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Calculator
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Number of curves
1
2
3
4
Fault current (A)
Relay pickup current (in primary, A)
Time dial (TD) / Time multiplier (TM)
Select curve equation
IEC Standard
IEEE Standard C37
Electromechanical IAC
US
Curve type
IEC_STD_INVERSE_TIME
IEC_GE_CURVE_A
IEC_SEL_C1
IEC_VERY_INVERSE_TIME
IEC_GE_CURVE_B
IEC_SEL_C2
IEC_EXTREMELY_INVERSE_TIME
IEC_GE_CURVE_C
IEC_SEL_C3
IEC_LONG_TIME_INVERSE
IEC_SEL_C4
IEC_SHORT_INVERSE
IEC_SEL_C5
Tripping time at fault current (s):
Relay pickup current (in primary, A)
Time dial (TD) / Time multiplier (TM)
Select curve equation
IEC Standard
IEEE Standard C37
Electromechanical IAC
US
Curve type
IEC_STD_INVERSE_TIME
IEC_GE_CURVE_A
IEC_SEL_C1
IEC_VERY_INVERSE_TIME
IEC_GE_CURVE_B
IEC_SEL_C2
IEC_EXTREMELY_INVERSE_TIME
IEC_GE_CURVE_C
IEC_SEL_C3
IEC_LONG_TIME_INVERSE
IEC_SEL_C4
IEC_SHORT_INVERSE
IEC_SEL_C5
Tripping time at fault current (s):
Relay pickup current (in primary, A)
Time dial (TD) / Time multiplier (TM)
Select curve equation
IEC Standard
IEEE Standard C37
Electromechanical IAC
US
Curve type
IEC_STD_INVERSE_TIME
IEC_GE_CURVE_A
IEC_SEL_C1
IEC_VERY_INVERSE_TIME
IEC_GE_CURVE_B
IEC_SEL_C2
IEC_EXTREMELY_INVERSE_TIME
IEC_GE_CURVE_C
IEC_SEL_C3
IEC_LONG_TIME_INVERSE
IEC_SEL_C4
IEC_SHORT_INVERSE
IEC_SEL_C5
Tripping time at fault current (s):
Relay pickup current (in primary, A)
Time dial (TD) / Time multiplier (TM)
Select curve equation
IEC Standard
IEEE Standard C37
Electromechanical IAC
US
Curve type
IEC_STD_INVERSE_TIME
IEC_GE_CURVE_A
IEC_SEL_C1
IEC_VERY_INVERSE_TIME
IEC_GE_CURVE_B
IEC_SEL_C2
IEC_EXTREMELY_INVERSE_TIME
IEC_GE_CURVE_C
IEC_SEL_C3
IEC_LONG_TIME_INVERSE
IEC_SEL_C4
IEC_SHORT_INVERSE
IEC_SEL_C5
Tripping time at fault current (s):
Calculate
Desired tripping time (s)
1.2
Time dial (TD) / Time multiplier (TM):
Desired tripping time (s)
1.2
Time dial (TD) / Time multiplier (TM):
Desired tripping time (s)
1.2
Time dial (TD) / Time multiplier (TM):
Desired tripping time (s)
1.2
Time dial (TD) / Time multiplier (TM):
Calculate TM/TD