1. No category

0613DB0301
R12/12, 12/2012
Data Bulletin
Replaces 0613DB0301 R11/11
How to Determine Circuit Breaker Ampere Rating
Circuit Breakers Equipped with Micrologic™ Trip System
Class 0600
Micrologic™ Trip Units
Types 3.2 (S), 3.3(S), 5.2, 5.3, 6.2,
and 6.3—Used With PowerPact™
H-, J- and L-Frame Circuit Breakers
Ampere rating (Ir) is set by the Ir dial (Figure1, A) on the face of the trip unit.
The maximum Ir setting corresponds to the sensor rating In (B).
Ampere rating Ir can be adjusted in 1 ampere increments on 5.2, 5.3, 6.2 and
6.3 trip units using the keypad (C).
Figure 1:
Micrologic 3.2(S), 3.3(S), 5.2, 5.3, 6.2 and 6.3 Trip Units
Micrologic 3 Electronic Trip Unit
In=60A
B
06113984
A
3.2
30 35 40
25
45
20
50
In Rating
15
60
Ir (A)
4
8 16
2
1
.5
A
15A
30
25
20
15
3
4
2
1.5
16
tr @ 6 Ir
Micrologic 5 Electronic Trip Unit
Trip Unit
16
4 6
8
3
2
tr
10
12
1.5
15
Ii (x In)
In=60A
Ir
Ii
B
35 40
45
50
60
6
8
10
12
15
Ii (x In)
A. Ampere rating Ir dial
B. Sensor rating In
Per the National Electrical Code 240.6(C) a circuit breaker that has restricted
access to the adjusting means shall be permitted to have an ampere rating
that is equal to the adjusted long-time pickup setting. Restricted access is
defined as: (1) removable and sealable covers over the adjustment means,
(2) bolted equipment enclosure doors, (3) locked doors accessible only to
qualified personnel. Sealable covers are provided using an optional wire
seal (catalog no. MICROTUSEAL).
Wire seal
Ground-Fault Setting
The Micrologic 6 trip unit incorporates ground-fault protection; both pickup
and time delay can be adjusted.
Set the ground-fault protection pickup Ig using the keypad. Set Ig to the exact
value required (in steps of 0.05 In from 0.2 x In to 1.0 x In for 100–600 A and
0.3 x In to 1.0 x In for 60 A).
Set the time delay tg using the keypad. Use the same setting for selecting
option I2t ON. Set tg to the desired value (0.0 s, 0.1 s, 0.2 s, 0.3 s, or 0.4 s with or without I2t ON).
© 2003–2012 Schneider Electric All Rights Reserved
™
How to Determine Circuit Breaker Ampere Rating
0613DB0301
R12/12, 12/2012
Micrologic™ Trip Units Types 3.0,
3.0A, 5.0, 5.0A, 5.0P, 5.0H, 6.0A,
6.0P, 6.0H—Used With
Masterpact™ NT and NW and
PowerPact™ M-, P-, and R-Frame
Circuit Breakers
Adjustable Rating Plug
Typically the A rating plug is supplied as standard equipment with factoryinstalled trip units. See Table 1 for other available rating plugs and settings.
06133208
Table 1:
Wire seal
In Rating
Adjustable Rating Plug Selection
Rating
Plug
Long-time Pickup Settings
A
1.0
0.90
0.80
0.70
0.63
0.60
0.50
0.45
0.40
B
1.0
0.95
0.88
0.75
0.63
0.56
0.50
0.44
0.40
C
1.0
0.95
0.83
0.75
0.67
0.58
0.53
0.50
0.42
D
1.0
0.95
0.93
0.90
0.80
0.70
0.64
0.48
0.40
E
1.0
0.95
0.93
0.90
0.85
0.80
0.75
0.70
0.60
F
1.0
0.98
0.96
0.94
0.92
0.90
0.88
0.86
0.84
G
0.82
0.80
0.78
0.76
0.74
0.72
0.70
0.68
0.66
H
0.64
0.62
0.60
0.58
0.56
0.54
0.52
0.50
0.48
To determine ampere rating (Ir), multiply sensor rating (In) by the long-time
pickup setting. For example:
•
•
•
In = 2000A
Long-time pickup setting = 0.70
Therefore Ir = 2000A x 0.70 = 1400A
Per the National Electrical Code 240.6(C) a circuit breaker that has
restricted access to the adjusting means shall be permitted to have an
ampere rating that is equal to the adjusted long-time pickup setting.
Restricted access is defined as: (1) removable and sealable covers over the
adjustment means, (2) bolted equipment enclosure doors, (3) locked doors
accessible only to qualified personnel. A flip down cover is provided to
protect the rating plug and long-time pickup setting adjustment. To seal the
trip unit, a wire seal is required.
Ground-Fault Setting
To determine ground-fault setting, multiply sensor plug rating (In) by the
ground-fault pickup setting. For example:
•
•
•
In = 2000A
Ground-fault pickup setting = 0.30
Therefore ground-fault setting = 2000A x 0.30 = 600A
NOTE: Changing the rating plug or long-time setting will not affect groundfault pickup level.
For trip units equipped with ground-fault protection for equipment, the test
push button used for electronic testing of ground-fault protection is located
above the test connector. For other ground-fault current test procedures,
consult the trip unit instruction bulletin.
2
© 2003–2012 Schneider Electric All Rights Reserved
0613DB0301
R12/12, 12/2012
How to Determine Circuit Breaker Ampere Rating
Series B Micrologic Trip Units—
Used with LX, LXI, and LE Circuit
Breakers
06023008
Rating Plug
NOTE: Frame size is not sensor size. For example, an LEL circuit breaker
can have a sensor rating of 250, 400, or 600 amperes.
Table 2:
Interchangeable Rating Plug Kits
Catalog No.
Rating Plug Multiplier Value
ARP040
0.400
ARP050
0.500
ARP056
0.563
ARP058
0.583
ARP060
0.600
ARP063
0.625
ARP067
0.667
ARP070
0.700
ARP075
0.750
ARP080
0.800
ARP083
0.833
ARP088
0.875
ARP090
0.900
ARP100
1.000
Determine sensor rating from label on circuit breaker face.
Ampere rating = sensor size x rating plug multiplier x long-time pickup
setting
.75
RATING PLUG
.8
.9
.7
CAT NO. : ARP100
Max. Ampere Rating (P) = Sensor (S) x 100%
.95
.6
.5
1.0
PICKUP
x P
AMMETER / TRIP INDICATOR
PHASE
SELECT
4
7
SHORT TIME
I2 t OUT
P
H
INDICATOR
A
RESET
S
E
Press and Hold
for Ammeter Reset
% of Rating
6
8
4.5
----0
20
40
60
80
2
100
.5
10
3
DELAY
8
I2 t IN
2.5
PICKUP
x P
.25
.2
INSTANT.
.2
.2
.1
.1
.45
.3
8
OFF
.55
.65
.75
PICKUP
GROUNDAUL
F T
.5
.32
12
14
SEC. AT
6xP
.35
7
3
I 2 t OUT
.5
.32
6
4
6
2
PICKUP
x P
LONG TIME
5
5
3
2.5
2
I t IN
.5
.32
.32
.2
.2
.1
.1
DELAY
DELAY
SEC. AT
12 x P
SEC. AT
1xS
FLASH=90%
ON = OVERLOAD
micrologic
FULL-FUNCTION
SERIES B
Wire Seal
Ground-Fault Setting
Per the National Electrical Code 240.6(C) a circuit breaker that has
restricted access to the adjusting means shall be permitted to have an
ampere rating that is equal to the adjusted long-time pickup setting.
Restricted access is defined as: (1) removable and sealable covers over the
adjustment means, (2) bolted equipment enclosure doors, (3) locked doors
accessible only to qualified personnel. Sealable covers are provided using
an optional wire seal (catalog no. MICROTUSEAL). Two seals are required
per circuit breaker, one for the rating plug and one on the clear trip
adjustments cover.
To determine ground-fault setting multiply sensor size (In) by the groundfault pickup setting.
NOTE: Ground-fault pickup level is not a function of rating plug or long-time
setting, only sensor rating.
An optional ground-fault test panel is available. For other ground-fault
system field testing, consult the circuit breaker instruction bulletin.
© 2003–2012 Schneider Electric All Rights Reserved
3
How to Determine Circuit Breaker Ampere Rating
Data Bulletin
Schneider Electric
3700 Sixth St. SW
Cedar Rapids, IA 52404 USA
1-888-778-2733
www.schneider-electric.us
4
0613DB0301
R12/12, 12/2012
Electrical equipment should be installed, operated, serviced, and maintained only by
qualified personnel. No responsibility is assumed by Schneider Electric for any
consequences arising out of the use of this material.
Square D™, Schneider Electric™, Micrologic™, PowerPact™, and Masterpact™ are
trademarks or registered trademarks of Schneider Electric. Other trademarks used
herein are the property of their respective owners.
© 2003–2012 Schneider Electric All Rights Reserved