Gold Member Since 2017
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Wenzhou Unisun Electric Co., Ltd.

Ring Main Unit, Switchgear, Electrical Switchgear manufacturer / supplier in China, offering Air Insulation Electrical Switchgear Ring Main Unit, Fix Version 0.4kv Electric Power Distribution Cabinet Low Voltage Switchgear, 33kv Draw-out Type Air Insulation Metal Enclosed Switch Cabinet and so on.

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Air Insulation Electrical Switchgear Ring Main Unit

FOB Price: US $1,000 / Set
Min. Order: 1 Set
Min. Order FOB Price
1 Set US $1,000/ Set
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Port: Ningbo, China
Production Capacity: 50000
Payment Terms: L/C, T/T, Western Union, Paypal, Money Gram

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Basic Info
  • Model NO.: iUN-panel
  • Shell Material: Steel Plate
  • Installation: Fixed
  • Current: AC
  • Transformer off Load: 16A
  • Trademark: UNISUN
  • Specification: 12KV/24KV
  • HS Code: 8535210000
  • Certification: VDE, CCC, ISO9001
  • Voltage Level: Medium Voltage
  • Structure: Embedded
  • Rated Voltage: 7.2kv, 12kv, 17.5kv, 24kv
  • Cables off Load: 31.5A
  • Transport Package: Wooden
  • Origin: China
Product Description
The Unisun enjoy more than 16 year experience manufacture SF6 Ring main Unit in china, we import first APG line from Germany to localized air pressure guage production craft, our APG manufacturing including SF6 switch disconnector, embedded pole and etc epoxy resin insulation parts. iUN-panel units are used for the MV section in MV/LV transformer substations in public distribution systems and MV consumer or distribution substations up to 24 kV.
The iUN-panel range is made up of modular units containing metal-enclosed SF6 switchgear, using Sulphur hexafluoride (SF6) or vacuum:
  • switch-disconnector;
  • iVD4S vacuum circuit breaker;
  • Vacuum contactor;
  • disconnector.
Unit definitions
Below is the list of iUN-panel range units used in MV/LV transformer substations and industrial distribution substations:
  • IM, IMC, IMB switch;
  • PM fused switch;
  • QM, QMC, QMB fuse-switch combination;
  • CRM contactor and contactor with fuses;
  • DM1-A, DM1-D, DM1-S single-isolationSF6 type circuit breaker;
  • DMV-A, DMV-D, DMV-S single-isolation vacuum type circuit breaker;
  • DM1-W, DM1-Z withdraw able single-isolationSF6 type circuit breaker;
  • DM2 double-isolation SF6 type circuit breaker;
  • CM, CM2 voltage transformers;
  • GBC-A, GBC-B current and/or voltage measurements;
iUN-panel units meet all the following recommendations, standards and specifications:
  • IEC:60694:
  • IEC62271-200
  • IEC60265
  • IEC60420
  • IEC60255
  • IEC62271-100
  • IEC62271-102
iUN-panel units are identified by a code including:
  • an indication of the function, i.e. the electrical diagram code: IM, QM, DM1, CM, DM2, etc.
  • the rated current: 400 - 630 - 1250 A;
  • the rated voltage: 7.2 - 12 - 17.5 - 24 kV;
  • the maximum short-time withstand current values: 12.5 - 16 - 20 - 25 kA.1 s;
  • the color is of RAL 9002 type (frosted satin white).
Example for a unit designated: IM 400 - 24 - 12.5
  • IM indicates an "incoming" or "outgoing" unit;
  • 400 indicates the rated current is 400 A;
  • 24 indicates the rated voltage is 24 kV;
  • 12.5 indicates the short-time withstand current is 12.5 kA.1 s.
The hereunder values are for working temperatures from -5°C up to +40°C and for a setting up at an altitude below 1000 m.
Internal arc withstand:
  • standard:12.5 kA. 0.7 s;
  • enhanced:16 kA. 1 s.
Protection index:
  • units: IP2XC (IP3X consult us);
  • between compartments: IP2x.
Electro-magnetic compatibility:
  • relays: 4 kV withstand capacity, as per recommendation IEC 60801.4;
  • compartments:
  • electrical field:
The cubicles must be stored in a dry area freefrom dust and with limited temperature variations.
  • for stocking: from -40°C to +70°C,
  • for working: from -5°C to +40°C,
  • other temperatures, consult us.
Main characteristics
Rated voltage (kV)7.21217.524 
Insulation level     
50 Hz, 1 mn
(kV rms)
(kV peak)
Breaking capacity 
Transformer off load (A)16 
Cables off load (A)31.5 
Short-time withstand current
(kA.1 s)
25630 - 1250 A 
20630 - 1250 A 
16630 - 1250 A 
12.5400 - 630 - 1250 A 
The making capacity is equal to 2.5 times the short-time withstand current.
* 60 kV peak for the CRM unit.

Maximum breaking capacity 
Rated voltage (kV)7.21217.524 
NSM-cables, NSM-busbars
630 A - 800 A* 
PM, QM, QMC, QMB25 kA 20 kA  
CRM10 kA8 kA   
CRM with fuses25 kA    
SF6 circuit breaker range: 
DM1-A, DM1-D, DM1-W, DM1-Z, DM1-S, DM225 kA20 kA 
Vacuum circuit breaker range: 
DMV-A, DMV-D, DMV-S25 kA20 kA 

Air Insulation Electrical Switchgear Ring Main Unit

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