3-10
Overcurrent Protection
Date Code 20010518
SEL-501-2 (MB2/MB4) Instruction Manual
T
IME
-O
VERCURRENT
E
LEMENT
O
PERATE
/R
ESET
C
URVE
E
QUATIONS
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US Moderately Inverse Curve: U1
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US Inverse Curve: U2
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US Very Inverse Curve: U3
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US Extremely Inverse Curve: U4
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IEC Class A Curve: C1 (Standard Inverse)
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IEC Class B Curve: C2 (Very Inverse)
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IEC Class C Curve: C3 (Extremely Inverse)
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IEC Long Time Inverse: C4
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