With its new Safeseries safety relays,
Weidmüller offers a module
designed to shut down process
industry plant and components
in an emergency. The G3 coated
version is a requirement
for applications where
there is a high concentration of
hydrogen sulphide and it has
been tested in accordance with
EN 60068-2-60. TUV NORD
has certified that the Safeseries safety
relay range fulfils SIL3 requirements
in accordance with EN 61508.
Relays have a safety and optional
monitoring circuit. Three relays are
connected in series in the safety
circuit to guarantee safe
isolation of the output
circuit at all times. The
typical break time is 14ms
and the make time 7ms. A
special circuit arrangement
in the input circuit ensures
the module is immune to test
pulses. A 5A fuse guarantees
short circuit protection in the
SIL circuit. Ease of accessibility aids
replacement on site.