Cut Sheet

V8-T7-42 Volume 8—Sensing Solutions CA08100010E—July 2015 www.eaton.com
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For Customer Service in the U.S. call 1-877-ETN CARE (386-2273),
in Canada call 1-800-268-3578.
For Application Assistance in the U.S. and Canada
call 1-800-426-9184.
7.11
Current and Voltage Sensors
CurrentWatch EGFL Series
EGFL Series CurrentWatch Current Sensors
Contents
Description Page
EGFL Series CurrentWatch Current Sensors
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-43
Standards and Certifications . . . . . . . . . . . . . . V8-T7-38
Product Selection . . . . . . . . . . . . . . . . . . . . . . . V8-T7-43
Technical Data and Specifications . . . . . . . . . . V8-T7-43
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . V8-T7-44
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-44
EGFL Series CurrentWatch Current Sensors
Product Description
The CurrentWatch EGFL
Series from Eaton’s Electrical
Sector is a family of ground
fault (earth leakage) sensors.
Ground fault sensors help
protect people, products and
processes from damage by
ground fault conditions by
monitoring all current-carrying
conductors in grounded
single- and three-phase delta
or wye systems. For more
information, see “Zero
Sequence” Operating
Principle on this page. The
EGFL Series is available with
either solid-state or
mechanical relay outputs.
The EGFL Series with
mechanical relays are
available in solid-core
housings with a choice of NO
or NC SPST latching relays
and a SPDT Form C relay with
auto-reset. All mechanical
models can be ordered with a
fixed setpoint or with a “tri-
set” option, which provides
three factory-set, field
adjustable setpoints.
Application Description
Typical Applications
●
Personnel Protection
(Typically 5 mA)—Detects
sensitive ground fault
conditions, which could
cause injury to people, and
functions as a sensor and
alarm trigger when part of
an overall ground fault
protection system
●
Equipment Protection
(Typically 10 or 30 mA)—
For applications where
personnel protection is not
the primary concern,
higher setpoint capability
helps eliminate nuisance
tripping while still providing
adequate ground fault
detection to protect
machine electronics
●
Regulatory—Meets
requirements as stipulated
by governmental and
industrial regulatory groups
for ground fault sensing
For the most current information
on this product, visit our Web site:
www.eaton.com
Example Application—Insulation Breakdown Monitoring
”Zero Sequence” Operating Principle
In three-phase delta and wye
systems, under normal
conditions, current in the
“hot” leg of a two-wire load
is equal in magnitude but
opposite in sign to the current
in a neutral leg. As a result,
the electromagnetic fields
surrounding these two
conductors cancel, producing
a “zero sum current.” As
soon as current leaks to
ground (fault condition), the
two currents become
imbalanced and a net
magnetic field results. The
CurrentWatch EGFL Series
sensors monitor this field and
trip alarm contacts when the
leakage rises above the
setpoint.
Ground Fault Sensor
Circuit Interruption Device
Shunt Trip Breaker
For example, Contactor
Leakage
to Ground