Brochure/Catalogue

for EMR for SSR
Bistable relay, impulse relay,
remanence relay
A relay is called bistable if its contacts can assume two different stable switching
states when de-energised. This means that once the contact has changed its
switching position due to the energising parameter (input voltage), it remains in
its switching position after the energising parameter is switched off. A further
energising process is required in order to change the switching position.
Impulse relay:
A bistable relay that remains in an energised state due to mechanical interlock is
called an impulse relay. Impulse relays switch over to the other switching state
during an energising pulse and maintain this state until the next pulse.
Remanence relay: A bistable relay that remains in an energised state due to
remanence after the energising variable is switched off is called a remanence
relay.
To switch over to the other switching state:
•  Apply a voltage to a second coil
•  Apply a voltage with opposite polarity for relays with only one coil
x
Bounce (chatter) An unintended phenomenon that may occur in electromechanical relays, during
the closing or opening of a contact circuit when the contact elements touch and
separate again before they have reached their nal positions.
Solid-state relays do not exhibit this behaviour because they switch electronically,
meaning that no mechanical bouncing can occur.
x
Bounce times The time (average value) between the rst and last closing (or rst and last
opening) of a relay contact. These times are valid when
the rated voltage is used for excitation without any other components connected
in series or in parallel to the coil, and at the reference room temperature
(approx. 23°C).
x
C
CE Abbreviation for Communauté Européenne (the European Community).
Manufacturers use the CE label to conrm that their products comply with the
corresponding EC directives and the “essential requirements“ therein.
x x
EMR = Electromechanical relay
SSR = Solid-state relay
Glossary: Relay modules and Solid-state relays
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Technical appendix/Glossary
W.152737920000