Ultron DPS Series
92
• The protective device is optional, and its type must be fast-acting DC circuit breaker and/
or fast-acting DC fuse. If you want to buy any of them, please contact Delta service
personnel. When choosing the protective device, follow the instructions below.
(1) The protective device’s rated current must comply with the current values shown in
Table 5-4
.
(2) The specifications of the protective device’s short-circuit protection (i.e. the tripping
current of the fast-acting DC circuit breaker and/ or the melting current of the fast-
acting DC fuse) must be 4 ~ 6 times the values shown in
Table 5-4
. Besides, the
response time of the protective device must be less than 20ms.
(3) For the choice of the fast-acting DC fuse mentioned above, the A50QS series from
the supplier
Ferraz Shawmut
is suggested. Please contact Delta customer service
for relevant information.
(4) The maximum tripping current of the fast-acting DC circuit breaker and/ or the
maximum melting current of the fast-acting DC fuse mentioned above are 6 times as
much as the values shown in
Table 5-4
. These maximum values are suggested for
general applications only. For the actual maximum values, the maximum short-circuit
capacity of the on-site batteries must be taken into consideration. Please contact
Delta customer service for relevant information.
External Battery Cabinet’s Protective Device (Option 1)
(Figure 5-48: Installation of a 4-pole DC Isolated Switch in Series with DC Fuses)
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