Product Type: VITD 12/1250-25M

ELECTRICAL RATINGS(3PHASE) SYMMETRICAL BASIS
1.Rated Frequency	50/60Hz
2.Rated Maximum Line to Line Voltage	12kV,r.m.s
3.Rated Power Frequency Withstand Voltage:Air	38kV,r.m.s
4.Rated Impulse Withstand Voltage:Air	95kV,Peak
5.Rated Normal Current	1250A
6.Rated Short-Circuit Current(3Phase Symmetrical Basis)	25kA,r.m.s
7.Percentage D.C. Component of Rated S.C. Breaking Current	50%
8.Rated Short-Circuit Making Current	63kA,Peak
9.Rated Duration of Short Time Current	3s
10.Rated Short Time Withstand Current	25kA,r.m.s
11.Rated Peak Withstand Current	63kA,r.m.s
12.Maximum Contact Resistance at Minimum Closing Force	25Micro ohms
13.Capacitor Switching Capacity(Single Bank)	400A,r.m.s
MECHANICAL DATA
1.Interrupter Weight(Approx.)	2.65kg
2.Moving Part Weight(Approx.)	1.2kg
3.Contact Force from Atmospheric Pressure	15.9kgF
MECHANICAL REQUIREMENTS(REF. VCB)
1.Contact Stroke	8±1 mm
2.Opening Speed(average of 75 contact gap)	1.0-1.4m/Sec
3.Maximum Overtravel During Opening	2mm
4.Maximun Rebound During Opening	2mm
5.Closing Speed(average of last 30% contact gap)	0.6-1.0m/Sec
6.Maximum Contact Bounse Duration(with maximum 2 bounces)	0.002Sec
7.Rated Contact Compressive Force	184-224kgF
LIFE (ESTIMATED)
1.Electrical Life at Rated Normal Current	50,000Operations
2.Electrical Life at Rated Short Circuit Current	100Operations
3.Mechanical Life	50,000Operations
4.Contact Erosion Limit	3mm
5.Shelf Life	20Years