Electric Motor Control Basics - Book - Page 12
Industrial Control Basics: Part 1, Contactors
Industrial Control
Basics:
Part 1, Contactors
IEC UTILIZATION CATEGORIES
LOW VOLTAGE UTILIZATION CATEGORIES
NATURE OF
CURRENT
CATEGORY
TYPICAL APPLICATIONS
a.c.
AC-1
AC-2
AC-3
AC-4
AC-5a
AC-5b
AC-6a
AC-6b
AC-7a
AC-7b
AC-8a
AC-8b
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 control.
Switching of incandescent lamps.
Switching of transformers.
Switching of capacitor banks.
Slightly inductive loads in household appliances and similar applications.
Motor-loads for household applications.
Hermetic refrigerant compressor motor control with manual resetting of overload releases.
Hermetic refrigerant compressor motor control with automatic resetting of overload releases.
AC-12
AC-13
AC-14
AC-15
Control of resistive loads and solid-state loads with isolation by optocoupler.
Control of solid-state loads with transformer isolation.
Control of small electromagnetic loads.
Control of a.c. electromagnetic loads.
AC-20
AC-21
AC-22
AC-23
Connecting and disconnecting under no-load conditions.
Switching of resistive loads, including moderate overloads.
Switching of mixed resistive and inductive loads, including moderate overloads.
Switching of motor loads or other highly inductive loads.
A
B
Protection of circuits, with no rated short-time withstand current.
Protection of circuits, with a rated short-time withstand current.
a.c. and
d.c.
RELEVANT
IEC PRODUCT
STANDARD
60947-4
Industrial Control
Basics: Part 2,
Overload Relays
Industrial Control
Basics: Part 3,
Starters
The Benefits of Type E/F
Motor Protection
Circuit Breakers
60947-5
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
60947-3
60947-2
Applying Motor Control
in a Wastewater
Application
NEMA vs IEC Motor
Controls
Understanding
IP Ratings
12
