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559E1200.indd
version: 1.0
Functions and
characteristics
Protection of distribution systems
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Micrologic 2 trip units can be used on
Compact NSX100 to 630 circuit breakers
with performance levels B/F/H/N/S/L.
They provide:
b
standard protection of distribution cables
b
indication of:
v
overloads (via LEDs)
v
overload tripping (via the SDx relay
module).
Circuit breakers equipped with Micrologic
1.3-M trip units, without thermal protection,
are used in certain applications to replace
switch-disconnectors at the head of
switchboards. Micrologic 1.3-M trip units are
dedicated to Compact NSX400/630 A circuit
breakers.
Micrologic 2
Circuit breakers equipped with Micrologic 2 trip units can be used to protect
distribution systems supplied by transformers. For generators and long cables,
Micrologic 2-G trip units offer better suited low pick-up solutions
(see page A-50)
.
Protection
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Overloads: Long time protection (Ir)
Inverse time protection against overloads with an ad
j
ustable current pick-up Ir set
using a dial and a non-ad
j
ustable time delay tr.
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delay used to allow discrimination with the downstream device.
Short-circuits: Non-adjustable instantaneous protection
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Neutral protection
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b
On four-pole circuit breakers, neutral protection may be set using a three-position
b
switch:
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Indications
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Front indications
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b
event of a fault.
Orange overload pre-alarm LED: steady on when I > 90 % Ir
b
Red overload LED: steady on when I > 105 % Ir
b
Remote indications
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circuit breaker.
This module receives the signal from the Micrologic electronic trip unit via an optical
link and makes it available on the terminal block. The signal is cleared when the
circuit breaker is reclosed. For description,
see page A-81
.
Micrologic 1.3-M for magnetic protection only
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applications to replace switch-disconnectors at the head of switchboards. They are
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see page A-40
.
50
A
Note:
all the trip units have a transparent lead-sealable cover
that protects access to the adjustment dials.
3%
SDx remote indication relay
module with its terminal block.
DB112050
DB112051
DB112019
DB112106
A-16