Cut Sheet

Volume 8—Sensing Solutions CA08100010E—July 2015 www.eaton.com V8-T7-37
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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.
7.10
Current and Voltage Sensors
CurrentWatch EGF Series
EGF Series CurrentWatch Current Sensors
Contents
Description Page
EGF Series CurrentWatch Current Sensors
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-38
Standards and Certifications . . . . . . . . . . . . . . V8-T7-38
Product Selection . . . . . . . . . . . . . . . . . . . . . . . V8-T7-38
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-39
Technical Data and Specifications . . . . . . . . . . V8-T7-40
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-41
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-41
EGF Series CurrentWatch Current Sensors
Product Description
The CurrentWatch EGF
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.
The EGF Series with solid-
state outputs offers the
benefit of reliable, long-
lasting solid-state switches.
Solid-state design provides
unlimited switch operating
life, superior resistance to
shock and vibration, zero off-
state leakage, high switch
speeds and high input-output
isolation.
The EGF Series with
mechanical relay outputs
is available in solid-core
housings with a choice of
NO or NC SPST latching relays
and a SPDT Form C relay with
auto-reset.
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 applied
as an input to 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 EGF Series
sensors monitor this field and
trip the contacts when the
leakage rises above the
setpoint.
Ground Fault Sensor
Circuit Interruption Device
Shunt Trip Breaker
For example, Contactor
Leakage
to Ground