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EP426A Embedded Poles

Basic Info

Model No.: EP24/1250-31.5A

Product Description


Product Type: EP24/1250-31.5A




ELECTRICAL RATINGS(3PHASE) SYMMETRICAL BASIS
1.Rated Frequency 50/60Hz
2.Rated Maximum Line to Line Voltage 24kV,r.m.s
3.Rated Power Frequency Withstand Voltage:Air 65/79kV,r.m.s
4.Rated Impulse Withstand Voltage:Air 125/145kV,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 131 mm
2.Opening Speed(average of 75 contact gap) 1.0-1.6m/Sec
3.Maximum Overtravel During Opening 2mm
4.Maximun Rebound During Opening 2mm
5.Closing Speed(average of last 30% contact gap) 0.7-1.1m/Sec
6.Maximum Contact Bounse Duration(with maximum 2 bounces) 0.002Sec
7.Rated Contact Compressive Force 320-370kgF
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

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