Delta Modulon DPH Series User Manual page 9

3. Each protective device could be (1) a breaker, (2) a switch connected in series with
fuses, or (3) a switch*
table below.
20kVA 40kVA
40A
NOTE:
1
* Only applicable when the UPS has the corresponding built-in fuses, and
device's requirement No.7 stated in Page 1-3.
4. Each protective device should have the functions of over current protection, short
circuit protection, insulating protection and shunt trip feature. Please refer to the
20kVA 40kVA
6kA
5. When selecting the protective devices, please take each power cable's current
capacity and the system's overload capacity (please refer to Appendix 1: Technical
Specifications) into consideration. Besides, the short-circuit capacity of the
upstream protective devices must be equal to or larger than the capacity of the
UPS's input protective devices.
6. When the UPS has abnormalities and input short current reaches 8kA, the UPS's
devices' reaction time should be more than 10ms to let the UPS's internal breakers
block breakdown and let the UPS transfer to bypass mode.
7. If the UPS is supplied by a power source whose neutral is grounded, the backfeed
protective device installed as UPS input protection must be a 3-pole type. If the
UPS is supplied by a power source whose neutral is not grounded, the backfeed
protective device installed as UPS input protection must be a 4-pole type.
8. The recommended electrical rating of the backfeed protective device is as follows.
20kVA 40kVA
690V/ 40A 690V/ 75A
1
. For the protective device's rating current, please refer to the
60kVA
75A 125A
60kVA
6kA 10kA
60kVA
690V/ 125A 690V/ 160A 690V/ 200A 690V/ 225A
1-3
1 Important Safety Instructions
80kVA 100kVA
160A 200A
80kVA 100kVA
10kA 10kA
80kVA 100kVA
120kVA
225A
120kVA
10kA
120kVA