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Heaters

Heaters are not included with the overload relay and must be 

ordered separately per the heater selection table and the Information 

listed below. When installing heaters be sure that connecting 

surfaces are clean and heaters are attached securely to the relay 

in the proper location with the screws provided. The trip rating of a 

heater in a 40oC Ambient is 125% of the minimum full load current 

shown in 

Table 5 or 6

. When tested at 600 percent of its trip rating, 

the relay will trip in 20 seconds or less (class 20).
The heaters should be selected on the basis of the actual full load 

current and service factor as shown on the motor nameplate or in 

the manufacturer’s published literature. When the service factor of 

the motor is 1.15 to 1.25, select heaters from the heater application 

table. If the service factor of the motor is 1.0, or there is no service 

factor shown, or a maximum of 115% protection is desired, select 

one size smaller heater than indicated. When motor and overload 

relay are in different ambient and when using non-compensated 

overload relays, select heaters from the table using adjusted motor 

currents as follows: decrease rated motor current 1% for each oC 

motor ambient exceeds controller ambient. Increase rated motor 

current 1 % for each oC controller ambient exceeds motor ambient. 

For ambient compensated overload relays no adjustment in heater 

selection is necessary for normal variations in ambient temperatures.

Short Circuit Protection

The relay will provide protection against abnormal load conditions to 

current values exceeding normal locked rotor current; however, to 

protect the relay from short circuit currents, branch circuit protection 

must be provided per the National Electric Code. Protective device 

ratings should not exceed the maximum values listed in the heater 

application table. The relays, as protected are suitable for use on a 

circuit capable of delivering not more than 5000 rms symmetrical 

amperes.

Maintenance

Other than the normal tightening of all wire and heater connections, 

no maintenance should be attempted on the unit. Complete replace-

ment of the unit must be made in the event of damage.

Medium-Voltage applications

The Type A OLR is used with current transformers and the "G" family 

of heaters for coordination with mediumvoltage fuses. Since the 

current transformers have a limited current output under short-circuit 

conditions, no shortcircuit protection is required in their secondary 

circuits supplying current to the Type "G" heaters. Wire the second-

ary circuits of the current transformers with #12 or #14 conductors. 

Divide the motor full-load current by the transformer turns ratio to 

determine the equivalent motor fullload current and select the appro-

priate heater from 

Table 5

 for a service factor 1.15 medium-voltage 

motor.

Table 5.  Type G heaters

Code

Marking

Heater Rating

Equivalent

Full-Load Current

G22

G23

G24

G25

G26 

G27

G28

G29

G30

G31

G32

G33

G34

2.03A

2.23A

2.44A

2.69A

2.95A

3.23A

3.55A

3.90A

4.28A

4.67A

5.10A

5.50A

6.10A

1.63-1.78 Amperes

1.79-1.95 Amperes

1.96-2.15 Amperes

2.16-2.35 Amperes

2.36-2.58 Amperes

2.59-2.83 Amperes

2.84-3.11 Amperes

3.12-3.42 Amperes

3.43-3.73 Amperes

3.74-4.07 Amperes

4.08-4.39 Amperes

4.40-4.87 Amperes

4.88-5.30 Amperes

Table 6.   F series heater selection  

For compensated OLR’s in any size enclosure, and non-compensated OLR’s in 

enclosures with volume not less than 5500 cu. in. Wire with 75

o

C wire.

For use on one pole OLR’s

Code

Marking

Full Load Current of Motor 

(Amperes) (40

o

C Ambient)

Max. Protect.

Device

(Amp)

Load

Wire

Size

FH03

FH04

FH05

FH06

FH07

FH08

FH09

FH10

FH11

FH12

FH13

FH14

FH15

FH16

FH17

FH18

FH19

FH20

FH21

FH22

FH23

FH24

FH25

FH26

FH27

FH28

FH29

FH30

FH31

FH32

FH33

FH34

FH35

FH36

FH37

FH38

FH39

FH40

FH41

FH42

FH43

FH44

FH45

FH46

FH47

FH48

FH49

FH50

FH51

.25 - .27

.28 - .31

.32 - .34

.35 - .38

.39 - .42

.43 - .46

.47 - .50

.51 - .55

.56 - .62

.63 - .68

.69 - .75

.76 - .83

.84 - .91

.92 - 1.00

1.01 - 1.11

1.12 - 1.22

1.23 - 1.34

1.35 - 1.47

1.48 - 1.62

1.63 - 1.78

1.79 - 1.95

1.96 - 2.15

2.16 - 2.35

2.36 - 2.58

2.59 - 2.83

2.84 - 3.11

3.12 - 3.42

3.43 - 3.73

3.74 - 4.07

4.08 - 4.39

4.40 - 4.87

4.88 - 5.3

5.4 - 5.9

6.0 - 6.4

6.5 - 7.1

7.2 - 7.8

7.9 - 8.5

8.6 - 9.4

9.5 - 10.3

10.4 - 11.3

11.4 - 12.4

12.5 - 13.5

13.6 - 14.9

15.0 - 16.3

16.4 - 18.0

18.1 - 19.8

19.9 - 21.7

21.8 - 23.9

24.0 - 26.2

1A

1A

1A

1A

1A

2A

2A

2A

3A

3A

3A

3A

3A

3A

3A

3A

5A

6A

6A

6A

6A

6A

10A

10A

10A

15A

15A

15A

15A

15A

15A

20A

20A

20A

25A

25A

30A

30A

35A

35A

40A

45A

45A

50A

60A

60A

70A

80A

80A

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#14

#12

#12

#12

#10

#10

#10

Above heaters for use on size 1

FH52

FH53

FH54

FHSS

FH56

FH57 

26.3 - 28.7

28.8 - 31.4

31.5 - 34.5

34.6 - 37.9

38.0 - 41.5

41.6 - 45.0

90

100

125

125

125

150

#8

#8

#8

#8

#6

#6

Above heaters for use on size 2

m

WARNING: 

TO PROVIDE CONTINUED PROTECTION AGAINST FIRE AND SHOCK HAZ-

ARD, THE COMPLETE OVERLOAD RELAY MUST BE REPLACED IF BURNOUT 

OF A CURRENT ELEMENT OCCURS. SEE TABLE I.

3

Instruction Leaflet 

IL14568

Effective June 2020

Size 1 or 2 Type A Thermal Overload Relay, 3 Pole, 

Ambient Compensated or Non-Compensated

EATON

 www.eaton.com

Summary of Contents for AA13P

Page 1: ...ction table for the application and all wires must be securely fastened Preferably the OLR should be located in the same ambient as the motor to be protected and in an area free of drafts Heater elements are supplied separately and must be properly selected and securely mounted Three heaters must be used for either single or three phase applications This industrial type control is designed to be i...

Page 2: ...40oF to 167oF Because of a compensating bimetal which maintains a constant travel to trip distance independent of ambient conditions operation of this bimetallic relay is responsive only to heat generated by the motor overcurrent passing through the heater element The compensating feature is fully automatic and no adjustments are required over normal fluctuations in ambient temperatures Overload r...

Page 3: ...ired in their secondary circuits supplying current to the Type G heaters Wire the second ary circuits of the current transformers with 12 or 14 conductors Divide the motor full load current by the transformer turns ratio to determine the equivalent motor fullload current and select the appro priate heater from Table 5 for a service factor 1 15 medium voltage motor Table 5 Type G heaters Code Marki...

Page 4: ...rrent listed for each heater Eaton 1000 Eaton Boulevard Cleveland OH 44122 United States Eaton com 2018 Eaton All Rights Reserved Printed in USA Publication No IL14568 002 June 2020 Eaton is a registered trademark All other trademarks are property of their respective owners Size 1 or 2Type AThermal Overload Relay 3 Pole Ambient Compensated or Non Compensated Instruction Leaflet IL14568 Effective J...

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