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Magnum VS –48 Vdc User’s Manual Page 10
3.7. Load Protection Installation
Circuit Breaker Installation
Standard circuit breaker output boards are available with two 30-A breakers or one 60-A
breaker. Output boards are installed at the factory and are generally not field replaceable units.
Contact APC if the output configuration is not suitable for your needs. Other breaker sizes are
not readily available.
GMT Fuse Installation
Fuse holders that accommodate GMT fuses are located on the front panel on the left side of the
unit. Insert the fuse in the holder; observing the tripped indicator is correctly oriented. Use the
chart shown in Figure 3.7-1 to help determine what size fuses will carry the desired current.
When using several of the larger GMT fuses in one shelf, better heat dissipation will be
achieved if the fuses are spaced out evenly within the output panel. A list of GMT type fuses
available from APC is provided in Figure 3.7-3.
AMBIENT TEMPERATURE
20° C 50° C 60° C
7.5 A 5 A 4.5 A 4 A
10 A 7 A 6 A 5 A
FUSE
SIZE
15 A 10 A 9 A 8 A
Figure 3.7-1 GMT Fuse Temperature De-rating Chart
GMT Fuses
FUSE RATING PART NUMBER FUSE RATING PART NUMBER
¼ A FFA-0030 3 A FFA-0036
½ A FFA-0031 5 A FFA-0037
3/4 A FFA-0032 7½ A FFA-0029
1 A FFA-0033 10 A FFA-0038
1¼ A FFA-0039 15 A FFA-0040
1½ A FFA-0035
Figure 3.7-3 GMT fuses available from APC