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What's the difference between class 10 class 20 class 30 tripping curves ?

These classes refers to the triping curves, and each class refers to a specific tripping time.
class 10 is for product used in standard application where the tripping time is lessa than 10 sec.
class 20 is for product used in severe applications where the tripping time is less than 20 sec.
class 30 is for product used in more severe applications where the tripping time is lessa than 30 sec.
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