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You may also be interested in
High frequency relay, Time delay relay, Solid state relay, Monitoring relay, Relay
Text version of the page
application guide safety relays from riese electronic page 37
Safety circuits with safety relays
Safety circuits with safety relays is a young technology. Before the safety relays were established on the
safety marked all safety circuits had to be realized with conductors.
That means a defined number of conductors were connected together so that safety application were
realized .
Example: electronic conductor circuit
Application only for very simple machines and under restrictions
Main
switch Emergency
stop
Main power
supply End user
Example of a machine control unit with two emergency stop conductors. Allowed to use
only with restrictions
Emergency stop
Start
Today not longer used