DR-6 - Ring Main Unit

Technical specifications

Rated voltage	kV	12	17,5	24
General specifications
Impulse withstand voltage 1,2/50 µsec
To earth and between phases	kV	75	95	125
Over the insulation distance	kV	85	110	45
Power frequency voltage test 1 min.
To earth and between phases	kV	28	38	50
Over the insulation distance	kV	32	45	60
Rated frequency	Hz	50/60
Rated current	A	630		400/630
Rated short time current 1 sec	kA	25	20	12,5/16/20
Rated peak value of the current	kA	63	50	40/50
Breaking capacity (IEC 60265.1)		ClassE3
Rated current	A	630	630	400/630
Closed loop	A	630	630	400/630
No load cable	A	30	30	30
Earth leakage fault	A	100	100	100
Line feeder
Rated current	A	630	630	630
Rated short time current 1 sec	kA	25	20	12,5/16/20
Rated peak value of the current	kA	63	50	1,5/40/50
Transformer feederl
Rated current	A	200	200	200
Fuse switch
Short circuit breaking capacity (limited by the fuse)	kA	25	25	16/20
making capacity	kA	63	63	40/50
Circuit breaker
Short circuit breaking capacity 1 sec.	kA	25	20	20
Making capacity	kA	63	50	50
Internal arc 1 sec IEC 60298 - 6 criteria	kA	16	16	16
Degree of protection		IP7x
Rated gas pressure at 20 °C	Bar	0,3 bar overpressure