Siemens Simatic RTU303xC Series Operating Instructions Manual page 53

If you use battery modules at the same time as an external voltage source, the RTU
switches from battery operation to the external voltage supply as soon as there is an
adequate voltage at X10 IN.
● X10 CTRL
X10 CTRL can be configured using the WBM as a 12/24 V control output to control an
external router or to supply sensors and switches of actuators connected to the RTU.
The voltage value for X10 and X11 (12 or 24 V) can be configured.
RTU303xC
Operating Instructions, 06/2019, C79000-G8976-C382-06
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 *
3 A.
• In areas subject to the NEC or CEC, the fuse must meet the following requirements:
– Suitable for AC/DC *
– Tripping 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 *
– Tripping current at least 10 kA
– Approval according to IEC/EN 60947-1/2/3 or IEC/EN 60898-1/2 for circuit
breakers
– Tripping characteristics: B or C
– Approval according to IEC/EN 60127-1 for fuses
– Tripping characteristics: max. 120 s at 2 x I
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 *
– Tripping 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 *
– Tripping current > highest possible current of the current source (incl. short-circuit
current and fault)
– Approval according to IEC/EN 60934
– Tripping characteristics: max. 120s at 2 x I
* AC or DC depending on availability
)
(min. 60 V / 3 A)
)
(min. 60 V / 3 A)
)
n
(min. 60 V / 3 A)
)
(min. 60 V / 3 A)
)
n
LEDs, connectors, buttons, card slots
2.3 Interfaces and connectors
and protects against currents >
)
(corresponds to melting integral I t <
2
53