuit Breaker Unit)
- Provides rated short-circuit breaking capability
- Used for feeder protection and relay coordination
M Unit (Metering Unit)
- Designed for electrical energy measurement and monitoring
Expansion Options
- Side busbar extension
- Top busbar extension
The number of incoming and outgoing feeder units can be freely adjusted according to project requirements.
With a cabinet width of only 360–500 mm, the GT-SRM-12 occupies significantly less space than conventional air-insulated switchgear, making it ideal for:
- Compact substations
- Prefabricated cabins
- Space-constrained installations
2.3 Reliable Mechanical Interlocking and Comprehensive Five-Prevention Protection
The unit incorporates a dependable mechanical interlocking system that fully complies with the industry-standard “Five Prevention” requirements:
- Prevention of incorrect opening or closing of circuit breakers
- Prevention of operating disconnectors under load
- Prevention of closing the earthing switch on an energized circuit
- Prevention of energizing a circuit while the earthing switch is engaged
- Prevention of unauthorized access to live compartments
Even in multinational construction environments with varying operational practices, mechanical interlocks provide mandatory safety protection against human error.
2.4 Broad Electrical Parameter Compatibility
The GT-SRM-12 is designed to meet the requirements of diverse power systems worldwide.
Electrical Ratings
- Rated frequency: 50 Hz / 60 Hz
- Rated current: 630 A / 1250 A
- Short-time withstand current:
Performance parameters including power-frequency withstand voltage and lightning impulse withstand voltage fully comply with:
SF6 Gas Parameters
- Rated filling pressure (20°C, gauge pressure): 03–0.045 MPa
- Annual gas leakage rate: ≤0.01%
Every unit undergoes comprehensive factory testing, including:
- Power-frequency withstand testing
- Partial discharge testing
- Gas-tightness testing
2.5 Exceptional Application Versatility
The compact design enables deployment across a wide range of domestic and international infrastructure projects:
- Municipal power distribution networks
- Commercial complexes
- High-rise buildings
- Residential substations and switching stations
- Renewable energy plants
- Onshore wind farms
- Utility-scale photovoltaic collection and step-up stations
- Major infrastructure developments
- Airports
- Intercity rail transit systems
- Highway power supply networks
- Petrochemical facilities
- Mining operations
- Refineries
- Metallurgical plants
- Heavy industrial distribution systems
3.JUBANG Manufacturing Excellence: A Reliable Partner for Global Projects
JUBANG Group Co., Ltd. has established long-term strategic partnerships with major power utilities and has been recognized as both a National Specialized “Little Giant” Enterprise and a National Green Factory.
Choosing JUBANG means choosing:
Advanced Manufacturing Capability
State-of-the-art CNC production equipment and automated robotic welding lines ensure exceptional gas tank sealing precision and product consistency.
Global Compliance
Products are designed in accordance with international IEC standards and are fully capable of meeting the stringent requirements of overseas power grids.
Commitment to Sustainability
In addition to highly reliable SF6-insulated RMUs, JUBANG has independently developed and mass-produced the GT-HRM-12 environmentally friendly gas-insulated ring main unit.
This enables support for:
- Carbon-neutral infrastructure projects
- SF6-free green power distribution systems
- Sustainable energy developments
Customers can choose between conventional SF6-insulated and environmentally friendly gas-insulated solutions through a single trusted supplier.
About JUBANG Group Co., Ltd.
Founded in 1993, JUBANG Group specializes in power distribution equipment up to 35 kV, energy storage systems, and intelligent operation & maintenance services. The company is dedicated to delivering safe, efficient, and sustainable electrical solutions to power users worldwide.
JUBANG 
