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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 Reserved10-EN
ENGLISH
Trip Unit Switches
Long-Time Protection
Long-time protection protects equipment against
overloads.
• Long-time protection is standard on all trip
units.
• The long-time pickup (Ir) (A) sets the
maximum current level (based on sensor
plug rating In) which the circuit breaker can
continuously carry. If current exceeds this
value, circuit breaker will trip after the preset
time delay. The long-time pickup (Ir) is
adjustable from 0.4–1.0 times the sensor
plug rating (In).
• The long-time delay (tr) (B) sets the length of
the time that the circuit breaker will carry an
overcurrent (below the short-time or
instantaneous pickup current level) before
tripping. See Table 1 for delay settings.
• Both long-time pickup and long-time delay
are on the field-replaceable adjustable rating
plug. To change settings to more precisely
match the application, various rating plugs
are available. For instructions on replacing
the rating plug, see Section
5 —Adjustable
Rating Plug Replacement.
• For Masterpact™ NT and NW circuit
breakers, the In value can be changed by
replacing the sensor plug below the trip unit.
For further information, see the instructions
packed with the sensor plug replacement kit.
• The overload indicator light (C) indicates that
the Ir long-time pickup threshold has been
exceeded.
• Long-time protection uses true RMS
measurement.
Thermal imaging provides continuous
temperature rise status of the wiring, both before
and after the device trips. This allows the circuit
breaker to respond to a series of overload
conditions which could cause conductor
overheating, but would go undetected if the
long-time circuit was cleared every time the load
dropped below the pickup setting or after every
tripping event.
NOTE: Micrologic trip units are powered from the circuit to always provide
fault protection. All other functions (display, metering, communications, etc.)
require external power. See 15 for more information.
Figure 7: Long-Time Protection Switches
Table 1: Micrologic Trip Unit Long-Time Delay Values
Setting
1
Long-Time Delay in Seconds
2
tr at 1.5 x Ir 12.5 25 50 100 200 300 400 500 600
tr at 6 x Ir 0.51 2 4 8 12162024
tr at 7.2 x Ir 0.34
3
0.69 1.38 2.7 5.5 8.3 11 13.8 16.6
1
Ir = In x long-time pickup. In = sensor rating. Trip threshold between 1.05 and 1.20 Ir.
2
Time-delay accuracy +0/-20%
3
For Micrologic 5.0A and 6.0A trip units, when tsd is set to 0.4 on or 4.0 off, then tr = 0.5 instead of 0.34.
NOTE: If checking trip times, wait a minimum of 15 minutes after circuit
breaker trips before resetting to allow the thermal imaging to reset
completely to zero or use a full-function test kit to defeat the thermal
imaging.
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 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
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
B
C
Micrologic 2.0A Trip Unit
Micrologic 3.0A Trip Unit
A
B
C
A
B
C
Micrologic 5.0A Trip Unit
Micrologic 6.0A Trip Unit
A
B
C