Product Type: EP12/1250-31.5B

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	48kV,r.m.s
4.Rated Impulse Withstand Voltage:Air	95kV,Peak
5.Rated Normal Current	1250A
6.Rated Short-Circuit Current(3Phase Symmetrical Basis)	31.5kA,r.m.s
7.Percentage D.C. Component of Rated S.C. Breaking Current	50%
8.Rated Short-Circuit Making Current	80kA,Peak
9.Rated Duration of Short Time Current	3s
10.Rated Short Time Withstand Current	31.5kA,r.m.s
11.Rated Peak Withstand Current	80kA,r.m.s
12.Maximum Contact Resistance at Minimum Closing Force	20Micro ohms
13.Capacitor Switching Capacity(Single Bank)	400A,r.m.s
MECHANICAL DATA
1.Contact Force from Atmospheric Pressure	19.8kgF
MECHANICAL REQUIREMENTS(REF. VCB)
1.Contact Stroke	9±1 mm
2.Opening Speed(average of 75 contact gap)	0.9-1.3m/Sec
3.Maximum Overtravel During Opening	2mm
4.Maximun Rebound During Opening	2mm
5.Closing Speed(average of last 30% contact gap)	0.4-0.8m/Sec
6.Maximum Contact Bounse Duration(with maximum 2 bounces)	0.002Sec
7.Rated Contact Compressive Force	290-330kgF
LIFE (ESTIMATED)
1.Electrical Life at Rated Normal Current	30,000Operations
2.Electrical Life at Rated Short Circuit Current	50Operations
3.Mechanical Life	30,000Operations
4.Contact Erosion Limit	3mm
5.Shelf Life	30Years