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Does X80 discrete IO modules have short circuit protection in-built.

Built-in protection is available for X80 discrete IO modules. However use fast blow fuse on output field terminal of appropriate rating. Below are the built in protections available in X80 DO modules:

against over voltage =  Yes, by Transil diode  
against inversions =  Yes, by inverted diode  
against short-circuits and overloads =  Yes, by current limiter and electric circuit-breaker 1.5 In < Id < 2 In  
 
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