Westinghouse CO User Manual




 



     

      

      

       
   

 

  
 

     
  
        
   


   

  
    






 

    
        
 

  
󰁛 


      
        
    
         



 

    
       
     
       
       
    
     
      
     




   󰁛  
 

    


    
  
         
       
       
     

  
 
      



   

   


󰨖



   
 
     
  
       
 
 

 
 

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  
        

     





 
 
 
      
         
  
        
      
   
        
 
      
        





 

   
 
     
       

    
    
      
   
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      

       
       
        
 
         



 
    
  



 
      
www . ElectricalPartManuals . com

Westinghouse CO Specifications

General

Type	Electromechanical Relay
Application	General Purpose
Operating Temperature	-40°C to +70°C
Mechanical Life	10, 000, 000 operations
Contact Rating	10A @ 250VAC
Coil Voltage	120VAC
Electrical Life	100, 000 operations

Summary

INSTRUCTIONS

APPLICATION

Details the use of induction-overcurrent relays for disconnecting circuits when current exceeds a given value.

Overcurrent Element

Explains the induction-disc type element that operates on overcurrent.

Contactor Switch

Describes the d-c. contactor switch, a solenoid type switch used within the relay.

CIRCUIT-OPENING RELAY

Overcurrent Element

Details the overcurrent construction and operation for circuit-opening relays.

De-ion Contactor Switch

Explains the a-c. solenoid switch used to short-circuit trip coils in circuit-opening relays.

Operation Indicator

Describes the indicator for circuit-opening relays, wired in series with the breaker trip coil.

CHARACTERISTICS

RELAYS IN TYPE FT CASE

Details the FT case, an enclosure combining relay elements and test switches for compact assembly.

CONTACT CIRCUIT CONSTANTS

Lists resistance values for universal trip circuits and circuits with instantaneous trip.

Testing

Testing In Service

Procedures for testing the relay while it is connected in the circuit.

Testing Out of Case

Methods for testing the relay elements after removing the chassis from its case.

Testing In Case

Steps for testing the relay with the chassis installed in its case.

INSTALLATION

INSTALLATION

Guidelines for mounting and installing the relays on switchboard panels.

SETTINGS

SETTINGS

Information on setting the current and time values for relay operation.

ADJUSTMENTS AND MAINTENANCE

Overcurrent Element (Circuit Closing Relays)

Adjustment procedures for the overcurrent element in circuit-closing relays.

Contactor Switch (Circuit-Closing Relays)

Adjustment guidelines for the contactor switch in circuit-closing relays.

Operation Indicator (Circuit-Closing Relays)

How to adjust the operation indicator for circuit-closing relays.

Instantaneous Trip Attachment

Details on adjusting the instantaneous trip element's pick-up current.

Instantaneous Lock-out Attachment

Instructions for adjusting the instantaneous lock-out attachment.

RENEWAL PARTS

RENEWAL PARTS

Information on obtaining and ordering replacement parts for the relays.

ENERGY REQUIREMENTS

Definite Minimum Time CO Relays at 60 Cycles

Table detailing V.A., current, power factor, and ratings for definite minimum time CO relays.

Inverse Time CO Relays at 60 Cycles

Table detailing V.A., current, power factor, and ratings for inverse time CO relays.

Very Inverse Time CO Relays at 60 Cycles

Table detailing V.A., current, power factor, and ratings for very inverse time CO relays.

Long Time CO Relays at 60 Cycles

Table detailing V.A., current, power factor, and ratings for long time CO relays.

Short Time COH Relays at 60 Cycles

Table detailing V.A., current, power factor, and ratings for short time COH relays.

Burdens at Tap Current on 25 and 50 Cycles

Table showing V.A. and power factor for different relay types at 25 and 50 cycles.