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Thermal Units

Thermal Unit Selection Thermal Unit Selection Tables

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Thermal Unit Selection

Table 16.368: Thermal Unit Selection

Thermal Unit Selection Table Number Hand Reset Melting Alloy

Controller

Standard Trip (20)

QuickTrip (10)

SlowTrip (30)

Starter Type

Type

Series [9]

Class

Size

G, S

[10]

8198

—

—

5

—

8536 (Starter Used in Multi-Motor Panel)

A (8536 only)

14 [11]

B,C

00

—

—

8538 8539 8606 16 NEMA AND DEFINITE PURPOSE CONTACTORS AND STARTERS 8630 [13] 8640 [14]

8904 [12]

A, B

[10] [10] [10] [10]

SA

00

53 15 15 58 16 61 24 59 15 15 58 16 61 24 59 20 13 56 18 54 20

— 78 78 79 — — 83 78 78 79 — — 83 — 78 79 — — — — — — — — — — 82 — — — 83 84 — — — — —

SB,NB SC,NC SD,ND SE,NE SF, NF

8906 8907 8920 8922 8924 8925 8930 8941

A A A A A A

0 1 2 3 4 5 5 0 1 2 3 4 5 5 6 1 2 3 4 6

80 [15]

133 [15][10]

9089 8647 8650 8736 8738 8739

— — —

SG

B [16]

A, B

[10]

SH

AC Magnetic Starters (Large Enclosure)

CB, DB, SB, UB CC, DC, SC, UC CD, DD, SD, UD CE, DE, SE, UE CF, DF, SF, UF CG, DG, SG, UG CH, DH, SH, UH

[10] [10] [10]

A A A A A A A A A A A C A A A A A A A B A A

8810 8811 8812

80 [15]

133 [15][10]

— — — — — — — — — — — — — — — — — — —

B [16]

[10]

WC, XC

8940 WELL-GUARD™ Control

WD, XD, MD, RD, VD WE, XE, ME, RE, VE

80 [15]

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

20–30A

136 147 148 127 128 129 105 115 116

8911

DPSO

40A 50A

SC [17] SD [17] SE [17]

1 2 3 4 5

AC Magnetic Part Winding

8998 (Model 5 and Model 6 MCCs)

SF SG

B [16]

5CT

1 (25A) 4 (133A) 5 (266A) 1 (26A) 2 (45A) 3 (86A) 4 (133A) 2 (45A) 3 (86A) (32A)

[10]

C F G

44 19 22 86 59 69 34 28 31 40

MEO

[10] [10]

Separately Mounted Overload Relays

9065

S

A

— —

[10]

T U

A

— — NOTE: For thermal unit selection tables for other devices including obsolete devices, consult the Customer Care Center at 1-888-778-2733.

[9] Series letters listed refer to the marking on the nameplate of the basic openstyle starter. When the starter comes in a controller containing other devices, the controller may have a different series letter marked on the enclosure nameplate. [10] This device will accept Type SB slow trip (Class 30) thermal units. For selection, see page 16-134. [11] Type 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. [12] Large enclosure tables apply for Class8904 combination and reversing starters. For non-combination and non-reversing Class8904 starters refer to small enclosure selections, page 16 135. [13] For Class8630 starters, divide the delta-connected motor full-load current by 1.73, and use this quotient to select thermal units. [14] For Class8640 and Class8940 starters (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. [15] FormY81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters.

[16] Divide the motor FLC by 60, and use this quotient to select the appropriate thermal units. [17] Refers to the Type number of the starter in the MCC, not the Type number of the MCC.

16-136

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