086318-002 ABB Controller module motor card inventory

Description

A circuit-breaker must control and protect, in case of faults or malfunctioning,
the connected elements of a plant. In order to perform this function, after
detection of an anomalous condition, the release intervenes in a definite time
by opening the interrupting part.
The protection releases fitted with ABB SACE moulded-case and air circuitbreakers can control and protect any plant, from the simplest ones to those
with particular requirements, thanks to their wide setting possibilities of both
thresholds and tripping times.
Among the devices sensitive to overcurrents, the following can be considered:
• thermomagnetic releases and magnetic only releases;
• microprocessor-based releases;
• residual current devices.
The choice and adjusting of protection releases are based both on the requirements of the part of plant to be protected, as well as on the coordination
with other devices; in general, discriminating factors for the selection are the
required threshold, time and curve characteristic.