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Electrical Ratings (3Phase) Symmetrical Basis
Rated frequency	50/60Hz
Rated Voltage	36/40.5kV,r.m.s
Rated short-time power-frequency withstand voltage (1 min)	70/95kV,r.m.s
Rated lightning impulse withstand voltage	170/185kV,Peak
Rated Current	1250A
Circuit resistance at lowest rated contact force	â‰Â¤20Micro ohms
Rated short-circuit breaking Current	20kA,r.m.s
Rated short-time withstand current	20kA,r.m.s
Rated duration of short-circuit	4s
Rated peak withstand current	50kA,r.m.s
Rated short-circuit making Current	50kA,r.m.s
Max. Dc component	40.00%
*Rated breaking current of single capacitor bank	630A,r.m.s
*Rated breaking current of back-to-back capacitor bank	400A,r.m.s
Rated operating sequence	O-0.3(0.5)s-CO- 180s-CO
Mechanical Data
Interrupter Weight(Approx.)	4.08kg
Weight of movable parts	2.1kg
Closing force due to bellow and atmosphere	170±40N
Force required to hold contacts open at full stroke	320±50N
Mechanical Requirements (Ref. Vcb)
Clearance between open contacts	16±1mm
Average opening speed(average of first 75% of contact gap)	1.5±0.3m/Sec
Average closing speed(average of last 30% of contact gap)	1.1±0.2m/Sec
Rated added external contact final force	2000±200N
Contact bouncing duration at closing operation	â‰Â¤2ms
Closing and Opening non-simultaneity of three-phase Contacts	â‰Â¤2ms
Maximum Rebound during opening	â‰Â¤2mm
Life
Electrical Life at Rated Normal Current	20,000 Operations
Electrical Life at Rated Short Circuit Current	50 Operations
Mechanical Life	30,000 Operations
Contact Erosion Limit	3mm
Shelf Life	20Years

Note

• Meets or exceeds the electrical endurance requirements of class E2 for autoreclosing duty per IEC 62271-200 and JB 8738- 2008.
• * Rated Characteristics to be given on request.