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On the series C 9050JCK70V20, there are two different letters to select for the timing function - what do those different letters mean?

Issue:
On the series C 9050JCK70V20, there are two different letters to select for the timing function - what do those different letters mean? 
Product Line:
General Purpose Plug-In Relay
Environment:
Square D General Purpose Plug-In Relay
Cause:
Clarification is needed before the relay is installed for application.                                                          
Resolution:                                                                 
Letter sets are the same and were incorporated so there would not be voids on the selection dial, would not have to dial through `empty` spots. For example, Letter A or Letter F will set timer for On Delay mode - Letter B or Letter G will set timer for Interval mode, etc.
 
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