CurrentWatch™ Current Sensors
EGF Series Ground Fault Sensors
1
August 2007
CA05311002E
EGF Series Ground Fault Sensors
CurrentWatch Current Sensors
Ground Fault Sensors with Solid-State or Mechanical Relay
Outputs
Bright LED Status Indicators
Choice of Solid-State
Contents
or Mechanical Relays
Overview . . . . . . . . . . . . . . . . . . . . 1
Model Selection, Switches . . . . . . 2
Model Selection, Accessories . . . 3
Wiring Diagrams . . . . . . . . . . . . . . 5
Specifications . . . . . . . . . . . . . . . . 6
Dimensions . . . . . . . . . . . . . . . . . . 7
The CurrentWatch EGF Series from
Eaton’s electrical business 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 is available with
either solid-state or mechanical relay
outputs.
Built-In Mounting Tabs
Product Features
■ Broad Range of Options to Meet Application Needs — N.O. or N.C., solid-
state or mechanical relays, normally energized or normally de-energized
contacts
■ Setpoint Options Maximize Ease-of-Use and Application Flexibility — Field
selectable 5, 10 or 30 mA setpoints on the EGF “Tri-set” models make user
adjustments fast, sure and convenient
■ Compatible with Standard Equipment — Application on single- and three-
phases systems, ideal for use with shunt trip breakers, and magnetically
isolated from monitored circuit and control power
The EGF Series with solid-state out-
puts offers the benefit of reliable,
long-lasting solid-state switches.
Solid-state design provides unlim-
ited switch operating life, superior
resistance to shock and vibration,
zero off-state leakage, high switch
speeds and high input-output isola-
tion. Solid-state outputs have solid-
core housings with screw terminals.
■ Agency Approved — UL and CE Certified, accepted worldwide
The EGF Series with mechanical
relay outputs are available in solid-
core housings with a choice of N.O. or
N.C. 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.
Typical Applications
■ Personnel Protection (Typically 5 mA) — Detects sensitive ground fault con-
ditions, 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
Approvals
■ UL Recognized
”Zero Sum” 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 trips the contacts when the leakage rises above the setpoint.
Unless otherwise noted, the
products contained in this
document are not designed
or intended for use in human
safety applications.
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.
CA05311002E
For more information visit: www.eaton.com
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