Owner's manual

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

AMPS80-3-75

AMPS80-3-75-H2

AMPS80-3-30

AMPS80-3-30-H2

AMPS80-2-40

AMPS80-2-40-H2

AMPS80-2-20

AMPS80-2-20-H2

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