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GVAP416 Datasheet(PDF) 44 Page - Schneider Electric |
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GVAP416 Datasheet(HTML) 44 Page - Schneider Electric |
44 / 64 page ![]() Manual Motor Starters, Controllers, and Protectors Specifications © 2001-2002 Schneider Electric All Rights Reserved 44 10/02 GV7 OPERATING CURVES The current limiting capacity of the motor starter and protector is expressed by two curves which give, as a function of the prospective short-circuit current (the current which would flow if no protection devices were installed): • The actual peak current (limited), • The thermal stress (in A2s), i.e. the energy dissipated by the short-circuit in a conductor with a resistance of 1 Ω. Example: The real value of a 70 kA prospective short-circuit current limited by a GV7RS220 is 20kA peak, see page 46. PRC = Cross-linked polyethylene Example 1: For a GV7RS220, the peak value is limited to 20 kA for a prospective Isc of 40 kA. Example 2: For a GV7RS220, and with a prospective Isc of 40 kA, an I2t of 7.5 x 105 A2s is obtained, which requires the use of a PVC insulated copper cable with a cross-sectional area of 10 mm2 (# 8 AWG). Permissible Thermal Stresses for Cables (A2s) S (mm2) 1.5 2.5 4 6 1016253550 AWG #16 #14 #12 #10 #8 #6 #4 #2 #1 PVC Insulation Cu 2.97 x 104 8.26 x 104 2.12 x 105 4.76 x 105 1.32 x 106 3.4 x 106 8.26 x 106 1.62 x 107 3.31 x 107 Al – – 5.41 x 105 1.39 x 106 3.38 x 106 6.64 x 106 1.35 x 107 –– PRC Cu 4.10 x 104 1.39 x 105 2.92 x 105 6.56 x 105 1.82 x 106 4.69 x 106 1.39 x 107 2.23 x 107 4.56 x 107 Al – – 7.52 x 105 1.93 x 106 4.70 x 106 9.23 x 106 1.88 x 107 –– |
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