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Can you use the same relays for fixed and withdrawable breakers and will the fault/arc flash times be the same?

Yes, you can use the same relay as long as it fits within the means of the low voltage box of the switchgear. Fixed switchgear will traditionally have a smaller low voltage box that could restrict the size of your relay, but not the capability of the relay. For example, a 751-amp arc flash relay can be used in either fixed or withdrawable switchgear. 
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