| Muhimmiya | ROCKWILL | 
| Model NO. | 12/24kV Solid Insulated Metal-enclosed ring main unit 12/24kV Soli Insulated Metal-enclosed Ring Main Unit | 
| Rated Voltage | 12kV | 
| Rated Frequency | 50/60Hz | 
| Siri | CKSS | 
Siri CKSS-12/24 nke ring main unit bụ insulated metal common tank enclosed switchgear, eji load break switch unit, load break switch fuse combination electrical unit, vacuum circuit breaker unit, na incoming line unit of bus. O na-enye otu oke ọdịnala na materials, na electrical and mechanical properties dị mfe, enweghị ike inwe obi maka environment and climate, n'ụzọ dị elu, ọ dị nwute ikpe, ọ dị nwute eme, enweghị ike inwe mmadụ site, ma o ga-enwe ike inwe combine flexibly. Nkọwa ya na-enye nkọwa dị mfe na akpọmkpọ, ka ọ dị nwute eme, feeder's connection capacity dị mfe, dị ka ọ ga-enwere ike inwe wiring systems dị iche iche.
Otu
| 
 Unit code  | 
 Meaning  | 
| 
 C  | 
 Standard single casing load break switch unit  | 
| 
 F  | 
 Load break switch and fuse combination  | 
| 
 V  | 
 Apparatus unit  | 
| 
 D  | 
 Cable unit(without switch)  | 
| 
 +  | 
 Side casing of busbar  | 
| 
 -  | 
 Top casing of busbar  | 
| 
 SL  | 
 Bus couple unit  | 
| 
 M  | 
 Metering unit  | 
| 
 PT  | 
 PT unit  | 
| 
 1K2(4)  | 
 Double-sleeve outgoing load break switch unit  | 
Technical Sheet
| 
 ltem  | 
 Unit  | 
 Load break switch unit  | 
 Combination apparatus  | 
 Fuse unit  | 
|
| 
 Rated voltage  | 
 kV  | 
 12/24  | 
 12/24  | 
 12/24  | 
|
| 
 Rated frequency  | 
 Hz  | 
 50  | 
 50  | 
 50  | 
|
| 
 Rated current  | 
 A  | 
 630  | 
 Depend on rated current of fuse  | 
 630  | 
|
| 
 P.F.withstand voltage (phase to phase.phase to earth)  | 
 kV  | 
 42/65  | 
 42/65  | 
 42/65  | 
|
| 
 Ated insulation levels  | 
 P.F.withstand voltage(Across open contacts)  | 
 48/79  | 
 48/79  | 
 48/79  | 
|
| 
 P.F.withstand voltage (Control and auxiliary circuit)  | 
 2/2  | 
 2/2  | 
 2/2  | 
||
| 
 Lightning impulse withstand voltage (phase to phase, phase to earth)  | 
 75/125  | 
 75/125  | 
 75/125  | 
||
| 
 Across open contacts  | 
 85/145  | 
 85/145  | 
 85/145  | 
||
| 
 Ogauge pressure test  | 
 —  | 
 Pass  | 
 Pass  | 
 Pass  | 
|
| 
 Rated short time withstand current  | 
 kA  | 
 20/4s/20/3s  | 
 —  | 
 20/4s/20/4s  | 
|
| 
 Rated peak withstand current  | 
 kA  | 
 63  | 
 ——  | 
 63  | 
|
| 
 Rated short circuit making current  | 
 kA  | 
 50 or 63  | 
 Subject to high-voltage fuse  | 
 50  | 
|
| 
 Rated short circuit breaking current  | 
 kA  | 
 —  | 
 Subject to high-voltage fuse  | 
 20/20  | 
|
| 
 Rated transform current  | 
 A  | 
 —  | 
 1750/1400  | 
 —  | 
|
| 
 Rated active load breaking current  | 
 A  | 
 630  | 
 —  | 
 —  | 
|
| 
 Rated Closed loop breaking current  | 
 A  | 
 630  | 
 —  | 
 630  | 
|
| 
 Mechanical life  | 
 Load break switch/breaker  | 
 Time  | 
 5000  | 
 5000  | 
 10000  | 
| 
 Isolating switch/earthing switch  | 
 5000  | 
 5000  | 
 5000  | 
||
| 
 Loop resistance  | 
 μΩ  | 
 ≤120  | 
 —  | 
 ≤120  | 
|
| 
 Inflation pressure  | 
 Rated inflation pressure(absolute pressure)  | 
 bar  | 
 1.3  | 
 1.3  | 
 1.3  | 
| 
 Minimum inflation pressure(absolute pressure)  | 
 1.2  | 
 1.2  | 
 1.2  | 
||
| 
 Relative rate leakage of gas  | 
 %  | 
 ≤0.02  | 
 ≤0.02  | 
 ≤0.02  | 
|
Remark: l :Neutral point earthing system through low resistance
