Accessories and Spare Parts
Instruction handbook
b maXX
BM5500, BM5600, BM5700
Document No.: 5.13008.10
267
11
Device protection
Use semiconductor fuses with the tripping characteristic aR (DVDE 0636-201 / DIN EN
60269-2-1 / HD 630.2.1 54). Connect these in series with the cable protection fuses. In
the event of a short-circuit, these protect the line-side rectifier unit circuit on the input side
against complete destruction, in order that it is possible to repair the device.
Dimension suitable device protection fuses depending on peak current and the maximum
load integral i
2
t
off
.
1)
Use fuses that fall below the specified cutoff integral (i
2
t
aus
)
in the operating point
.
Cable prot
device protection
There are two alternatives for protecting cable and devices:
m
Connecting cable protection fuses and semiconductor fuses in series
m
Using full-range fuses with the tripping characteristic gR and gS (DVDE 0636-201 / DIN
EN 60269-2-1 / HD 630.2.1 54).
Dimension the suitable cable and devices protection fuses based on the cross-section of
the power supply cable used, the peak current and the maximum load integral i
2
t
off
.
In contrast to safety fuses, the device and cables may also be fused with the listed circuit
breakers according to UL (DIVQ).
Only circuit breakers without trip delay are approved. Circuit breakers with only a thermal
tripping characteristic are not tested and thus not approved. A particular point to consider
is that, in case of an error, the device is not protected against destruction; instead, only
the system is protected against the risk of fire.
The suitability of circuit breakers depends on the cross-section of the power supply cable
used and the dimensioning of the rated and peak current of the devices.
Device
Maximum load integral
1)
BM55
1X
310 A
2
s
BM55
22
400 A
2
s
BM55
23
450 A
2
s
BM55
24
BM55
25
BM55
26
BM55
27
800 A
2
s
BM55
3X
BM56
3X
9 500 A
2
s
BM55
4X
BM56
4X
b
15.000 A
2
s
BM55
5X
BM56
5X
BM57
5X
97.000 A
2
s
BM55
6X
BM56
6X
BM57
6X
245.000 A
2
s
BM55
7X
BM57
7X
1.125.000 A
2
s