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Data Bulletin 0100DB0902 R06/1308/2013Replaces 0100DB0902R04/11, 04/2011
Guide to Low Voltage Transformer Protection and Selective CoordinationRetain for future use.
20112013 Schneider Electric All Rights Reserved
Introduction Use this guide for selecting transformer primary circuit breaker, secondary circuit breaker and the largest branch circuit breakers for total selective coordination. The circuit breaker selections conform to the NEC Article 450 requirements for transformer protection while providing total selectivity for the circuits.
See How To Use This Guide, on page 3, for additional information.
Use the Guidelines below for tips on working through systems for selective coordination.
NOTE: It is still necessary to perform an engineering study to determine the specific requirements of each system.
Guidelines
Know Your State and Municipal Code Understand your state and local municipalitys adoption and enforcement regarding the National Electrical Code (NEC). Part of understanding local code adoption and enforcement is understanding the threshold of selective coordination required0.1s (TCCs) or total, for the full operating range of the protective devices (which typically uses look-up tables). This guide assumes total selective coordination is required.
Lighting Panelboard Recommendations In general, do not feed lighting panelboards from other lighting panelboards unless there is a transformer in between them.
Better levels of selective coordination are available with 225 A and larger panelboards.
Consider using main lugs panelboards.
Bottom-Up Coordination When selectively coordinating a system, work from the loads towards the source(s), coordinate the branch panels first, then the power distribution panels, then the switchboard or switchgear.
Sizing Upstream Circuit Breakers The upstream circuit breaker should be at least one frame size larger than the downstream circuit breaker. This may necessitate increasing the size of panelboards and feeder conductors.
Very high levels of short circuit selective coordination may be achieved by using high ampere frame electronic trip circuit breakers with low ampere sensors and/or lower ampere rating adjustments.
Overlapping Time Current Curves (TCCs) When there is no overlap (at any point) of the TCCs below the available short circuit current at the downstream panel, the circuit breakers are fully coordinated.
When there is overlap in the short circuit zone, use the short circuit selective coordination tables in document number 0100DB0501, Short Circuit Selective Coordination for Low Voltage Circuit Breakers or
Guide to Low Voltage Transformer Protection and Selective Coordination 0100DB0902 R06/13Data Bulletin 08/2013
20112013 Schneider Electric All Rights Reserved2
document number 0100DB0604, Selectivity Guidelines for Square D Panelboards.
Automatic Transfer Switch (ATS) Withstand Ratings
Make sure automatic transfer switches have adequate withstand ratings.
It may be necessary to relocate the switch, or It may be necessary to increase the size of the switch.
Mixing of Overcurrent Protective Devices (OCPD)
Time-Current Curves (TCC) may be used so long as the fault current does not exceed the instantaneous trip point of the upstream breaker
OCPD from different manufacturers or different types cannot be mixed if the fault current is outside of the parameters describe above.
Arc Flash Incident Energy Consider how selective coordination impacts the arc flash Protective Personnel Equipment (PPE) levels.
It may be possible to reduce arc flash incident energy with Zone Selective Interlocking (ZSI).
Nesting Time-Current Curves The time-current curve of a thermal magnetic circuit breaker can sometimes be nested underneath the time-current curve of an upstream electronic trip circuit breaker.
Circuit Breaker Withstand Capacity Molded case circuit breakers (UL 489) used for coordination:
New H frame (U) with Micrologic trip unit
New J-Frame (W) circuit breakersselectively coordinate up to 18kA with 240/120V Circuit Breakers
New L-Frame (W) circuit breakersselectively coordinate up tp 30kA with 240V and 480Y/277V
LA/LH MC (mission critical) circuit breakerselectively coordinate up to 22 kA with 120 V circuit breakers (obsolete)
D-Frame MC (mission critical) circuit breakerselectively coordinate up to 30 kA with 120 V circuit breakers (obsolete)
PowerPact PG/PK and RG/RK circuit breakersselectively coordinate up to 65 kA with 277 V Circuit Breakers
Masterpact NW circuit breakersselectively coordinate up to 100 kA with larger molded case circuit breakers
Refer to 0100DB0501 for complete, total selectivity tables.
Field Adjustment Do not neglect to properly adjust circuit breakers in the field as all Square D low voltage circuit breakers are shipped from the factory with all but the ampere-rating switch in the lowest position.
As a Last Resort . . . Change the upstream circuit breaker type to an insulated case circuit breaker or a low voltage power circuit breaker.
Reduce the voltage if the desired level of selective coordination cannot be achieved using a 480Y/277 Vac panelboard. Consider feeding a 208Y/120 Vac panelboard through a transformer.
Split up some of the loads and use multiple smaller transformersavoid feeding a 100 A/208 V panel from another 208 V panel.
Insert impedance through longer run of wire or higher impedance transformers or reactors.
0100DB0902 R06/13 Guide to Low Voltage Transformer Protection and Selective Coordination08/2013 Data Bulletin
20112013 Schneider Electric All Rights Reserved 3
How To Use This Guide 1. Determine the available fault current on primary side of transformer and choose the appropriate reference table.
a. 35 kA/18 kA b. 65 kAc. 100 kA
2. Locate the transformer size on far left of chart. Options are available up to 225 kVA.
3. Based on the specification requirement for aluminum or copper transformer windings, read the available circuit breaker combinations for primary, secondary (main), and branch circuit breakers for a selectively coordinated system.
4. Choose the circuit breaker combination that best suits your system requirements.
a. The primary circuit breaker should be selected as the device feeding the transformer, whether in a panelboard or circuit breaker enclosure.
b. The secondary circuit breaker should be selected as the main circuit breaker in the panelboard downstream of the transformer; or optionally, could be mounted in a circuit breaker enclosure to feed a main lugs only panelboard.
c. The branch circuit breakers are listed to show the maximum size that can be applied to a full selectively coordinated system. Additionally, notation is made to present which style of QO(B) circuit breaker is required based on current rating and number of poles.
5. Reference data bulletin 0100DB0501 if additional circuit breaker selections are required upstream from the primary circuit breaker to complete the system. This data bulletin is a comprehensive resource for selectively coordinated circuit breaker combinations within the same voltage system.
Guide to Low Voltage Transformer Protection and Selective Coordination 0100DB0902 R06/13Data Bulletin 08/2013
20112013 Schneider Electric All Rights Reserved4
Qui
ck R
efer
ence
Gui
de fo
r Sel
ectiv
e C
oord
inat
ion
Bas
ed o
n 35
kA
Ava
ilabl
e Fa
ult C
urre
nt o
n 48
0 Va
c Pr
imar
y
Inpu
t Circ
uit B
reak
er
Mai
n C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
Tran
sfor
mer
AB C
D
Not
es a
bout
usi
ng th
is Q
uick
Ref
eren
ce G
uide
:Th
is ta
ble
is n
ot m
eant
to re
plac
e a
sele
ctiv
e co
ordi
natio
n sy
stem
stu
dy. T
he p
urpo
se o
f thi
s gu
ide
is fo
r act
iviti
es th
at o
ccur
bef
ore
the
final
sy
stem
stu
dy, s
uch
as q
uota
tion
and
itera
tive
desi
gn c
hang
es, t
o in
crea
se th
e ch
ance
of d
evic
e co
mbi
natio
ns b
eing
sel
ectiv
ely
coor
dina
ted.
The
devi
ce c
ombi
natio
ns p
rese
nted
in th
is g
uide
repr
esen
t a le
vel o
f "to
tal"
sele
ctiv
e co
ordi
natio
n, w
here
the
devi
ces
wer
e ch
osen
bas
ed o
nth
e m
axim
um le
t-thr
ough
cur
rent
. N
EC
requ
irem
ents
for t
rans
form
er p
rote
ctio
n w
ere
also
follo
wed
in th
e se
lect
ion
of th
e de
vice
com
bina
tions
.Tr
ansf
orm
ers
are
480
V p
rimar
y w
ith 2
08Y/
120
V se
cond
ary.
Tabl
e1:
Sele
ctiv
e C
oord
inat
ion
Dev
ice
Com
bina
tions
(35
kA)
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e8
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
15
Alu
min
umEE
15T3
H5.
1
EG12
535
HD
150
60
30Q
O(B
)Q
O(B
)
QO
(B)
HG
150
35
HG
U
3.2
6025
252
8
HG
_U
3.2S
6040
40
10
8
HG
_U
5.2/
6.2
6040
402
100
8
Cop
per
EE15
T3H
CU
4.6
EG12
535
H
D_U
3.2
150/
6060
60 A
2
15
30Q
O(B
)Q
O(B
)
QO
(B)
D
-MC
*60
0/15
060
(0.5
)(0.8
)4
30
QO
(B)
QO
(B)
Q
O(B
)-VH
HG
150
40
HD
_U 3
.215
0/60
6060
A2
1530
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
150
60(0
.5)(0
.8)
4
30Q
O(B
)Q
O(B
)
QO
(B)-V
H
HG
_U
3.2
6035
352
8H
D_U
3.2
150/
6060
60 A
2
15
30Q
O(B
)Q
O(B
)
QO
(B)
D
-MC
*60
0/15
060
(0.5
)(0.8
)4
30
QO
(B)
QO
(B)
Q
O(B
)-VH
H
G_U
3.
2S60
4040
10
8
HD
_U 3
.215
0/60
6060
A2
1530
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
150
60(0
.5)(0
.8)
4
30Q
O(B
)Q
O(B
)
QO
(B)-V
H
HG
_U
5.2/
6.2
6040
402
100
8H
D_U
3.2
150/
6060
60 A
2
15
30Q
O(B
)Q
O(B
)
QO
(B)
D
-MC
*60
0/15
060
(0.5
)(0.8
)4
30
QO
(B)
QO
(B)
Q
O(B
)-VH
*
NO
TE: D
-MC
and
L-M
C c
ircui
t bre
aker
s ar
e ob
sole
te.
Con
tinue
d on
nex
t pag
e
AB
CD
Guide to Low Voltage Transformer Protection and Selective Coordination 0100DB0902 R06/13Data Bulletin 08/2013
20112013 Schneider Electric All Rights Reserved5
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e8
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
30A
lum
inum
EE30
T3H
5.5
EG12
580
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
D-M
C*
600/
150
125
(0.9
)(0.9
5)4
60
QO
(B)
QO
(B)
Q
O(B
)-VH
HG
150
70
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
D-M
C*
600/
150
125
(0.9
)(0.9
5)4
60
QO
(B)
QO
(B)
Q
O(B
)-VH
HG
_U
3.2
100
5050
2
8
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
D-M
C*
600/
150
125
(0.9
)(0.9
5)4
60
QO
(B)
QO
(B)
Q
O(B
)-VH
HG
_U
3.2S
100
5050
10
8
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
HG
_U
5.2/
6.2
100
5050
210
08
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
* N
OTE
: D-M
C a
nd L
-MC
circ
uit b
reak
ers
are
obso
lete
.C
ontin
ued
on n
ext p
age
Tabl
e1:
Sele
ctiv
e C
oord
inat
ion
Dev
ice
Com
bina
tions
(35
kA)
AB
CD
Guide to Low Voltage Transformer Protection and Selective Coordination 0100DB0902 R06/13Data Bulletin 08/2013
20112013 Schneider Electric All Rights Reserved6
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e8
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
30C
oppe
rEE
30T3
HC
U4.
6
EG12
580
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
D-M
C*
600/
150
125
(0.9
)(0.9
5)4
60
QO
(B)
QO
(B)
Q
O(B
)-V
H
HG
150
80
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
D-M
C*
600/
150
125
(0.9
)(0.9
5)4
60
QO
(B)
QO
(B)
Q
O(B
)-V
H
HG
_U
3.2
100
5050
2
10
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
D-M
C*
600/
150
125
(0.9
)(0.9
5)4
60
QO
(B)
QO
(B)
Q
O(B
)-V
H
HG
_U
3.2S
100
5050
10
10
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
HG
_U
5.2/
6.2
100
5050
210
010
HD
_U 3
.215
0/15
012
512
5 A
2
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
3.2
S15
0/15
012
512
5 A
10
15
60Q
O(B
)Q
O(B
)
QO
(B)
H
D_U
5.
2/6.
215
0/15
012
512
5 A
210
015
60Q
O(B
)Q
O(B
)
QO
(B)
45
Alu
min
umEE
45T3
H6.
0
EG12
580
JD
_W 3
.225
017
517
5 A
4
80Q
O(B
)Q
O(B
)
QO
(B)
D
-MC
*60
0/25
017
5(0
.7)(
1)8
80
QO
(B)
QO
(B)
Q
O(B
)-V
H
HG
150
150
JD
_W 3
.225
017
517
5 A
4
80Q
O(B
)Q
O(B
)
QO
(B)
D
-MC
*60
0/25
017
5(0
.7)(
1)8
80
QO
(B)
QO
(B)
Q
O(B
)-V
H
HG
_U
3.2
100
7070
4
12
JD_W
3.2
250
175
175
A4
80
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
175
(0.7
)(1)
8
80Q
O(B
)Q
O(B
)
QO
(B)-
VH
H
G_U
3.
2S10
010
010
0
10
12JD
_W 3
.225
017
517
5 A
4
80Q
O(B
)Q
O(B
)
QO
(B)
D
-MC
*60
0/25
017
5(0
.7)(
1)8
80
QO
(B)
QO
(B)
Q
O(B
)-V
H
HG
_U
5.2/
6.2
100
100
100
210
012
JD_W
3.2
250
175
175
A4
80
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
175
(0.7
)(1)
8
80Q
O(B
)Q
O(B
)
QO
(B)-
VH
Cop
per
EE45
T3H
CU
4.4
HG
_U
3.2
100
7070
4
15
JD_W
3.2
250
175
175
A4
80
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
175
(0.7
)(1)
8
80Q
O(B
)Q
O(B
)
QO
(B)-
VH
H
G_U
3.
2S10
010
010
0
10
15JD
_W 3
.225
017
517
5 A
4
80Q
O(B
)Q
O(B
)
QO
(B)
D
-MC
*60
0/25
017
5(0
.7)(
1)8
80
QO
(B)
QO
(B)
Q
O(B
)-V
H
HG
_U
5.2/
6.2
100
100
100
210
015
JD_W
3.2
250
175
175
A4
80
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
175
(0.7
)(1)
8
80Q
O(B
)Q
O(B
)
QO
(B)-
VH
*
NO
TE: D
-MC
and
L-M
C c
ircui
t bre
aker
s ar
e ob
sole
te.
Con
tinue
d on
nex
t pag
e
Tabl
e1:
Sele
ctiv
e C
oord
inat
ion
Dev
ice
Com
bina
tions
(35
kA)
AB
CD
0100DB0902 R06/13 Guide to Low Voltage Transformer Protection and Selective Coordination08/2013 Data Bulletin
20112013 Schneider Electric All Rights Reserved 7
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e8
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
75A
lum
inum
EE75
T3H
3.7
JG_U
3.
225
012
512
54
12
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
JG_U
3.
2S25
012
512
5
10
12
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
JG_U
5.
2/6.
225
012
512
54
100
12
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
LA/L
H
MC
400
200
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
*
NO
TE: D
-MC
and
L-M
C c
ircui
t bre
aker
s ar
e ob
sole
te.
Con
tinue
d on
nex
t pag
e
Tabl
e1:
Sele
ctiv
e C
oord
inat
ion
Dev
ice
Com
bina
tions
(35
kA)
AB
CD
Guide to Low Voltage Transformer Protection and Selective Coordination 0100DB0902 R06/13Data Bulletin 08/2013
20112013 Schneider Electric All Rights Reserved8
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e8
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
75C
oppe
rEE
75T3
HC
U3.
5
JG_U
3.
225
012
512
54
12
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
JG_U
3.
2S25
012
512
5
10
12
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
JG_U
5.
2/6.
225
012
512
54
100
12
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
LA/L
H
MC
400
200
JD_W
3.2
250
225
250
225
8
12
100
QO
(B)
QO
(B)
Q
O(B
)
JD_W
3.2
S25
022
525
022
5
10
1210
0Q
O(B
)Q
O(B
)
QO
(B)
JD
_W
5.2/
6.2
250
225
250
225
810
012
100
QO
(B)
QO
(B)
Q
O(B
)
D-M
C*
600/
250
600/
400
225
250
225
300
(0.9
)(1)
(0.7
)(0.8
)16
10
0Q
O(B
)Q
O(B
)
QO
(B)-V
H9
L-M
C*
400
225
300
10
0Q
O(B
)Q
O(B
)3
QO
(B)4
*
NO
TE: D
-MC
and
L-M
C c
ircui
t bre
aker
s ar
e ob
sole
te.
Con
tinue
d on
nex
t pag
e
Tabl
e1:
Sele
ctiv
e C
oord
inat
ion
Dev
ice
Com
bina
tions
(35
kA)
AB
CD
0100DB0902 R06/13 Guide to Low Voltage Transformer Protection and Selective Coordination08/2013 Data Bulletin
20112013 Schneider Electric All Rights Reserved 9
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e8
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
112.
5
Alu
min
umEE
112T
3H5.
2
JG_U
3.
225
017
517
54
12
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
JG_U
3.
2S25
017
517
5
10
12
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
JG_U
5.
2/6.
225
017
517
54
100
12
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
LA/L
H
MC
400
200
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
Cop
per
EE11
2T3H
CU
3.9
JG_U
3.
225
017
517
54
10
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
JG_U
3.
2S25
017
517
5
10
10
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
JG_U
5.
2/6.
225
017
517
54
100
10
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
LA/L
H
MC
400
200
LD_W
3.3
400
400
400
4
12
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S40
040
040
0
10
1215
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
400
400
400
410
012
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
400
300
400
(0.8
)(0.9
5)16
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
* N
OTE
: D-M
C a
nd L
-MC
circ
uit b
reak
ers
are
obso
lete
.C
ontin
ued
on n
ext p
age
Tabl
e1:
Sele
ctiv
e C
oord
inat
ion
Dev
ice
Com
bina
tions
(35
kA)
AB
CD
Guide to Low Voltage Transformer Protection and Selective Coordination 0100DB0902 R06/13Data Bulletin 08/2013
20112013 Schneider Electric All Rights Reserved10
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e8
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
150
Alu
min
umEE
150T
3H6.
0
LG_U
3.
340
022
522
54
10
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600
600
(1)(
1)2
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
LG_U
3.
3S40
022
522
5
10
10
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600
600
(1)(
1)2
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
LG_U
5.
3/6.
340
022
522
54
100
10
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600
600
(1)(
1)2
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
LA/L
H
MC
400
225
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600
600
(1)(
1)2
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
Cop
per
EE15
0T3C
U4.
7
LG_U
3.
340
022
522
54
12
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
600
600
(1)(
1)2
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
LG_U
3.
3S40
025
025
0
10
12
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
600
600
(1)(
1)2
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
LG_U
5.
3/6.
340
025
025
04
100
12
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
600
600
(1)(
1)2
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
LA/L
H
MC
400
225
LD_W
3.3
600
600
600
2
11
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
LD_W
3.3
S60
060
060
0
5
1115
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)
QO
(B)-V
HLD
_W
5.3/
6.3
600
600
600
25
011
150
QO
(B)
QO
(B)
QO
(B)-V
HQ
O(B
)Q
O(B
)-VH
D-M
C*
600/
600
600
(1)(
1)2
15
0Q
O(B
)Q
O(B
)Q
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
* N
OTE
: D-M
C a
nd L
-MC
circ
uit b
reak
ers
are
obso
lete
.C
ontin
ued
on n
ext p
age
Tabl
e1:
Sele
ctiv
e C
oord
inat
ion
Dev
ice
Com
bina
tions
(35
kA)
AB
CD
0100DB0902 R06/13 Guide to Low Voltage Transformer Protection and Selective Coordination08/2013 Data Bulletin
20112013 Schneider Electric All Rights Reserved 11
Tran
sfor
mer
P
rimar
y C
ircui
t Bre
aker
Sec
onda
ry C
ircui
t Bre
aker
Bra
nch
Circ
uit B
reak
ers
for
Tota
l Sel
ectiv
e C
oord
inat
ion
Long
Tim
eS
hort
Tim
eLo
ng T
ime
Sho
rt Ti
me
Size
kVA
Gen
eral
Pu
rpos
e Ty
pe
Cat
alog
N
umbe
rs
Min
. Im
ped
-anc
e (%
Z)1
Circ
uit
Brea
ker
Fram
e
Fram
e Si
ze /
Rat
ing
A
Ampe
re
Rat
ing2
ASe
tting
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Circ
uit
Brea
ker
Type
(M
ain)
Fram
e Si
ze /
Rat
ing
Ampe
re
Rat
ing2
(A)
Min
. Se
tting
sM
in.
Del
aySe
tting
Del
ayIn
stan
t-an
eous
Max
. Br
anch
Si
ze5
(A)
1P15
70
A
2P15
100
A
2P11
015
0A
3P15
100
A
3P11
015
0A
225
Alu
min
umEE
225T
3H6.
5
LG_U
3.
340
035
035
04
12
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
LG_U
3.
3S40
035
035
0
10
12
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
LG_U
5.
3/6.
340
035
035
04
100
12
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
LA/L
H
MC
400
400
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
Cop
per
EE22
5T3H
CU
3.8
LG_U
3.
340
035
035
04
12
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
LG_U
3.
3S40
040
040
0
10
12
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
LG_U
5.
3/6.
340
035
035
04
100.
212
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
LA/L
H
MC
400
225
LD_W
3.3
600
6007
600
8
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W 3
.3S
600
6007
600
10
11
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HLD
_W
5.3/
6.3
600
6007
600
810
011
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H
D-M
C*
600/
600
6007
(1)(
1)4
150
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
HQ
O(B
)-VH
QO
(B)-V
H*
NO
TE: D
-MC
and
L-M
C c
ircui
t bre
aker
s ar
e ob
sole
te.
1 V
alue
s re
pres
enta
tive
of im
peda
nce
valu
es fo
r Squ
are
D tr
ansf
orm
ers.
2 A
llow
prim
ary
trip
ratin
g to
incr
ease
to 2
50%
of r
ated
FLC
(NE
C 4
50.4
); se
cond
ary
mai
n tri
p ra
ting
cann
ot e
xcee
d 12
5% o
f rat
ed F
LC.
3 S
elec
tive
with
2 p
ole
QO
(B) t
hrou
gh 8
0 A
ratin
g.4
Sel
ectiv
e w
ith 3
pol
e Q
O(B
) thr
ough
60
A ra
ting.
5 B
ranc
h ci
rcui
t bre
aker
s w
ith a
mpe
re ra
tings
of 5
0%, o
r les
s, o
f the
D-M
C m
ain
circ
uit b
reak
er a
re s
elec
tive.
Val
ues
show
n in
this
col
umn
corr
espo
nd to
the
min
imum
D-M
C tr
ip in
col
umn
to th
e le
ft.6
Sec
onda
ry m
ain
circ
uit b
reak
ers
will
not c
arry
rate
d se
cond
ary
curr
ent o
f 416
A.
7 S
econ
dary
mai
n ci
rcui
t bre
aker
s w
ill no
t car
ry ra
ted
seco
ndar
y cu
rren
t of 3
25 A
.8
Prim
ary
circ
uit b
reak
er s
elec
tions
sho
wn
are
for 3
5 kA
SC
CR
s; if
the
syst
em h
as
Recommended