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Bussmann ?
Telpower ? Fused Disconnect Switch
DC Distribution/Protection System
TP15900-4
Proper sizing of the current limiting resistor, referred to
as R ALARM in the diagram below, is essential to prevent
excessive current, which could cause damage to the
LED in the disconnect head, from passing through the
remote alarm circuit. Because the LED is in series with
the remote alarm circuit, the maximum available alarm
circuit current should be limited to no more than 30 mA.
This is the maximum sustained current that can be toler-
ated by the LED. It is important to note that when calcu-
lating the size of the resistor, the number of circuits in
By calculating the minimum value of R ALARM as
described above, the maximum available remote alarm
circuit current will not exceed 30 mA. In the event of
multiple fuse blows, where the fuses are connected in
parallel on the same remote alarm bus, the total avail-
able remote alarm circuit current will be evenly divided
between each of the LED’s. For example, if three fuses
blow, each LED, indicating the presence of a blown fuse,
will conduct approximately 10 mA each, assuming the
total available remote alarm circuit current is 30mA.
parallel on the remote alarm circuit is irrelevant. The
resistor value should always be calculated assuming that
the total available alarm circuit current is conducted
through a single LED. This will insure that the 30 mA
limitation is not exceeded. The calculations required to
determine both the resistance and the wattage rating of
R ALARM are shown below .
METHOD FOR CALCULATING THE MINIMUM SERIES RESISTANCE VALUE NECESSARY TO LIMIT THE AVAIL-
ABLE ALARM CIRCUIT CURRENT TO ≤ 30mA. THE MINIMUM RESISTOR WATTAGE CALCULATIONS IS ALSO
SHOWN.
V SYSTEM
R ALARM =
I LED
(where I LED - 30 mA max.)
P RALARM = (V SYSTEM )(I LED ) (where I LED - 30 mA max).
Form No. TP15900-4
12-1-99
Page 3 of 3
SB99155
Rev. A
BIF Doc #5001
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