MicroLogic 2.0, 3.0, and 5.0 Basic Trip Units
The MicroLogic 2.0, 3.0, and 5.0 trip units protect power circuits.
Protection thresholds and delays are set using the rotary switches.
A full-range of long-time settings are available via the field-installable adjustable rating plugs.
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Overload protection
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True RMS long-time protection
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Thermal imaging: active thermal imaging before and after tripping
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Short-circuit protection
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Short-time RMS
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Selection of I2t type (ON or OFF) for short-time delay
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Instantaneous protection
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Neutral protection on four-pole circuit breakers
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1—Overload signal (LED) 2—Long-time rating plug screw 3—Long-time current setting and tripping delay 4—Instantaneous pickup 5—Short-time pickup and tripping delay 6—Test connector |
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MicroLogic 5.0 Basic Trip Unit |
MicroLogic 2.0 and 3.0 Basic Trip Unit Settings
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Long-Time Protection |
Current Setting (A) |
Ir = ln x... |
2.0: |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
0.95 |
0.98 |
1 |
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3.0: |
0.4 |
0.45 |
0.5 |
0.6 |
0.63 |
0.7 |
0.8 |
0.9 |
1 |
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Other ranges are available by changing rating plug |
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Time Delay (s) Accuracy: 0 to –20% |
tr at 1.5 x Ir |
12.5 |
25 |
50 |
100 |
200 |
300 |
400 |
500 |
600 |
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0.5 |
1 |
2 |
4 |
8 |
12 |
16 |
20 |
24 |
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0.34 |
0.69 |
1.38 |
2.7 |
5.5 |
8.3 |
11 |
13.8 |
16.6 |
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Thermal Imaging |
20 minutes before or after tripping |
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Short-Time Protection |
Current Setting (A) |
Isd = Ir x... |
2.0: |
1.5 |
2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
10 |
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Instantaneous Protection |
Current Setting (A) |
Ii = In x... |
3.0: |
1.5 |
2 |
3 |
4 |
5 |
6 |
8 |
10 |
12 |
MicroLogic 5.0 Basic Trip Unit Settings
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Long-Time Protection |
Current Setting (A) |
Ir = ln x... |
IEC: |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
0.95 |
0.98 |
1 |
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UL/ANSI: |
0.4 |
0.45 |
0.5 |
0.6 |
0.63 |
0.7 |
0.8 |
0.9 |
1 |
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Other ranges are available by changing rating plug |
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Time Delay (s) |
tr at 1.5 x Ir |
12.5 |
25 |
50 |
100 |
200 |
300 |
400 |
500 |
600 |
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tr at 6 x Ir |
0.5 |
1 |
2 |
4 |
8 |
12 |
16 |
20 |
24 |
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tr at 7.2 x Ir |
0.34 |
0.69 |
1.38 |
2.7 |
5.5 |
8.3 |
11 |
13.8 |
16.6 |
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Thermal Imaging |
20 minutes before or after tripping |
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Short-Time Protection |
Current Setting (A) |
lsd = Ir x... |
1.5 |
2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
10 |
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Time Delay (s) |
Settings |
I2t OFF |
0 |
0.1 |
0.2 |
0.3 |
0.4 |
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I2t ON |
0.1 |
0.2 |
0.3 |
0.4 |
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tsd |
Min. trip time (ms) |
20 |
80 |
140 |
230 |
350 |
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Max. trip time (ms) |
80 |
140 |
200 |
320 |
500 |
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Instantaneous Protection |
Current Setting (A) |
Ii = In x... |
2 |
3 |
4 |
6 |
8 |
10 |
12 |
15 |
off |
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