The Micrologic X control unit’s basic protection functions are on a dedicated circuit and processor that is protected from disturbances.
In-depth diagnostics allows users to follow the status and operating condition of the circuit breaker in real time.
The backlit display will change colors for various states, providing a clear indication when attention is needed.
Information processed by the Micrologic X control unit can be displayed on the embedded HMI, a smart device through Bluetooth technology or NFC, local front display (FDM128), communications such as Ethernet, and a PC through the USB connection.
Micrologic configuration is easily made through the Ecoreach tool.
Micrologic X Control Unit Protection Functions
The Micrologic X control unit is suitable for different systems of voltage, three or four wires up to 600 Vac, 50/60 Hz and for grounded systems.
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Micrologic 3.0 X |
LI: |
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Micrologic 5.0 X |
LSI: |
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Micrologic 6.0 X |
LSIG: |
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Long-Time Overload Protection (ANSI 49RMS/51)
Long-time protection protects the conductors against overload currents. It is based on the true RMS current and is implemented independently for each phase and the neutral.
Thermal imaging is integrated into the long-time protection that models the heating and cooling cycles of the conductors.
Short-Time Short Circuit Protection (ANSI 50TD/51)
Short-time protection protects the installation against phase-to-phase, phase-to-neutral and phase-to-ground short circuits.
It is based on the true RMS current. It includes two characteristics depending on the status of the I2t setting:
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When I2t is OFF, a definite time characteristic is selected.
The protection trips with the time delay tsd as soon as the setting current Isd is exceeded. -
When I2t is ON, an inverse time characteristic is selected.
The protection operates with the inverse time characteristic up to 10 x Ir and with a definite time characteristic above 10 x Ir.
Short-time adjustment may be used to improve selective coordination for the electrical system. Zone-selective interlocking (ZSI) interconnects multiple trip units to provide total coordination for short-time protection.
Instantaneous Short Circuit Protection (ANSI 50)
Instantaneous protection protects the installation against phase-to-phase, phase- to-neutral and phase-to-ground short circuits.
The protection operates with a definite time characteristic.
It trips without additional time delay when the setting current Ii is exceeded. The protection offers two selectable tripping times:
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Standard tripping time: 50 ms for applications requiring selectivity. Selectivity requires correctly sizing another circuit breaker installed downstream of the Masterpact circuit breaker.
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Fast tripping time: 30 ms (used when selectivity is not required).
Ground-Fault Protection (ANSI 50N-TD/51N)
Ground-fault protection can be achieved in two ways:
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By performing the summation of the three phases and neutral currents.
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By means of an external sensor (Source Ground Protection [SGR]*) installed around the cable connecting the transformer neutral point to ground. The SGR sensor is connected to the Micrologic 6.0 X control unit through an MDGF interface module.
Protective Function Ratings
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Protection Functions |
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Micrologic 3.0 X Control Unit |
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Long-Time |
ANSI Code 49RMS/51 |
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Current setting (A) |
Ir = In x … |
Ir = 0.4 In to In, 1 A increments |
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Tripping between 1.05 and 1.2 x Ir |
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Time setting |
tr = 0.5 s to 24 s, step 0.5 s for 6 x Ir |
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Time setting example: Time delay (s) |
1.5 x Ir (+0/-30%) |
12.5 |
25 |
50 |
100 |
200 |
300 |
400 |
500 |
600 |
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6 x Ir (+0/-30%) |
0.5* |
1 |
2 |
4 |
8 |
12 |
16 |
20 |
24 |
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7.2 x Ir (+0/-20%) |
0.7* |
0.69 |
1.38 |
2.7 |
5.5 |
8.3 |
11 |
13.8 |
16.6 |
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Thermal memory |
After tripping based on thermal imaging model |
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Instantaneous |
ANSI Code 50 |
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Pick-up (A) (±10%) |
Ii= In x … |
Ii = 1.5 In to 12 In, 0.5 In increments* |
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Operating time |
Max. resettable time: |
20 ms |
0 ms |
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Max breaking time: |
50 ms |
30 ms |
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Micrologic 5.0 X / 6.0 X Control Unit |
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Long-Time |
ANSI Code 49RMS/51 |
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Current setting (A) |
Ir = In x … |
Ir = 0.4 In to In, step 1 A |
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Tripping between 1.05 and 1.20 Ir |
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Time setting |
tr = 0.5 s to 24 s, 0.5 s increments for 6 Ir |
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Time setting example: Time delay (s) |
1.5 x Ir (+0/-30%) |
12.5 |
25 |
50 |
100 |
200 |
300 |
400 |
500 |
600 |
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6 x Ir (+0/-30%) |
0.5* |
1 |
2 |
4 |
8 |
12 |
16 |
20 |
24 |
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7.2 x Ir (+0/-20%) |
0.7* |
0.69 |
1.38 |
2.7 |
5.5 |
8.3 |
11 |
13.8 |
16.6 |
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Thermal memory |
After tripping based on thermal imaging model |
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Short-Time |
ANSI Code 50TD/51 |
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Pick-up (A) (±10%) |
Isd = Ir x … |
Isd = 1.5 Ir to 10 Ir, 0.5 Ir increments* |
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Time setting tsd (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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Operating time at 10 x Ir I2t Off or I2t On |
Max resettable time |
20 |
80 |
140 |
230 |
350 |
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Max break time |
80 |
140 |
200 |
320 |
500 |
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Instantaneous |
ANSI Code 50 |
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Pick-up (A) (±10%) |
Ii = In x … |
Ii = 2 to 15 In, 0.5 In increments, OFF protection* |
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Operating time |
Max resettable time: |
20 ms |
0 ms |
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Max breaking time |
50 ms |
30 ms |
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Micrologic 6.0 X Control Unit |
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Ground Fault |
Ground Fault ANSI Code 50N-TD/51N |
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Pick-up (A) (±10%) |
Ig = In x … |
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Time setting tg (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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Operating time (ms) |
Non-tripping time |
20 |
80 |
140 |
230 |
350 |
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Max breaking time |
80 |
140 |
200 |
320 |
500 |
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