Effective 2/2/2001
Page 7
I.L. 70C1037H03
Figure 1.5 Wiring Diagram for 520M Family Models with
Ground Alarm/Power Supply Module
1.7 Display Feature (520M family only)
The Digitrip 520M/520M
i
and 520MC/520MC
i
models have
a user interface in addition to the green and red LED trip
indicators. This seven element display performs a metering
function and can be used to monitor load currents.
When the Step button on the face of the trip unit is
pressed and released, the display will show PH 1, for
Phase 1 or A, and the current value. If the Step button is
not pressed again, the display will continue to show the
current value for Phase 1. Each time that the Step button
is pressed, the next monitored function will be displayed.
The other real time readings can be displayed in the
sequence below:
PH 2
Phase 2 (B)
PH 3
Phase 3 (C)
PH 4
Neutral
PH 5
Ground (if Ground function is supplied)
HI
Highest phase current
OL
Overload (Digitrip in overload mode)
Pushing the Step button while the unit is in the OL
mode will have the unit again display the overload
current value.
HELP This message can indicate more than one problem
with the trip unit. If the rating plug is missing, a
HELP message and an Instantaneous trip LED
light will be observed. The rating plug needs to be
installed and the Instantaneous trip LED must be
cleared by pressing the Reset/Battery Test button.
This message could also indicate that the trip unit
is out of calibration and should be replaced at the
earliest opportunity.
In addition, the Digitrip 520MC product will display and
freeze the magnitude of trip value after a trip event if
auxilary power is available. Use the Step pushbutton to
view each phase value. The highest value that can be
presented is 9999. Any fault currents greater than this
value will be shown as “HI.” Pushing the Reset pushbutton
will clear this data.
Also related to the phase value after a trip event are four
dashes “----”. This message means that the microprocessor
could not complete its writing of the trip event’s magnitude
into its non volatile memory. A possible cause of this would
be the lack or loss of auxilary power during the trip event.
1.8 Standards
The Digitrip 220, 520 520M and 520MC Trip Units are listed
by the Underwriters Laboratories, Inc.
,
under UL File
E52096, for use in Magnum Circuit Breakers. These same
units are also listed by the Canadian Standards Associa-
tion (CSA) under file LR 43556.
All Digitrip units have also passed the IEC 947-2 test
program which includes radiated and conducted emission
testing. As a result, all units carry the CE mark.
2.0 GENERAL DESCRIPTION OF MAGNUM CIRCUIT BREAKERS
2.1 General
Magnum Circuit Breakers are tripped automatically on
overload fault current conditions by the combined action of
three components:
1. The Sensors, which measure the current level
2. The Digitrip Trip Unit, which provides a tripping signal to
the Trip Actuator when current and time delay settings
are exceeded
3. The low-energy Trip Actuator, which actually trips the
circuit breaker
Digitrip 520M/MC
Contact Rating (resistive load)
AC 0.5A @ 230VAC
AC 1A @ 120VAC
DC 1A @ 48VDC
Verify input voltage rating before energizing circuit
When used in conjunction with T.U. Cat. 5MWLSIG,
5MLSIG, 5CWLSIG or 5CLSIG, will indicate GF trip.
When used in conjunction with T.U. Cat. 5MLSIA or
5CLSIA, will indicate GF alarm.
Control Voltage
Remote
Ground
Fault Trip
Ground
Fault Alarm
Ground Alarm / Power Supply Module
G-
A
la
rm
K2
-1
K2
-3
K2
-6
O
u
tput +
O
u
tpu
t -
J3
-1
J3
-2
J3
-3
J4
-4
J4
-3
J4
-1
A-
1
0
A-
11
A1
4
A-
1
5
G-
A
L
M
1
G-
A
L
M
2
AT
R
V
o
lt.
A
T
R CO
M
J4
-2
Available
Input Voltages
120 VAC
7802C83G01
230 VAC
7802C83G02
7802C82G01
Style
Number
24-48 VDC
