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Can a TeSys T overload relay be installed on a type S starter in the field?

Product Line: 
TeSys T Motor Management Controller 

The NEMA type S starters with melting alloy, bimetal, or solid state overloads use a different backplate, as well as different bus, from the starters with TeSys T overloads. 
The backplate and bus are not sold separetly. 
As such the TeSys T cannot be retrofitted to an existing starter, a new starter with TeSys T overload installed from the factory will need to be ordered. 
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