NEMA Contactors and Starters - Tri-State Electrical Supply

NEMA Contactors and Starters
Reference Data
33.5
Reference Data
IEC Utilization Categories
(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 reallife
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 behavior.
Used in Technical Data and Formulas
Code Descriptions Code Descriptions
DF Duty factory I rmv Response value of short-time delayed short-circuit release
I Dn Response value of earth-fault release I sd Response value of short-time delayed short-circuit release
I cm Rated short-circuit making capacity I T Response value of earth-fault release
I cn Rated short-circuit breaking capacity I g Response value of earth-fault release
I cs Rated service short-circuit breaking capacity I th Conventional free air thermal current
I cu Rated ultimate short-circuit breaking capacity I the Conventional thermal current of enclosed devices
I cw Rated short-time withstand current I u Rated uninterrupted current
I e Rated operational current S NT Transformer rating
I k Transformer initial short-circuit AC current t r Time delay of overload release response
I L Load monitoring response value t T Time delay of earth-fault release response
I n Rated current t g Time delay of earth-fault release response
I NT Transformer rated current t v Time delay of short-circuit release response
I PK Rated peak withstand current U c Rated actuating voltage
I q Rated conditional short-circuit current U e Rated operational voltage
I r Overcurrent release set value U i Rated insulation voltage
I rm Response value of non-delayed short-circuit release U imp Rated impulse withstand voltage
I i Response value of non-delayed short-circuit release U k Transformer short-circuit voltage
I rmf Response value of fixed, non-delayed short-circuit release U s Rated control voltage
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Control Products Catalog CA08102001E—August 2010 www.eaton.com 115