Brochure/Catalogue

Glossary: Relay modules and Solid-state relays
Glossary: Relay modules and Solid-state relays
for EMR for SSR
A
AC switching capacity
(resistive), max.
Calculated product for resistive loads from switching current and switching voltage
in VA.
When switching inductive loads, it is recommended to reduce the switching
capacity in order to achieve the longest possible service life.
The reduction results from the arc, which is signicantly stronger when switching
inductive loads than when switching resistive loads.
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Approvals and testing marks The test marks are a way for independent (ofcial or private) approval bodies and
testing institutions to conrm compliance with the respective regulations and/or
compliance with specied product properties.
Note: If any approval-relative technical data is missing from the data sheet, it is
available on request.
Approvals that we offer for Weidmüller relay modules and solid-state relays,
depending on the variant:
CSA Canadian Standards Association, Canada
DNV-GL Classication society made up of testing bodies Det Norske Veritas and
Germanischer Lloyd, Norway
EAC Eurasian Conformity for the Eurasian Economic Union, Russia
TÜV Technischer Überwachungs-Verein [German Technical Inspectorate],
Germany
cURus Component Recognition Mark from UL (Underwriters Laboratories, Inc.)
for the USA and Canada
cULus Component Listing Mark from UL (Underwriters Laboratories, Inc.) for
the USA and Canada
VDE VDE Testing and Certication Institute, Germany (expert reports with
production monitoring)
x x
B
B10 and B10d The B10 value indicates the nominal service life at which 90% of the tested
relays are still working.
This is therefore the average number of switching cycles after which 10% of the
relays fail.
This value is a statistically expected value, which has been determined on the
basis of endurance tests.
In real applications, the service life values differ from the B10 value, because
every load is different and the service life is affected by environmental parameters
such as temperature, mounting position and also the switching frequency.
This value is only suitable for purely theoretical failure probability calculations
(see item entitled “MTTF”) and is not a guaranteed service life.
As the values are heavily dependent on the load and the environmental
parameters, we do not specify these values in the data sheet for standard relays,
and only provide them on request.
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EMR = Electromechanical relay
SSR = Solid-state relay
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Technical appendix/Glossary
W.14 2737920000