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4 Technical Data
4.3
Inverse-Time Overcurrent Protection (ANSI 51V)
Setting Ranges / Increments
Trip Time Curves acc. to IEC
Tolerances
308
Pickup current I
for I
p
(Phase)
for I
Time Multipliers T for
I
p
IEC curves
Time Multiplier D for I
p
ANSI curves
Undervoltage enableU<
As per IEC 60255-3, Section 3.5.2 or BS 142 (see also Figure 4-1)
≥ 20 are identical to those for I/I
The trip times for I/I
p
Pickup Threshold
Dropout Threshold
Pickup Currents I
p
Pickup Threshold U<
Time for 2 ≤ I/I
≤ 20
p
= 1 A
0.10 A to 4.00 A
N
= 5A
0.50 A to 20.00 A
N
0.05 s to 3.20 s
or ∞ (ineffective)
0.50 to 15.00
or ∞ (ineffective)
10.0 V to 125.0 V
= 20.
p
approx. 1.10 · I
Approx. 1.05 · I
for I
= 1 A
1 % of setting value or 10 mA
N
for I
= 5A
5 % of setting value or 50 mA
N
1 % of setting value, or 0.5 V
5 % of reference (calculated) value +1 % current
tolerance, or 40 ms
Increments 0.01 A
Increments 0.05 A
Increments 0.01 s
Increments 0.01
Increments 0.1V
p
≥ 0.3
for I
/I
p
p
N
7UM61 Manual
C53000-G1176-C127-3
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