Eaton XT-40 User Manual download pdf (Page 77)

75PG03407001U – June 2006 Technical details

Technical details

(See also IEC/EN 60947-1; 2.1.18/IEV 441-17-19)

A combination of specified requirements relating to the condition in which the switching device or fuse fulfills its purpose and

selected to represent a characteristic group of real-life applications. The specified requirements may, for example, relate to

the values of making and breaking capacity and other characteristic values, data concerning associated circuits and the

applicable conditions of use and operational behaviour.

IEC Utilisation Categories used in Technical Data and Formulas

Code Descriptions Code Descriptions

DF Duty factory I

rmv

Response value of short-time delayed short-circuit release

∆n

Response value of earth-fault release I

Response value of short-time delayed short-circuit release

Rated short-circuit making capacity I

Response value of earth-fault release

Rated short-circuit breaking capacity I

Response value of earth-fault release

Rated service short-circuit breaking capacity I

Conventional free air thermal current

Rated ultimate short-circuit breaking capacity I

the

Conventional thermal current of enclosed devices

Rated short-time withstand current I

Rated uninterrupted current

Rated operational current S

Transformer rating

Transformer initial short-circuit AC current t

Time delay of overload release response

Load monitoring response value t

Time delay of earth-fault release response

Rated current t

Time delay of earth-fault release response

Transformer rated current t

Time delay of short-circuit release response

Rated peak withstand current U

Rated actuating voltage

Rated conditional short-circuit current U

Rated operational voltage

Overcurrent release set value U

Rated insulation voltage

Response value of non-delayed short-circuit release U

imp

Rated impulse withstand voltage

Response value of non-delayed short-circuit release U

Transformer short-circuit voltage

rmf

Response value of fixed, non-delayed short-circuit release U

Rated control voltage

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Eaton XT-40 User Manual Page 77

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