3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
351
Glossary
AC (alternating current)
AC current
ATEX Directive
European Union Directive on explosion protection.
Bistable connection
Connection with two stable states.
Contactor
Electromagnetically actuated switch. Control current flows through a magnetic coil and
activates the switch. While current flows, the ON position is maintained. A contactor has a
higher switching capacity than a relay.
Controller monitoring
Automatically switches a control element in a process sequence when an event has taken
place that interrupts the process sequence.
Current protection
Current limiting switching function that prevents excessive current flow or controls current
flow.
Dahlander connection
Connection in which the motor stator winding is divided into symmetrical winding sections. A
changeover results in changes to the number of poles and thus speed changes in the ratio
1:2.
DC (direct current)
DC current
Delta connection
Connection in which the three phase lines of a three-phase system are connected in series.
The end of a phase line is connected with the start of the next phase line.
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