Effective 9/21/99
Page 2
I.L. 70C1080H01
NOTE: 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 instruc-
tions, 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 Fig. 1.1)
is an optional accessory for the Digitrip 520M trip unit. It
mounts underneath the metallic plate of the trip unit deck
in the Magnum breaker. When wired (per figure 1.2), 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:
120VAC, 230VAC and 24/48VDC.
1.1 Auxiliary Power & Ground Alarm
When the module is wired (as shown in Figure 1.2), it will
provide an auxiliary power supply so that the 520M/520M
i
liquid crystal display (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
(In) rating.
A second function of the module is to provide either a
ground trip or ground alarm only output contact via the
relay supplied in the module. 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 1.2, Note 3).
1.3 Ground Fault Alarm
A ground fault alarm alerts a user to a ground fault
condition without tripping the circuit breaker. (This is
applicable when using the 5MLSIA model.) A red Alarm
2.0 CHOOSING THE PROPER UPGRADE KIT
Choose the Field Installation Kit for Ground Alarm / Power
Supply Module (for Magnum DS circuit breakers equipped
with a Digitrip 520M) in accordance with the voltage input
rating you desire.
120VAC
Style # 70C1081G01
230VAC
Style # 70C1081G02
24/48VDC
Style # 70C1081G03
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 automatically if the ground
current is less than the ground fault pickup (see Fig-
ure 1.2, Note 4).
Fig. 1.2 Wiring Diagram for 520M Models and Ground
Alarm / Power Supply Modules
