Dc Input Circuit Breaker; Line To Line Units Suggested Dc Circuit Breaker Ratings - MGE UPS Systems 3.5 to 21 kVA N+1 Owner's Manual

3.5 to 21 kVA N+1 Inverter
2.8.3

DC Input Circuit Breaker

Due to tremendous amounts of short circuit current available (in excess of 1000A for as long as several minutes!)
from bank(s) of batteries, that supply electrical power to inverter systems, it is extremely important to connect a
properly sized DC circuit breaker at the DC input cable that feeds the inverter system. The following table is pro-
vided as a guide for selecting the proper circuit breaker.
Table 2-4: Line To Line Units Suggested DC Circuit Breaker Ratings.
Inverter rating
CB rating
Figure 2-6: Inverter Receiver Junction Box, Input and Output Wiring.
GND
L2-IN
L2-OUT
TB1
L1-OUT
L1-IN
INVERTER RECEIVER
WITH JUNCTION BOX
page 2 — 12
JUNCTION
BATTERY
BATTERY
BACK VIEW
Installation & Operation - Line To Line
7 kVA 14 kVA
200A 400A
BOX
(-)
(+)
INVERTER RECEIVER
WITH JUNCTION BOX
21 kVA
600A
SIDE VIEW