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Manual Or Automatic Reset

The overload relay is normally furnished set for “HAND” reset opera-

tion. The relay may be set for either “HAND” or “AUTO” slightly 

loosening the reset screw (1), holding the reset plate (2), moving the 

plate to the proper position marked on the molded case (away from 

the panel for”Hand” reset and toward the panel for”Auto” reset) and 

retightening the screw. 

(See Figure 1.)

Automatic reset should not be used with 2-wire control circuits 

where automatic starting of the motor may be hazardous.

Adjustable Trip

The trip rating of a specific heater element can be adjusted over 

a range of approximately 85% to 115%. This is accomplished by 

turning the adjustment knob (3) on the top of the relay to the respec-

tive stop position. This to alleviate nuisance tripping; or conversely, to 

gain closer protection when desired.

Trip Indication

The Type A overload relay gives an immediate visible indication of 

trip. When an overload occurs, which causes the relay to operate, a 

trip indicator (5) projects out through a small opening at the bottom 

of the relay. 

(See Figure 1.)

Ambient Compensation

Ambient compensated OLR’s have substantially the same trip 

characteristics for ambient temperatures from -40oC to 75oC (-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 

relays having ambient compensation can be identified by light gray 

reset rods whereas non-compensated overload relays have red reset 

rods.

Figure 2. Size 2 overload relay for A200 controller mounting

Figure 3. Overload relay mounted on A200 controller

m

IMPORTANT

DO NOT TAMPER WITH THIS TRIP INDICATOR AS IT IS AN INTEGRAL PART 

IN THE CALIBRATION AND TAMPERING THEREWITH MAY CAUSES CHANG-

ES IN TRIP CHARACTERISTICS.

Table 2.  Control contact ratings

AC

volts 

Normally closed

Normally open

Make

Break

Make

Break

24-120

120-600

20A

2400 VA

2A

240 VA

5A

600 VA

0.5A

60 VA

Table 3.  Power circuit terminals

NEMA Size

Wire Size

1

2

#14 - 8 AWG

#14 - 3 AWG

Wire with copper conductors only

Table 4.  Recommended driving torque

Location (Qty.)

Driving

Torque

(lb.-in.)

Main Power Connections (6)

Control Connections (2)

Heater Mtg. Screws (2/pole)

18 - 20 (Size 1)

45 - 50 (Size 2)

8 - 9

18 - 20

2

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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