Connecting up
SCALANCE MUM856-1
42
Operating Instructions, 08/2021, C79000-G8976-C628-02
NOTICE
Suitable fuse for the power supply cables (corresponds to "Limited Energy")
The current on the terminal may not exceed 3 A. Use a fuse for the power supply that is
suitable for protection of AC/DC power supply circuits *
)
and protects against currents > 3 A.
•
In areas subject to the NEC or CEC, the fuse must meet the following requirements:
–
Suitable for AC/DC *
)
(min. 60 V / 3 A)
–
Breaking current at least 10 kA
–
Approval according to ANSI/UL 248-14 (suppl. fuses), ANSI/UL 248-4 (Class CC),
ANSI/UL 248-8 (J), ANSI/UL 248-15 (T), or CSA C22.2-4 No. 248.14 (suppl. fuses), No.
248-4 (Class CC), No. 248-8 (J), No. 248-15 (T)
•
In other areas, the fuse must meet the following requirements:
–
Suitable for AC/DC *
)
(min. 60 V / 3 A)
–
Breaking current at least 10 kA
–
Approval according to IEC/EN 60947-1/2/3 or IEC/EN 60898-1/2 for circuit breakers
–
Breaking characteristics: B or C
–
Approval according to IEC/EN 60127-1 for fuses
–
Breaking characteristics: max. 120 s at 2 x I
n
(corresponds to melting integral I
2
t <
4320)
If the properties of the supplying current source are known, the following fuse is also
possible:
•
In areas subject to the NEC or CEC, the fuse must meet the following requirements:
–
Suitable for AC/DC *
)
(min. 60 V / 3 A)
–
Breaking current > highest possible current of the current source (incl. short circuit
current and fault)
–
Approval according to UL 1077 or CSA C22.2 No. 235
•
In other areas, the fuse must meet the following requirements:
–
Suitable for AC/DC *
)
(min. 60 V / 3 A)
–
Breaking current > highest possible current of the current source (incl. short circuit
current and fault)
–
Approval according to IEC/EN 60934
–
Breaking characteristics: max. 120s at 2 x I
n
*
)
AC or DC depending on availability
