12kv Ring Main Unit Sf6 Gas Insulated Switchgear

Overview 

The gas insulated switchgear powers reliable, automation-ready distribution for 12kV industrial and urban grid projects.This SF6 Ring Main Unit seals all live parts and switching devices inside a 3.0mm-thick stainless steel casing, achieving a lifetime maintenance-free design rated at IP67. Furthermore, this Medium Voltage Switchgear supports both fixed and expandable unit combinations, offering exceptional flexibility for substations with limited space or demanding environmental conditions.

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Operating Conditions

• Temperature Range: -40°C to +40°C.

• Maximum Altitude: ≤2,000 meters.

• Relative Humidity: ≤95% (maximum mean).

• Protection Grade: IP67; SF6 gas pressure 1.4 bar at 20°C; annual leakage rate ≤0.2%/year

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Product Features

• Lifetime Maintenance-Free Sealing：This mv ring main unit encloses all busbars, switches, and live parts in a fully sealed stainless steel chamber filled with SF6 gas, requiring zero scheduled maintenance.

• Full Five-Prevention Interlocking：Every ring main unit integrates a complete five-prevention interlock system that eliminates all equipment and personnel errors caused by human mistakes.

• Flexible Full-Modular Architecture：This Medium Voltage Ring Main Unit combines C (load switch), F (combination apparatus), V (vacuum switch), and CB (circuit breaker) modules in any configuration per substation requirement.

• Safe Pressure Relief Channel：Each SF6 Gas Insulated Switchgear cabinet includes a reliable pressure relief channel that protects operators even under extreme internal fault conditions.

• Smart Automation Integration：This power distribution board supports optional electric operating mechanisms, remote control, and TV-based automation solutions to minimize on-site commissioning workload.

• Extreme Environment Adaptability：This Electrical Switchgear withstands brief water immersion, high humidity, and temperatures as low as -40°C without affecting switching performance.

• Flexible Cable Entry Configuration：All bushings on this power distribution board sit at a uniform height, with the cable room cover interlockable with the ground switch for added installation safety.

Technical Data

		C module	F module	V module		CB module
		Load switch	Combination electric appliance	vacuum switch	Isolation/grounding switch	Direct-air  circuit breaker	Isolation/ grounding switch
Rated Voltage	KV	12	12	12	12	12	12
Rated Frequency	HZ	50	50	50	50	50	50
Power Frequency Withstand Voltage (phase/fracture)	KV	42/48	42/48	42/48	42/48	42/48	42/48
Lightning shock withstand voltage	KV	75/85	75/85	75/85	75/85	75/85	75/85
Rated current	A	630	Note 1	630		1250/630
Breaking ability
Rated closed loop breaking current	A	630
Rated cable charging break current	A	10
Rated short circuit closing current (peak)	A	50	80
Rated peak tolerable current	kA	50
Rated short-time tolerable current	kA/ 3s	20
Rated short circuit breaking current	kA		31.5	20		25
Rated transfer current	A		1700
Use the maximum current of the fuse	A		125
Loop resistance	-n	≤300	≤600
Mechanical life	Times	5000	3000	5000	2000	5000	2000
Note 1:  Depends on the current rating of the fuse.

Main circuit scheme diagram

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