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Connecting - Siemens SIMATIC CC712 Operating Instructions Manual

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Suitable fusing for the power supply cable
The current at the connecting terminals must not exceed 4 A. Use a fuse for the power
supply that protects against currents > 4 A.
The fuse has to be designed for protection of DC power supply circuits as well as for the
following requirements.
• In areas used according to NEC or CEC:
• In other areas:
You do not need a fuse for the power supply cable if you use a voltage source according
NEC Class 2 or a power supply from the range of accessories, see attachment Power
supply (Page 109).
Protective ground
A PELV circuit contains a connection to protective ground. Without a connection to protective
ground, or in case there is a fault in the connection to the protective ground, the voltage for
the circuit is not stabilized.
Power supply
The device is designed for operation with a directly connectable safety extra-low voltage
(SELV) and protective extra-low voltage (PELV) according to IEC 60364-4-41.
Recommendation: Use the power supply of a process station if this is in the vicinity of the
Operating Instructions, 05/2019, C79000-G8976-C503-01
– Suitable for DC (min. 60 V / max. 4 A)
– Cut-off voltage min. 10 kA
– UL/CSA listet (UL 248-1 / CSA 22.2 No. 248.1)
– Classes R, J, L, T or CC
– Suitable for DC (min. 60 V / max. 4 A)
– Cut-off voltage min. 10 kA
– Approved for power supply circuits (branch circuits) according to local regulations
(e.g. IEC 60127-1, EN 60947-1)
– Breaking characteristics: B or C circuit breakers and fuses
Installation, wiring, commissioning
3.3 Connecting


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