Glossary
Selectivity for 3VA molded case circuit breakers
78 Configuration Manual, 08/2016, A5E03603181010-01
Response current, short-time delay
When this current limit is exceeded, the circuit breaker trips after a predefined time delay.
S release
Electronic short-time delay over-current release for delayed short-circuit protection
Short-circuit
Accidental or intentional conductive path between two or more conductive parts forcing the
electric potential differences between these conductive parts to be equal to or close to zero
as defined by IEC / DIN EN 60947-1, 2.1.5
Short-circuit current
Over-current resulting from a short-circuit due to a fault or an incorrect connection in an
electric circuit as defined by IEC / DIN EN 60947-1, 2.1.6
Trip unit
Unit connected to the switching device (circuit breaker) which operates the breaker's
mechanical release system and so opens the breaker when certain specified variables
(e.g. current, voltage) are exceeded.
Tripping current of overload release
The current value at which a release trips within a certain time.
Tripping current, instantaneous
When this current limit is exceeded, the circuit breaker trips instantaneously.
Tripping current, overload
When this uninterrupted current limit is exceeded within a predefined time period, the circuit
breaker trips (inverse-time delay tripping!).
Tripping time
Period of time from the instant of commencement of trip command output to the moment at
which the command becomes irrevocable (timing concept for the tripping of circuit breakers).
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