Cut Sheet

V10-T1-6 Volume 10—Enclosed Control CA08100012E—November 2012 www.eaton.com
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1.1
Overview
Enclosed Control Products
IEC Environmental Enclosure Ratings—Examples of Designations
Motor Circuit Elements
Disconnect Switch—
horsepower rated—located in
sight of controller—arranged
for padlocking in open
position—disconnects
motor and controller from
ungrounded power
conductors—position
indicating—readily
accessible—115% carrying
capacity of full load motor
current—interrupting capacity
of stalled motor current—
may serve as disconnect for
more than one motor if
motors are driving parts of a
single machine or motors are
all in a single room within
sight of disconnecting
means, must equal sum of
horsepower ratings to be
disconnected—device may
be general use switch, motor
circuit switch or circuit
breaker meeting code
requirements—disconnecting
means should contain motor
branch-circuit short-circuit
and ground fault protection.
Motor Running Overcurrent
Protection—called overload
relay—protects motor and
control apparatus against
overheating due to motor
overload—does not protect
against short-circuits or
ground faults—selected to
trip at not more than 125%
full load motor current, 40°C
rise motors—115% all other
motors—continuous duty
motor protection—
intermittent duty motors
protected by branch circuit
protection—sufficient time
delay to permit motor to start
and accelerate load without
tripping—sensing devices
(heater coils) in ungrounded
conductor for single-phase—
three sensing devices (heater
coils) required for three-
phase.
Contactor—starting,
stopping motor it controls—
interrupt stalled motor
current—horsepower rated—
not lower than horsepower of
motor controlled—contactor
not in sight of connected
motor must have disconnect
capable of locking in open
position or manually operable
switch that will prevent
contactor closing within sight
of motor—interrupt all
ungrounded power lines—
manually or magnetically
operated.
Controller or Starter—non-
combination contains
contactor and motor running
overcurrent protection in one
enclosure—starts, stops,
protects and regulates motor—
combination starters contain
disconnecting means, branch
short-circuit protection in
same enclosure. (See motor
control sections—three-
phase, single-phase and DC.)
Reduced Voltage—
restrictions in power supply
capacity or machine design
may require reduced voltage
starting—motor connected to
power supply at voltage
lower than supply voltage—
requires use of primary
resistance, reactance or use
of autotransformer—special
motor designs such as part
winding and wye-delta
considered as reduced
voltage starting.
Characteristic letters
first characteristic numeral
(See previous page)
Second characteristic numeral
(See previous page)
IP 4 4
An enclosure with this designation is protected against the penetration
of solid objects greater than 1.0 mm and against splashing water.
An enclosure with this designation is protected against the penetration
of solid objects greater than 12 mm and against splashing water.
Characteristic letters
first characteristic numeral
(See previous page)
Second characteristic numeral
(See previous page)
IP 2 3
Typical Motor Circuit
Safety Switch
Motor Circuit
Switch
Motor
Disconnecting
Means
Motor
Controller
(Contactor)
Motor
Running
Overcurrent
Protection
Motor Branch
Circuit
Overcurrent
Protection
Combination Starter with
Motor Circuit Switch or
Circuit Breaker
Motor
Circuit
Breaker
Motor
Starter