Alpha Technologies AMPS80 HP - Manual (Page 27)

25 Doc. #: 026-069-B0 Rev F
3.4 DC Fuse/Breaker
Alpha recommends using fuses instead of breakers because they provide better fault protection.
The recommendations in Table G are for reference only. A registered professional engineer
must review and approve or modify these recommendations in compliance with applicable
national and local electrical and building codes.
NOTE:
Table G — Recommended DC fuse/breaker
Model
AMPS
80-3-75
AMPS
80-3-75-H2
AMPS
80-3-30
AMPS
80-3-30-H2
AMPS
80-2-40
AMPS
80-2-40-H2
AMPS
80-2-20
AMPS
80-2-20-H2
DC
input
Maximum DC Input wattage 67 kW 27 kW 36 kW 18 kW
Maximum DC Input Current
@ 48 Vdc, full load
1396 A 563 A 750 A 375 A
DC input current @ 40 V
110% load
1843 A 743 A 990 A 495 A
Maximum DC input breaker 2500 A, maximum 50 kA SCC
Recommended
minimum DC fuse/
breaker rating
(100% rated, per
feed)
Single DC
feed
2000 A 800 A 1000 A 500 A
Dual DC
feed
1200 A 400 A 500 A 250 A
Quad DC
feed
600 A 200 A 250 A 125 A