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What is meant by tripping class for thermal overload relays ?

The tripping class is the tripping performance for thermal overload relay (relation between current to trip on Vs Time),
The avilable tripping classes for thermal overload relays of Schneider Tesys offer are:

- Class 10
- Class 20

(difference between the two classes is in the tripping time where Class 10 can withstand up to 7.2 In for 10 Seconds while Class 20 can withstand same 7.2 In but up to 20 seconds) 
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