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Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units 48049-136-05
Section 1—General Information Rev. 01, 07/2012
© 1999–2012 Schneider Electric All Rights Reserved14-EN
ENGLISH
Trip Unit Testing Trip unit functions can be tested using primary injection testing or secondary
injection testing.
Micrologic Trip Unit Configuration
Control Power The A trip unit was designed to be used with or without an external 24 Vdc
power supply.
The following will be powered and functional even if the trip unit is not
externally powered:
• Fault protection for LSIG functions. The A trip unit is fully circuit powered
for fault protection.
• LED trip indication (powered by an onboard battery). The battery’s only
function is to provide LED indication if all other power is off
• All display functions and trip unit features power-up with current flow on
one phase greater than or equal to the values in Table 6.
• Ground-fault push-to-trip button works for testing ground fault with
current flow on one phase greater than or equal to the values in Table 6.
The ground-fault push-to-trip is also functional if a Hand-Held Test Kit or
Full-Function Test Kit is powering the trip unit.
Trip Indicator Lights
The Ir trip indicator light (A) lights when a trip
occurs because the Ir long-time pickup level was
exceeded.
The Isd/Ii trip indicator light (B) lights when a trip
occurs because the Isd short-time pickup or the
Ii instantaneous pickup was exceeded.
The Ig trip indicator light (C) lights when a trip
occurs because the Ig ground fault pickup was
exceeded.
The Ap self-protection indicator light (D) lights
when the trip unit overheats, the instantaneous
override level is exceeded, or a trip unit power
supply failure occurs.
Figure 12: Trip Indicator Lights
Ammeter
The ammeter monitors and displays the circuit
breaker currents. An alphanumeric screen (A)
continuously displays the phase at the highest
load. Navigation buttons (B) can be pressed to
display the various monitored currents.
The process of checking the ammeter values
can be stopped at any time. After several
seconds, Micrologic trip units automatically
return to displaying the phase at the highest
load.
See the following section for addition information
concerning the ammeter.
Figure 13: Ammeter
Micrologic 6.0 A
06133245
A
B
C
D
menu
40
100
%
%
A
B
Table 6: Pickup Values
Sensor Plug Value
(In)
Minimum Ground-Fault
Pickup
100–250 A 30% of Sensor Rating
400–1200 A 20% of Sensor Rating
1600–6300 A 500 A