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SRM6-12 Series
Gas-insulated Ring Main Unit Switchgear

SRM6-12 Series Gas-insulated Ring Main Unit Switchgear


SRM6-12 Series Gas-insulated Ring Main Unit Switchgear are widely used in 10KV/20KV power distribution systems. SRM6-12 series adopts modular unit mode. Its units are divided into fixed units (non-expandable) and expandable units. These units can be assembled and combined according to different needs. By choosing an expandable bus, SRM6-12 series can be combined at will to achieve full modularity. Due to its fully modular and semi-modular features, SRM6-12 series is extremely flexible and expandable, which can meet the needs of compact switch cabinets in various substations. SRM6-12 series is a completely sealed system, all live components and circuit breaker switches are enclosed in a stainless steel body, so that the entire switchgear is not affected by external environmental conditions, thereby ensuring operational reliability and personal safety, and achieving long service life (in the rated environment, its design life exceeds 30 years) and maintenance-free.

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Basic Parameters

Rated voltage: 12KV

Rated frequency: 50Hz

Rated normal current: 1250/630A

Rated closed loop breaking current: 630A

Rated cable charging breaking current: 10A

Rated short-circuit making current: 50/80A

Rated dynamic stability current (peak): 50KA

Rated short-time withstand current: 20KA/3s

Rated short-circuit breaking current: 31.5/20/25KA

Rated transfer current: 1700A

Maximum current of fuse: 125A

Circuit Resistance: ≤300μΩ; ≤600μΩ

Mechanical lifetime: 2000/3000/5000 Times


The switchgear is installed on a galvanized sheet frame, and the switch unit is in an SF6 gas tank, which is made of corrosion-resistant and non-magnetic 3mm thick stainless steel plate.

The SF6 gas tank is equipped with a reliable pressure release device to ensure that the gas can be released from the bottom or rear when the pressure is too high, which can guarantee the personal safety of operators even in extreme situations.

The load switch adopts the coaxial rotating double breakpoint method, and the switch can only be in one of the three states of "closed", "opened" and "grounded" at any moment, so it can effectively avoid misoperation.

It has a interlocking device, which prevents casualties and equipment operation failures that may be caused by human misoperation.

The cabinet size is reasonable, easy to install, and can be installed in places with small spaces and poor environmental conditions.

Application Environment

Ambient temperature: -40℃~+40℃

Altitude: ≤2000m

Relative humidity: daily average ≤95%, monthly average ≤90%

Installation site: no severe vibration and impact, and no fire, chemical corrosion, explosion and other dangers.

* If you need to customize according to your special needs, please contact us.

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