Introduction
The CurrentWatch™ EGF Series 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 mechanical outputs are
available in solid-core housings with a choice of N.O. or N.C. SPST
latching relays. All mechanical models can be ordered with a fixed
setpoint or with a “tri-set” option, which provides three factory-set,
field adjustable setpoints.
Note:
N
This manual only covers EGF Series models listed in the above table.
This installation manual does not cover EGF Series models with auto-reset.
Quick Install Guide
The below steps can be followed to quickly install a CurrentWatch
EGF Series switch.
1. Run all current carrying conductors through sensor window,
using an auxiliary current transformer if conductors do not fit.
2. Mount the sensor to a surface if needed.
3. Connect output and power wiring:
a. Use up to 14 AWG copper wires,
b. Ensure power and load matches those shown on the sensor
label.
4. Test the unit:
a. Pressing the “TEST” button will test the sensor’s internal
circuits,
b. CAUTION: The output and any c
onnected loads will switch
during the test process.
Installation and Mounting
Considerations for all EGF Series sensors…
•
Run wire to be monitored through the aperture (opening) in the
switch body, making sure all wires are oriented so that current
flows in the same direction (see “Principal of Operation” section
below.
•
These sensors can be located in the same environment as
motors, contactors, heaters, pull-boxes and other electrical enclo-
sures.
•
Mounting can be done in any position or hung directly on a wire
with a wire tie.
•
Be sure to leave at least 1.0 in. (25.4 mm) distance between sen-
sor and other magnetic devices.
Considerations for wiring EGF Series sensors…
•
Use up to 10 AWG copper wire and tighten terminals to 4.5 in.-lbs
/ 0.51 N·m maximum torque.
•
Connect power wiring to terminals 1 and 2, making sure that the
power supply matches the power rating on the sensor label.
•
Connect output wiring to terminals 3 and 4.
Principal of Operation
Under normal conditions, the current in one wire of a two wire load
is equal in strength but opposite in sign to the current in other wire.
The two wires create magnetic fields that cancel, a condition known
as “Zero Sum Current.” If any current leaks to ground (Ground Fault),
the two currents become unbalances and there is a net resulting
magnetic field. The EGF Series sensor detects this minute field and
change the output state. This concept extends to three phase sys-
tems such as 3-wire Delta and to 4-wire Wye.
Single Phase
(Phase to
Neutral or Phase
to Phase)
Three-Phase
Delta
(Includes Neutral
if Load Uses
Neutral)
Three-Phase
Wye
(Include Neutral
if Load Uses
Neutral)
Three-Phase
Load
(Using Auxiliary
CT)
WIRING
Use up to 14 AWG copper wire and tighten terminals to 4.5 in.-lbs /
0.51 N·m maximum torque. See diagram below.
PNwtr
Connect power wiring to Terminals 1 and 2. Be sure that the power
supply matches the power rating on the sensor label.
Ouopuo
Connect output wiring to Terminals 3 and 4.
Rtsto Swioch
Connect a momentary dry contact to the Reset Terminals 5 and 6.
Limit wire run to 200 ft. (60.96 m) of 18 AWG or larger wire.
MNmtnoary Rtsto
Only close the reset terminals momentarily—the sensor will not
work properly if the reset terminals are closed (shorted) continu-
ously. Limit wire run to 200 ft. (60.96 m) of 18 AWG or larger wire.
Paralltl Rtsto CNnntcoiNn
Multiple sensors may be connected to the same reset switch in
parallel. Only the sensors that have detected a fault and have latched
will be reset. A sensor will not reset unless the fault has dropped
below setpoint.
Operation
The EGF Series latching ground fault sensors operating in one of two
states: Reset or Latched. If control power is removed, the sensor
remains in it’s last state (latched or reset).
Rtsto
The sensor has not detected a fault and the output is in the “nor-
mal” position. For Normally Open (N.O.) sensors, the contact is
normally open in the reset condition. For Normally Closed (N.C.) sen-
sors, the contact is normally closed in the reset position.
Laochtd
Upon detecting a fault or when the TEST switch is pressed, the out-
put will switch and “latch.” The output will remain latched until the
ground fault is removed and the output is reset by a momentary dry
contact on Terminals 5 and 6.
Red Status LED (On When Tripped)
Setpoint Adjustment
(Located Under Label)
Test Button
(Caution: Will Activate Output Relay)
External Reset Button (5 and 6)
Output (3 and 4)
Power Supply Input (1 and 2)
Power (Green) LED
(On if Power is Applied)
1
2
3
4
5
6
G
R
TEST
2
EATON
www.eaton.com
CurrentWatch™ EGF Series Ground Fault Sensors
120 VAC or 24 VAC/DC, N.O. or N.C. SPST
Latching Relay Output
Instructions Publication
P51923
Effective July 2017
