Technical data

June 2005
178
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XT IEC Power Control
Reference Data
IEC Utilization Categories
(See also IEC/EN 60947-1;
2.1.18/IEV 441-17-19)
A combination of specified require-
ments 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 val-
ues, data concerning associated cir-
cuits and the applicable conditions
of use and operational behavior.
Table 232. Used in Technical Data & Formulas
Annex A (informative)
Table 233. Examples of Utilization Categories for Low-Voltage Switchgear and Controlgear


60947-1 © IEC: 2004.

By plugging is understood stopping or reversing the motor rapidly by reversing motor primary connections while the motor is running.

By inching (jogging) is understood energizing a motor once or repeatedly for short periods to obtain small movements of the driven mechanism.
Code Descriptions
DF Duty factory
I
∆n
Response value of earth-fault release
I
cm
Rated short-circuit making capacity
I
cn
Rated short-circuit breaking capacity
I
cs
Rated service short-circuit breaking
capacity
I
cu
Rated ultimate short-circuit breaking
capacity
I
cw
Rated short-time withstand current
I
e
Rated operational current
I
k
Transformer initial short-circuit AC cur-
rent
I
L
Load monitoring response value
I
n
Rated current
I
NT
Transformer rated current
I
PK
Rated peak withstand current
I
q
Rated conditional short-circuit current
I
r
Overcurrent release set value
I
rm
Response value of non-delayed short-
circuit release
I
i
Response value of non-delayed short-
circuit release
I
rmf
Response value of fixed, non-delayed
short-circuit release
Code Descriptions
I
rmv
Response value of short-time delayed
short-circuit release
I
sd
Response value of short-time delayed
short-circuit release
I
T
Response value of earth-fault release
I
g
Response value of earth-fault release
I
th
Conventional free air thermal current
I
the
Conventional thermal current of
enclosed devices
I
u
Rated uninterrupted current
S
NT
Transformer rating
t
r
Time delay of overload release
response
t
T
Time delay of earth-fault release
response
t
g
Time delay of earth-fault release
response
t
v
Time delay of short-circuit release
response
U
c
Rated actuating voltage
U
e
Rated operational voltage
U
i
Rated insulation voltage
U
imp
Rated impulse withstand voltage
U
k
Transformer short-circuit voltage
U
s
Rated control voltage
Category Typical Applications Relevant IEC Product Standard
Nature of Current — AC
AC-1 Non-inductive or slightly inductive loads, resistance furnaces 60947-4-1
AC-2 Slip-ring motors: starting, switching off 60947-4-1
AC-3 Squirrel-cage motors: starting, switching off motors during running 60947-4-1
AC-4 Squirrel-cage motors: starting, plugging

, inching

60947-4-1
AC-5a Switching of electric discharge lamp controls 60947-4-1
AC-5b Switching of incandescent lamps 60947-4-1
AC-6a Switching of transformers 60947-4-1
AC-6b Switching of capacitor banks 60947-4-1
AC-7a Slightly inductive loads for household appliances and similar applications 61095
AC-7b Motor-loads for household applications 61095
AC-8a Hermetic refrigerant compressor motor control with manual resetting of overload releases 60947-4-1
AC-8b Hermetic refrigerant compressor motor control with automatic resetting of overload releases 60947-4-1
AC-12 Control of resistive loads and solid-state loads with isolation by optocouplers 60947-5-1
AC-12 Control of resistive loads and solid-state loads with optical isolation 60947-5-2
AC-13 Control of solid-state loads with transformer isolation 60947-5-1
AC-14 Control of small electromagnetic loads 60947-5-1
AC-15 Control of AC electromagnetic loads 60947-5-1
AC-20 Connecting and disconnecting under no-load conditions 60947-3
AC-21 Switching of resistive loads, including moderate overloads 60947-3
AC-22 Switching of mixed resistive and inductive loads, including moderate overloads 60947-3
AC-23 Switching of motor loads or other highly inductive loads 60947-3