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    How to review Type 2 coordination charts for classes 20 and 30?


    · When reviewing class 20 & 30 applications, are there any separate Type 2 charts available for the NS80 and NSX100 circuit breakers?

    Answer: No. For Class 20 you take into consideration the note regarding the thermal relay. For class 30 you consider the derating of 20% for the breaker and, if using the F series contactor, check it according to 30 s thermal withstand.

    · If not to the above can it be assumed that you can use the attached charts for class 20 & 30 applications in conjunction with the notes?

    Answer: Yes. For Class 20 you take into consideration the note regarding the thermal relay. For class 30 you consider the derating of 20% for the breaker and, if using the F series contactor, check it according to 30 s thermal withstand.

    · With regards to the notes below the tables, it mentions that the circuit breakers need to be de-rated by 20% for class 30 applications but does that apply to class 20 applications also?

    Answer: No, only class 30.

    · Also, does this 20% de-rating apply to the contactors etc as well?

    Answer: No, only the circuit breaker.

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