Selecting Thermal Units

Manual
Starters
FHP

2510
2512
8908

F

A

FHP

Table 43Type A thermal units for full-load currents lower than those listed in this table are available. For complete information, consult Customer Care Center at 1-888-778-2733.*

—

—

Manual Starters
(Small
Enclosure)

2510

M, T

A

M–0

  Table 1 

Table 72

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

M–1

Table 1

Table 72

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

M–1P

Table 1

Table 72

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

Manual
Starters
(Large
Enclosure)

2510
2511
2512
8925

M, T

A

M–0
M–1
M–1P

Table 2

Table 73

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

DC
Magnetic
Starters

EC & M Crane Control Product

7135
7136
7735
7736

C, D

—

1, 2

 Table 65

—

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

E

—

3

  Table 9

—

—

F

—

4

 Table 10

—

—

G

—

5

 Table 12

—

—

AC
Magnetic
Starters
(Small
Enclosure)

8536
8904Small 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.*
(Starter
In Own
Enclosure)

8933
8998
8999
(Model 3
Control Center)

I-LINE^™

and QMB
Motor
Starter
Centers

A
(8536
only)

B, C

00

 Table 17Type A thermal units for full-load currents lower than those listed in this table are available. For complete information, consult Customer Care Center at 1-888-778-2733.*

—

—

SA

A, B

00

 Table 13

—

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

SB

A

0

 Table 13

Table 74

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

SC

A

1

 Table 13

Table 74

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

A

1P

 Table 41

—

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

SD

A

2

 Table 56

Table 75

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

SE

A

3

 Table 18

Table 76Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

Table 134This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.* Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

SF

A

4

 Table 54

—

—

SG

A

5

 Table 49

—

—

BDivide the motor FLC by 60 and use this quotient to select the appropriate thermal units.*

5

 Table 59

Table 83

—

SH

A, B

6

 Table 21

—

—

AC
Magnetic
Starters
(Small
Enclosure)

8998
8999
(Model 4
Control Center)

SC

A

1 Fusible

 Table 66

Table 74

—

1 Circuit Breaker

 Table 15

Table 74

—

SD

A

2 Fusible

 Table 67

Table 75

—

2 Circuit Breaker

 Table 58Use for autotransformer starters (fusible and circuit breaker).*

Table 75

—

SE

A

3 Small Enclosure

 Table 16

Table 76Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

Table 134 This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

3 Large Enclosure

 Table 68Use for autotransformer starters (fusible and circuit breaker).*

Table 76Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

Table 133This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.* Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

SF

A

4

 Table 61

—

—

SG

A

5

 Table 24

—

—

SH

A

6

 Table 20

—

—

AC
Magnetic
Starters
(Small
Enclosure)

8998
(Model 5 and
Model 6 MCCs)

SCRefers to the starter Type number in the MCC, not the Type number of the MCC.*

A

1

Table 109

—

—

1 COMPAC 6

Table 104

—

—

SD Refers to the starter Type number in the MCC, not the Type number of the MCC.*

A

2

Table 110

—

—

SERefers to the starter Type number in the MCC, not the Type number of the MCC.*

A

3

Table 111

—

—

SFRefers to the starter Type number in the MCC, not the Type number of the MCC.*

A

4

Table 112

—

—

SGRefers to the starter Type number in the MCC, not the Type number of the MCC.*

A

5

Table 113

—

—

B

5 CT

Table 103

—

—

SH Refers to the starter Type number in the MCC, not the Type number of the MCC.*

A

6

Table 114

—

—

8911

DPSG

C

20–30 A

Table 135

—

—

40 A

Table 145

—

—

A

50 A

Table 146

—

—

AC
Magnetic
Starters
(Large
Enclosure)

8198

G, S

—

—

Table 5

—

8536

(Starter Used in
Multi-Motor Panel)

8538, 8904Large enclosure tables apply for Class 8904 combination and reversing starters. For non-combination and non-reversing Class 8904 starters, see small enclosure selections above in this table.*

8539, 8906

8606, 8907

8630For Class 8630 starters, divide the delta-connected motor full-load current by 1.73, and use this quotient to select thermal units.*, 8920

8640For Class 8640 and Class 8940starters (MD, PD, ME, PE, MF, PF, MG and PG), use the full-load current of each motor winding as a basis for thermal unit selection—normally one-half the total motor current.*, 8922

9089, 8924

8647, 8925

8650, 8930

8736, 8738,
8739, 8941

A (8536 only)

B, C

00

Table 14Type A thermal units for full-load currents lower than those listed in this table are available. For complete information, consult the Customer Care Center at 1–888–778–2733.*

—

—

SA

A, B

00

Table 53

—

SB, NB

A

0

Table 15

Table 78

SC, NC

A

1

Table 15

Table 78

SD, ND

A

2

Table 58

Table 79

SE, NE

A

3

Table 16

Table 80Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

Table 133Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.* This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

SF, NF

A

4

Table 61

—

—

SG

A

5

Table 24

—

—

BDivide the motor FLC by 60, and use this quotient to select the appropriate thermal units.*

5

Table 59

Table 83

—

SH

A, B

6

Table 20

—

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

AC
Magnetic
Starters
(Large
Enclosure)

8810, 8811
8812

CB, DB, SB, UB

A

0

Table 15

Table 78

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

CC, DC, SC, UC

A

1

Table 15

Table 78

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

CD, DD, SD, UD

A

2

Table 58

Table 79

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

CE, DE, SE, UE

A

3

Table 16

Table 80Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

Table 133Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.* This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

CF, DF, SF, UF

A

4

Table 61

—

—

CG, DG, SG, UG

A

5

Table 24

—

—

BDivide the motor FLC by 60, and use this quotient to select the appropriate thermal units.*

5

Table 59

Table 83

—

CH, DH, SH, UH

A

6

Table 20

—

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

8940

WELL-GUARD™
Control

WC, XC

A

1

Table 13

Table 78

—

WD, XD, MD, RD, VD

A

2

Table 56

Table 79

—

WE, XE, ME, RE, VE

A

3

Table 18

Table 80Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.*

—

PF, WF, XF, MF, RF, VF, PE

A

4

Table 54

—

—

8911

DPSO

C

20–30 A

Table 136

—

—

40 A

Table 147

—

—

A

50 A

Table 148

—

—

AC
Magnetic
Part-
Winding

8998
(Model 5 and
Model 6 MCCs)

SCRefer to the Type number of the starter in the MCC, not the Type number of the MCC.*

A

1

Table 127

—

—

SDRefer to the Type number of the starter in the MCC, not the Type number of the MCC.*

A

2

Table 128

—

—

SERefer to the Type number of the starter in the MCC, not the Type number of the MCC.*

A

3

Table 129

—

—

SF

A

4

Table 105

—

—

SG

A

5

Table 115

—

—

BDivide the motor FLC by 60, and use this quotient to select the appropriate thermal units.*

5 CT

Table 116

—

—

Separately Mounted Overload Relays

9065

C

A

1 (25 A)

 Table 44

Table 82

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

F

B

4 (133 A)

 Table 19

—

—

G

A

5 (266 A)

Table 22

—

—

MEO

A

(32 A)

 Table 86

—

—

S

A

1 (26 A)

 Table 59

Table 83

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

2 (45 A)

 Table 69

Table 84

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

3 (86 A)

 Table 34

—

—

4 (133 A)

 Table 28

—

—

T

A

2 (45 A)

 Table 31

—

This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Selecting Slow Trip Thermal Units.*

U

—

3 (86 A)

 Table 40

—

—