2
Instruction Booklet
IL70C1080H03
Effective May 2014
Instructions for Field Installing Ground Fault Alarm/Power
Supply Modules into Digitrip 520M Equipped Eaton
Magnum and Magnum DS Circuit Breakers
EATON www.eaton.com
otee:
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The recommendations and information contained herein are based on
experience and judgement, but should not be considered to be all inclusive
or to cover every application or circumstance which may arise. If you have
any questions or need further information or instructions, please contact your
local representative or the Customer Support Center at 1-800-356-1234.
1.0 General Description (of the Ground
Alarm / Power Supply Module)
The Ground Alarm / Power Supply Module (see Figure 1) is an
optional accessory for the Digitrip 520M trip unit. It mounts under-
neath the metal trip unit mounting plate in the Magnum breaker.
When wired (see Figure 2), it will provide an auxiliary power supply
for the Digitrip 520M’s LCD meter display, when the circuit breaker
is lightly loaded. (On non-ground fault style trip units, this will be its
ONLY function.)
A second function of the module is to provide Ground Trip or Ground
Alarm Only contact closure via the relay supplied in the module.
This is assuming the Digitrip 520M is already equipped with ground
trip or ground alarm functionality. The following input voltage ratings
of the module it self are covered: 120 Vac, 230 Vac and 24/48 Vdc.
Figure 1. Ground Alarm / Power Supply Modules
Style #7802C83G01 Shown.
Figure 2. Wiring Diagram for 520M Models and Ground Alarm /
Power Supply Modules.
1.1 Auxiliary Power & Ground Alarm
When the module is wired (as shown in Figure 2), it will provide an
auxiliary power supply so that the 520M/520M
i
liquid crystal dis-
play (LCD) will be functional even when the circuit breaker has no
load. A Digitrip 520M unit
without
auxiliary power will not display
data until load current reaches approximately 25% 1 phase or 10%3
phase of the (
I
n) rating.
A second function of the module is to provide either aground trip or
ground alarm only output contact via the relay supplied in the mod-
ule. On Digitrip 520M models with ground fault protection, an LED
on the front of the unit also provides an indication of ground fault
trip.
1.2 Ground Fault Trip
When the Ground Alarm/Power Supply module is used with the
5MLSIG model, this unit will provide ground fault trip contacts when
the circuit breaker trips on a ground fault. You must then push the
Reset button on the Digitrip in order to reset the contacts (see
Figure 2, Note 3).
1.3 Ground Fault Alarm
A ground fault alarm alerts a User to a ground fault condition with-
out tripping the circuit breaker. (This is applicable when using the
5MLSIA model.) A red Alarm Only LED on the front of the trip unit
will indicate the presence of a ground fault condition that exceeds
the programmed setting.
The ground fault alarm relay is energized when the ground current
continuously exceeds the ground fault pickup setting for a time in
excess of a 0.1 second delay. The alarm relay will reset automati-
cally if the ground current is less than the ground fault pickup (see
Figure 2, Note 4).
