Metal Enclosed Low Voltage Switchgear Industrial Grade High Efficiency Maintenance Free 12kv Sf6-Filled Ring Main Unit Gas Insulated System

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Metal Enclosed Low Voltage Switchgear Industrial Grade High Efficiency Maintenance Free 12kv Sf6-Filled Ring Main Unit Gas Insulated System

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Product Description

⚡ Air-Insulated Ring Main Unit (RMU) Overview

Environmentally Friendly Design: This environmentally friendly air-insulated AC metal enclosed switchgear is developed based on power industry trends and years of distribution network experience. It integrates advanced domestic and foreign technologies to provide high-quality, sustainable solutions for distribution networks.

Key Features: Reasonable design, reliable power supply, compact structure, easy installation, flexible operation, small size, and high cost-effectiveness.

Future-Proof: Adhering to green design philosophies, this equipment aligns with the future trend of SF6-free or low-SF6 switchgear requirements.

📜 Executive Standards

GB1984 High-voltage AC Circuit Breaker
GB1985 High-voltage AC Isolating Switch and Grounding Switch
SB3804 3.6kV~40.5kV High-voltage AC Load Switch
GB 3906 Metal-enclosed Switchgear and Control Equipment
GB4208 Ingress Protection (IP code)
DL/T404 3.6kV~40.5kV AC metal-enclosed switchgear
DL/T593 Common technical requirements for high-voltage switchgear

🌍 Normal Operating Conditions

✅ Ambient Temperature: Upper limit +40℃, lower limit -40℃.
✅ Humidity: Daily avg relative humidity ≤95%; Monthly avg ≤90%.
✅ Altitude: Not exceeding 2000m.
✅ Environment: No significant pollution by dust, smoke, corrosive/flammable gases, or salt mist.
✅ Interference: Electromagnetic interference in the secondary system ≤1.6kV.

Applications: Smart grids, urban distribution, building complexes, industrial enterprises, airports, railways, tunnels, and high-rise buildings.

📊 Main Technical Parameters

Project		Unit	Circuit Breaker / Load Switch Unit
Rated Voltage		kV	12
Rated Frequency		Hz	50
Rated Current		A	630
1min Power Frequency Withstand Voltage	Ground, Phase-to-Phase	kV	42
1min Power Frequency Withstand Voltage	Between the Breaks	kV	48
Lightning Impulse Withstand Voltage	Ground, Phase-to-Phase	kV	75
Lightning Impulse Withstand Voltage	Between the Breaks	kV	85
Rated Short-Time Withstand Current		kA	20/4s
Rated Peak Withstand Current		kA	50
Protection Level (Casing / Gas Tank)		-	IP4X / IP67
Cabinet Size (Single Circuit)		mm	420×822×1420

⚙️ Mechanical Characteristics Parameters

Project	Unit	Vacuum Circuit Breaker	Load Switch Unit
Contact Opening Distance	mm	8±1	8±1
Contact Overtravel	mm	3.5±1	3.5±1
Average Opening Speed	m/s	1.2±0.2	1.2±0.2
Average Closing Speed	m/s	0.8±0.2	0.8±0.2
Closing Time	ms	30-70	≤900
Opening Time	ms	18-50	18-50
Mechanical Life	Times	10000	3000

🖼️ Product Detailed Gallery

❓ Frequently Asked Questions

Q1: What are the main benefits of an air-insulated ring main unit? A1: Air-insulated RMUs are environmentally friendly as they reduce or eliminate the use of SF6 gas. They offer a compact design, high reliability, and are easy to maintain and install in urban or industrial environments.

Q2: What is the rated voltage and current for this switchgear? A2: The equipment is designed for distribution systems with a rated voltage of 12kV and a rated current of 630A at a frequency of 50Hz/60Hz.

Q3: Can this equipment operate in extreme weather conditions? A3: Yes, it is designed to operate in ambient temperatures ranging from -40℃ to +40℃ and is suitable for altitudes up to 2000 meters.

Q4: What is the protection rating for the gas tank and casing? A4: The casing features an IP4X protection level, while the gas tank is rated at IP67, ensuring high protection against dust and moisture.

Q5: What are the typical applications for this switchgear? A5: It is ideal for smart grids, urban residential areas, industrial and mining enterprises, airports, railways, tunnels, and high-rise building power systems.

Q6: What is the mechanical life expectancy of the vacuum circuit breaker? A6: The vacuum circuit breaker is tested for a mechanical life of up to 10,000 operations, ensuring long-term durability.