Rockwell Automation Low-Voltage Switchgear and Controlgear - Manual (Page 13)

Nature of
current Category Typical applications Relevant
IEC product
standard
a.c. AC-40
AC-41
AC-42
AC-43
AC-44
AC-45a
AC-45b
Distribution circuits comprising mixed resistive and
reactive loads having a resultant inductive reactance
Non-inductive or slightly inductive loads, resistance
furnaces
Slip-ring motors; starting, switching off
Squirrel-cage motors: starting, switching off motors
during running
Squirrel-cage motors: starting, plugging1), inching2)
Switching of electric discharge lamp controls
Switching of incandescent lamps
60947-6-2
AC-7a
AC-7b
Slightly inductive loads for household appliances and
similar applications
Motor-loads for household applications 61095
a.c. and d.c. A
B Protection of circuits, with no rated short-time withstand
current
Protection of circuits, with a rated short-time withstand
current
60947-2
DC-20A, DC-20B
DC-21A, DC21B
DC-22A, DC22B
DC-23A, DC23B
3)
Connecting and disconnecting under no-load conditions
Switching of resistive loads, including moderate
overloads
Switching of mixed resistive and inductive loads,
including moderate overloads (e.g. shunt motors)
Switching of highly inductive loads (e.g. series motors)
60947-3
d.c. DC-1
DC-3
DC-5
DC-6
Non-inductive or slightly inductive loads, resistance
furnaces
Shunt-motors, starting, plugging1), inching2). Dynamic
breaking of motors
Series-motors, starting, plugging1), inching2). Dynamic
breaking of motors
Switching of incandescent lamps
60947-4-1
DC-12
DC-13
DC-14
Control of resistive loads and solid-state loads with
isolation by optocouplers
Control of electromagnets
Control of electromagnetic loads having economy
resistors in circuit
60947-5-1
DC-12
DC-13
Control of resistive loads and solid state loads with
optical isolation
Control of electromagnets
60947-5-2
DC-31
DC-33
DC-36
Resistive loads
Motor loads or mixed loads including motors
Incandescent lamp loads
60947-6-1
DC-40
DC-41
DC43
DC-45
DC-46
Distribution circuits comprising mixed resistive and
reactive loads having a resultant inductive reactance
Non-inductive or slightly inductive loads, resistance
furnaces
Shunt-motors: starting, plugging1), inching2). Dynamic
breaking of d.c. motors
Series-motors: starting, plugging1), inching2). Dynamic
breaking of d.c. motors
Switching of incandescent lamps
60947-6-2
1) By plugging is understood stopping or reversing the motor rapidly by reversing motor primary connections
while the motor is running.
2) By inching (jogging) is understood energizing a motor once or repeatedly for short periods to obtain small
movements of the driven mechanism.
3) The utilization categories with annex A apply for frequent operations, those with annex B for infre-
quent/occasional operations
Tab. 1.1-1
Examples of utilization categories for low-voltage switchgear as per IEC 60947-1 ed. 5.0 Appendix A.
Copyright © 2007 IEC, Geneva, Switzerland. www.iec.ch
LVSAM-WP001A-EN-P - April 2009 1-3