Cutler Hammer, Div of Eaton Corp Overload Relays General Product Line Information
42.4
Motor Protection and Monitoring
Overload Relays
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C440/XT Electronic Overload Relay
Product Description
Eaton’s new electronic
overload relay (EOL) is
the most compact, highfeatured, economical product
in its class. Designed on a
global platform, the new
EOL covers the entire power
control spectrum including
NEMA, IEC and
DP contactors. The NEMA
and DP versions are offered
with the
while the IEC offering has the
XT designation. The
electronic design provides
reliable, accurate and value
driven protection and
communications capabilities
in a single compact device. It
is the flexible choice for any
application requiring easy-touse, reliable protection.
C440 designation
Eaton has a long history of
innovations and product
development in motor control
and protection, including both
traditional NEMA, as well as
IEC control. It was from this
experience that the C440
was developed, delivering
new solutions to meet
today’s demands.
C440 is a self-powered
electronic overload relay
available up to 100A as a
self contained unit. With
external CTs, C440 can
protect motor up to
1500 FLA. Available add-on
accessories include remote
reset capability and
communication modules
with I/O for DeviceNet,
PROFIBUS, and Modbus.
Contents
Description Page
C440/XT Electronic Overload Relay
Standards and Certifications . . . . . . . . . . . . . . . . . . . . . 3
Catalog Number Selection . . . . . . . . . . . . . . . . . . . . . . . 4
Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Technical Data and Specifications . . . . . . . . . . . . . . . . . 13
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Features and Benefits
Features
●
Reliable, accurate, electronic motor protection
●
Easy to select, install and maintain
●
Compact size
●
Flexible, intelligent design
●
Global product offering—available with NEMA, IEC and DP
power control
Size/Range
●
Broad FLA range
(0.33–1500A)
●
Selectable trip class
(10A, 10, 20, 30)
●
Direct mounting to NEMA,
IEC and DP contactors
●
Most compact electronic
overload in its class
Motor Control
●
Two B600 alarm (NO) and
fault (NC) contacts
●
Test/Trip button
Motor Protection
●
Thermal overload
●
Phase loss
●
Selectable (ON/OFF)
phase unbalance
●
Selectable (ON/OFF)
ground fault
User Interface
●
Large FLA selection dial
●
Trip status indicator
●
Operating mode LED
●
DIP switch selectable trip
class, phase unbalance and
ground fault
●
Selectable Auto/Manual
reset
Feature Options
●
Remote reset
●
120 Vac
●
24 Vac
●
24 Vdc
●
Tamper-proof cover
●
Communications modules
●
Modbus RTU RS-485
●
DeviceNet with I/O
●
PROFIBUS with I/O
●
Modbus RTU with I/O
(Q4 2010)
●
Ethernet IP (planned)
●
Smartwire (planned)
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2 Control Products Catalog CA08102001E—July 2010 www.eaton.com
Motor Protection and Monitoring
Overload Relays
42.4
Benefits
Reliability and Improved Uptime
●
C440 provides the users
with peace of mind
knowing that their
assets are protected
with the highest level
of motor protection and
communication capability
in its class
●
Extends the life of plant
assets with selectable
motor protection features
such as trip class, phase
unbalance and ground fault
●
Protects against
unnecessary downtime
by discovering changes
in your system (line/load)
with remote monitoring
capabilities
●
Status LED provides
added assurance that
valuable assets are
protected by indicating the
overload operational status
Flexibility
●
Available with NEMA,
IEC and DP contactors
●
Improves return on
investment by reducing
inventory carrying costs
with wide FLA adjustment
(5:1) and selectable
trip class
●
Patented design
incorporates built-in ground
fault protection thus
eliminating the need for
separate CTs and modules
●
Flexible communication
with optional I/O enables
easy integration into plant
management systems for
remote monitoring and
control
●
Available as an open
component and in
enclosed control and
motor control center
assemblies
Monitoring Capabilities
●
Individual phase
currents RMS
●
Average three-phase
current RMS
●
Thermal memory
●
Fault indication (overload,
phase loss, phase
unbalance, ground fault)
Safety
●
IP 20 rated terminal blocks
●
Available in Eaton’s
industry leading FlashGard
MCCs
●
Tested to the highest
industry standards such
as UL, CSA, CE and IEC
●
RoHS compliant
Standards and
Certifications
●
UL
●
CSA
●
CE
●
NEMA
●
IEC/EN 60947 VDE 0660
●
ISO 13849-1 (EN954-1)
●
RoHS
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ATEX directive 94/9/EC
●
Equipment Group 2,
Category 2
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Electronic Overload Education
Description Definition Cause Effect if not Protected C440/XT Protection
Motor Protection
Thermal overload Overload is a condition in which
Ground fault A line to ground fault. A current leakage path to ground. An undetected ground fault can burn
Unbalanced phases
(voltage and current)
Phase loss—current
(single-phasing)
current draw exceeds 115% of
the full load amperage rating for
an inductive motor.
Uneven voltage or current
between phases in a three-phase
system.
One of the three-phase voltages is
not present.
• An increase in the load or torque that is
being driven by the motor.
• A low voltage supply to the motor
causes the current to go high to
maintain the power needed.
• A poor power factor causing above
normal current draw.
When a three-phase load is powered with
a poor quality line, the voltage per phase
may be unbalanced.
Multiple causes, loose wire, improper
wiring, grounded phase, open fuse, etc.
• Increase in current draw leads to heat
and insulation breakdown, which can
cause system failure.
• Increase in current can increase
power consumption and waste
valuable energy.
through multiple insulation windings,
ultimately leading to motor failure, not to
mention risk to equipment or personnel
Unbalanced voltage causes large
unbalanced currents and as a result this
can lead to motor stator windings being
overloaded, causing excessive heating,
reduced motor efficiency and reduced
insulation life.
Single-phasing can lead to unwanted
motor vibrations in addition to the results
of unbalanced phases as listed above.
• Thermal trip behavior is defined by
UL, CSA and IEC standards.
• Trip class is settable from 10A,
10, 20, 30
Fixed protective setting that takes the
starter offline if ground fault current
exceeds 50% of the FLA dial setting,
i.e., if the FLA dial is set to 12A, the
overload relay will trip if the ground
current exceeds 6A.
Fixed protective setting that takes the
starter offline if a phase drops below
50% of the other two phases.
Fixed protective setting that takes the
starter offline if a phase drops below
50% of the other two phases.
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Control Products Catalog CA08102001E—July 2010 www.eaton.com 3
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