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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 Reserved12-EN
ENGLISH
Instantaneous Protection
Instantaneous protection protects equipment
against short circuits with no intentional time
delay.
• Instantaneous protection (Ii) (A) is standard
on the 3.0A, 5.0A and 6.0A trip units.
• Instantaneous protection on 2.0A trip units is
achieved by using short-time protection (Isd)
with the short-time delay factory set to 0
(zero).
• Instantaneous protection on the 3.0A, 5.0A
and 6.0A trip units is based on the circuit
breaker sensor rating (In).
• Instantaneous protection on the 2.0A trip unit
is based on the long-time pickup setting (Ir).
• Circuit breaker open command is issued as
soon as threshold current is exceeded.
• Instantaneous protection uses peak current
measurement.
• When instantaneous protection switch is set
to off, the instantaneous protection is
disabled.
Figure 9: Instantaneous Protection Switches
Table 3: Micrologic Instantaneous Values
Setting Interruption Current
2.0A Isd (= Ir x..) 1.522.53456810
3.0A
Ii (= In x..) 1.52345681012
5.0A
Ii (= In x..) 23468101215off
6.0A
Ii (= In x..) 23468101215off
Ii = UL and ANSI instantaneous
Isd = IEC instantaneous (short-time with zero delay)
In = sensor rating
Ir = long-time pickup
Micrologic 6.0A Trip Unit
Micrologic 5.0A Trip Unit
x Ir
2
2.5
3
4
5
6
8
10
1.
5
setting
Isd
instantaneous
long time
alarm
tr
(s)
.4
.5
.6
.7
.8
.9
.95
.98
1
Ir
x In
.5
1
2
4
8
12
16
20
@ 6 Ir
24
06134243
x In
2
3
4
5
6
8
10
12
1.
5
setting
Ii
instantaneous
long time
alarm
tr
(s)
.4
.5
.6
.7
.8
.9
.95
.98
1
Ir
x In
.5
1
2
4
8
12
16
20
@ 6 Ir
24
06133203
.4
.5
.6
.7
.8
.9
.95
.98
1
delay
short tim
e
I itsd
(s)
on I
2
t
.2
.3
.4
.4
.1
.2
.3
.1
0
off
instantaneous
long time
alarm
Ir
x In
.5
1
2
4
8
12
16
20
tr
(s)
@
6 Ir
24
setting
x Ir
2
2.5
3
4
5
6
8
10
Isd
1.
5
x In
3
4
6
8
10
12
15
off
2
06133204
.4
.5
.6
.7
.8
.9
.95
.98
1
delay
short time
I itsd
(s)
on
I
2
t
.
2
.
3
.
4
.
4
.
1
.
2
.
3
.
1
0
off
instantaneous
long time
alarm
Ir
x In
ground fault
B
C
D
E
F
G
H
J
Ig tg
(s)
on
I
2
t
.
2
.
3
.
4
.
4
.
1
.
2
.
3
.
1
0
off
A
.5
1
2
4
8
12
16
20
tr
(s)
@
6 Ir
24
setting
x Ir
2
2.5
3
4
5
6
8
10
Isd
1.
5
x In
3
4
5
8
10
12
15
off
2
test
06133351
A
A
A
A
Micrologic 2.0A Trip Unit
Micrologic 3.0A Trip Unit