MicroLogic 2.0A, 3.0A, 5.0A, & 6.0A Trip Units with Ammeter
MicroLogic A trip units protect power circuits and provide current measurements, overload protection, and short-circuit protection. In addition, the 6.0A trip units also provide ground-fault protection for equipment.
Ammeter Trip Unit Protection Settings
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1—Test lamp and reset 2—Indication of tripping cause 3—Digital display 4—Three-phase bar graph and ammeter 5—Navigation buttons 6—Overload signal (LED) 7—Long-time rating plug screw 8—Long-time current setting and tripping delay 9—Short-time pickup and tripping delay 10—Instantaneous pickup 11—Electronic push-to-trip 12—Ground-fault pickup and tripping delay 13—Test connector |
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MicroLogic 6.0A Trip Unit |
Protection thresholds and delays are set using the rotary switches. The selected values are momentarily displayed in amperes and in seconds. A full-range of long-time settings are available via the field-installable rating plug.
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Overload protection (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
— Short-time RMS
— I2t ON or OFF for short-time delay -
Instantaneous protection
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Ground-fault protection for equipment
— Residual ground-fault protection for equipment
— Source ground-return ground-fault protection for equipment
— Modified differential ground-fault protection (MDGF) for equipment -
Neutral protection on four-pole circuit breakers
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ZSI: Zone-selective interlocking
— ZSI terminal block may be used to interconnect a number of trip units to provide total discrimination for short-time and equipment ground-fault protection, without delay for tripping
— Not available for 3.0 A trip unit
— Not available for 2.0 A trip unit if installed as upstream device
Ammeter Measurements
MicroLogic A trip units measure the true RMS value of currents. They provide continuous current measurement from 0.2 to 20 x In with an accuracy of 1.5% (including sensors). No auxiliary source is needed where I > 0.2 x In. The optional external power supply (24 Vdc) makes it possible to display currents where I < 0.2 x In and to store values of the interrupted current. A digital LCD screen continuously displays the most heavily loaded phase (Imax) or displays the Ia, Ib, Ic, Ig, and (on four-pole circuit breakers only) In stored current and setting values by successively pressing the navigation button.
Communication Network
Four wire Modbus, RTU, RS485 or two wire Modbus, TRU, RS485 plus ULP. See COM Option in MasterPacT Circuit Breakers.
In conjunction with an optional communication network, the trip unit transmits the following parameters:
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Setting values.
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All ammeter measurements.
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Tripping causes.
MicroLogic 2.0A and 3.0A Trip Unit Settings
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Long-Time Protection |
Current Setting (A) |
Ir = ln x... |
2.0A: |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
0.95 |
0.98 |
1 |
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3.0A: |
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) |
Isd = Ir x... |
2.0A: |
1.5 |
2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
10 |
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Instantaneous Protection |
Current Setting (A) |
Ii = In x... |
3.0A: |
1.5 |
2 |
3 |
4 |
5 |
6 |
8 |
10 |
12 |
MicroLogic 5.0A and 6.0A 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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MicroLogic 6.0A Trip Unit Ground-Fault Settings
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Ground-Fault Pickup (A) Accuracy: ±10% |
Ig = ln x... |
A |
B |
C |
D |
E |
F |
G |
H |
J |
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ln ≤ 400 A |
0.3 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1 |
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400 A < ln ≤1200 A |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1 |
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ln > 1200 A |
500 |
640 |
720 |
800 |
880 |
960 |
1040 |
1120 |
1200 |
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Time Delay (s) at 1 x In |
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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tg |
Minimum Trip Time (ms) |
20 |
80 |
140 |
230 |
350 |
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Maximum Trip Time (ms) |
80 |
140 |
200 |
320 |
500 |
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