Automatic Pitot Heat

No there is not any problem I am interested to understand thoroughly the wiring design, absolutely you are right about the schematic , but I believe any relay should consists of a set of input terminals for control signals that is more likely the oil pressure signal from EAU, and a set of operating contact terminals corresponding to controlled currents that here it is more likely 115acv power supply for pitot heat, so 28vdc power supply for relay is a bit odd?!!

From your last email..... I already know the answer.

Your WDM, IPC, and Equipment List show the power contactors as "breakers".

This is a naming issue. Circuit breakers as commonly referred to are.....
  
     
  
Contactors (called breakers in print) are power bus connection devices.
  
     
  
You're getting caught up in nominclatures. Boeing calls them one thing, Airbus another.....Gulfstream another, etc....

They're all the same thing.

Gulfstream....
  
  

Given, contactor item606 as per the part catalogue is applicable to an specific tail number however it is not including in the WDM equipment list, Is air carrier permitted to install it on that tail number?

The IPC overrides the Equipment List. The equipment list is more of a quick lookup for parts. It might not be updated as frequently as the IPC.