Master Square D Thermal Unit Selection Table

 

Controller
Thermal Unit Selection Table Number
Hand Reset Melting Alloy
Bimetallic
Starter Type
Class
Type
Series a
Size
Standard
Trip (20)
Quick Trip
(10)
Slow Trip
(30)
Non-
Compensated
Compen-
sated
Manual
Starters
FHP
2510
2512
8908
F
A  
FHP
43 h
...
...  
...  
...  
Manual Starters
(Small
Enclosure)
2510
M, T
A  
M–0
M–1
M–1P
1
1
1
j
j
j
...
...
...  
...
...
...  
Manual
Starters
(Large
Enclosure)
2510
2511
2512
8925
M, T
A  
M–0
M–1
M–1P
2
2
2
j
j
j
...
...
...  
...
...
...  
Manual
Loom Sw.
2510
MBL, TBL
A  
M–0
7
...
j
...  
...  
DC
Magnetic
Starters
7135
7136
7735
7736
C, D
...  
1,2
...
j  
...  
...  
E
...  
3
9
...
...  
...  
...  
F
...  
4
...
...  
...  
...  
G
...  
5
...
...  
...  
...  
 
8536
8904b
(Starter
In Own
Enclosure)
 
8933
 
8998
8999
(Model 3
Control Center)
I-LINE®
and QMB
Motor
Starter
Centers
A
(8536
only)
B, C  
00
17 h
...
...  
...  
...  
SA
A, B  
00
...
j  
...  
...  
SB
A  
0
j  
8
SC
A  
1
j
8
A
1P
...
j  
...  
...  
SD
A  
2
j  
SE
A  
3
134ij  
37 g
B  
3
...
...
...  
...  
SF
A  
4
...
29g 
B  
4
...
...
...  
...  
SG
A  
5
...
...  
Bl  
5
...
SH
A, B  
6
...
...  
8998
8999
(Model 4
Control Center)
SC
A  
1 Fusible
...  
1 Circuit Breaker
...  
SD
A  
2 Fusible
...  
2 Circuit Breaker
58 f
...  
SE
A  
3 Small Enclosure
16 
3 Large Enclosure
68 f
 
 
B  
3
...
...
...  
...  
SF
A  
4
...  
B  
4
...
...
...  
...  
SG
A  
5
...
...  
SH
A  
6
...
...  
8998
(Model 5 and
Model 6 MCCs)
SCk
A  
1
...
...  
...  
1 COMPAC 6
...
...  
...  
...  
SDk
A  
2
...
...  
...  
SEk
A  
3
...
...  
...  
SFk
A  
4
...
...  
...  
SGk
A  
5
...
...  
...  
Bl  
5 CT
...
...  
...  
...  
SHk
A  
6
...
...  
...  
8911
DPSG
A  
20–30 A
...
...  
...  
...  
40 A
...
...  
...  
...  
50 A
...
...  
...  
...  
60–90 A
...
...  
...  
...  
AC
Magnetic
Starters
(Large
Enclosure)  
8198
G, S
...  
...
5
...
j  
...  
6
8536
(Starter Used in
Multi-Motor Panel)
8538   8904e
8539   8906
8606   8907
8630c  8920
8640d  8922
9089   8924
8647   8925
8650   8930
8736   8941
8738   
8739   
A
(8536 only)
B, C  
00
14 h
...
...  
...  
...  
SA
A, B  
00
...
j  
SB, NB
A  
0
j  
SC, NC
A  
1
j  
SD, ND
A  
2
j  
SE, NE
A  
3
133ij  
B  
3
...
...
...  
...  
SF, NF
A  
4
...  
B  
4
...
...
...  
...  
SG
A  
5
...
...  
Bl  
5
...  
SH
A, B  
6
...
j  
8810
8811
8812
CB, DB, SB, UB
A  
0
j  
CC, DC, SC, UC
A  
1
j  
CD, DD, SD, UD
A  
2
j
CE, DE, SE, UE
A  
3
133ij  
CF, DF, SF, UF
A  
4
...  
SE
B  
3
...
...
...  
...  
SF
B  
4
...
...
...  
...  
CG, DG, SG, UG
A  
5
...
...  
Bl  
5
...  
CH, DH, SH, UH
A  
6
...
j  
8940
WELL-GUARD®
Control
WC, XC
A  
1
...  
...  
WD, XD, MD,
RD, VD
A  
2
...  
...  
WE, XE, ME,
RE, VE
A  
3
...  
...  
PF, WF, XF, MF,
RF, VF, PE
A  
4
...  
...  
XSG, NSG, MG,
RG, VGh
A  
5
...
...
...  
...  
Bl  
5
...
...
...  
...  
XSH, VH
A  
6
...
...
...  
...  
8911
DPSO
A  
20–30 A
...
...  
...  
...  
40 A
...
...  
...  
...  
50 A
...
...  
...  
...  
60–90 A
...
...  
...  
...  
AC
Magnetic
Part-
Winding  
8998
(Model 5 and
Model 6 MCCs)
SCk
A  
1
...
...  
...  
SDk
A  
2
...
...  
...  
SEk
A  
3
...
...  
...  
SF
A  
4
...
...  
...  
SG
A  
5
...
...  
...  
Bl  
5 CT
...
...  
...  
...  
Separately
Mounted
Overload
Relays  
9065
AF
B  
4(133 A)
...
...
...  
...  
AG
A  
5(266 A)
...
...
...  
...  
AR
A  
1(25 A)
...
...
...  
...  
AT
A  
2(45 A)
...
...
...  
...  
AU
...  
3(86 A)
...
...
...  
...  
DA
A  
1(25 A)
...
...
...  
...  
GA
A  
2(60 A)
...
...
...  
...  
HA
A  
3(100 A)
...
...
...  
...  
JA
A  
4(180 A)
...
...
...  
...  
C
A  
1(25 A)
j
...  
...  
F
B  
4(133 A)
...  
...  
...  
G
A  
5(266 A)
...
...  
...  
...  
MEO
A  
(32 A)
...
...  
...  
...  
S
A  
1(26 A)
j  
2(45 A)
j  
3(86 A)
...
...  
...  
...  
4(133 A)
...
...  
...  
...  
T
A  
2(45 A)
...
j  
...  
...  
U
...  
3(86 A)
...
...  
...  
...  

a Series letters listed refer to the marking on the nameplate of the basic open type starter. When the starter is supplied in a controller containing other devices, the controller may have a different series letter marked on the enclosure nameplate.
b Small enclosure tables apply for Class 8904 non-combination and non-reversing starters. For combination and reversing Class 8904 starters refer to the large enclosure selections, index above.
c For Class 8630 starters divide the delta connected motor full load current by 1.73, and use this quotient to select thermal units.
d For Class 8640 and Class 8940 (MD, PD, ME, PE, MF, PF, MG and PG) starters use the full load current of each motor winding as a basis for thermal unit selection—normally one-half total motor current.
e Large enclosure tables apply for Class 8904 combination and reversing starters. For non-combination and non-reversing Class 8904 starters refer to small enclosure selections.
f Use for Autotransformer Starters (Fusible and Circuit Breaker).
g Order Type E thermal units by number from Square D/Schneider Electric, Furnas Electric Company, Batavia, Illinois or a Furnas distributor at $9.00 each, subject to motor control discounts.
h Type A thermal units for full load currents lower than those listed in this table are available. For more information call Southland Electrical Supply 1-800-476-1486.
i Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters and quick trip (Class 10) thermal units on Size 4 starters.
j This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Slow Trip Thermal Unit Selection.
k Refers to type number of starter in MCC, not actual type number of MCC.
l Divide the motor FLC by 60 and use this quotient to select the appropriate thermal units.

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