Brochure/Catalogue

2 CL protective circuit
2 SL protective circuit
When should I use CL or SL
circuits with surge protection
components for measurement and
control systems?
The difference between the switching
in the CL (current loop) and SL
(symmetrical loop) is the integration of
the suppressor diodes. The CL circuit
has a diode between the lines. This
system is used for current loops and
offers direct protection at the input or
output of the analogue sensor.
The SL circuit operates symmetrically
to earth, i.e. two Transzorb diodes are
connected to earth. If this is used in a
current loop instead of the CL circuit,
the residual voltage is twice as high
because there are two diodes instead
of just the one of the CL circuit.
Questions and answers concerning surge protection
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The basics of lightning and surge protection
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