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Interface description – Siemens Terminal TC35 User Manual

Page 15

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Interface description

Polarity reversal protection
Polarity reversal protection is implemented
by means of a power diode. The diode has a
reverse voltage of 400V.

Overvoltage protection
Overvoltages are suppressed by a Zener
diode after the polarity reversal protection
diode.

Fuses
A permanently installed, non-replaceable
fuse in the TC35 Terminal ensures electrical
safety in the event of faults. Connect a fast
1.25A fuse to the supply line of the positive
supply voltage for general protection of the
Terminal, see "Safety and installation
information" on page9.