GFD212A ABB distributed control system industrial DCS module card

Description

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Allows remote control opening or closing of the apparatus, depending on the installation position and connection of the releases on the support. The release can, in fact, be used for either
of these two applications. Given the characteristics of the circuit-breaker operating mechanism, opening (with the circuit-breaker closed) is always possible, whereas closing is only
possible when the closing springs are charged. The release can operate with direct current or
alternating current. This release provides instantaneous operation (1), but can be powered permanently (2).
Some installations require very high safety in controlling circuit-breaker opening remotely. In
particular, the control and opening release circuits must be duplicated. To meet these needs,
SACE Emax circuit-breakers can be equipped with a second shunt opening trip unit, fitted with
a special support to hold it, that can house the standard shunt closing and opening releases.
The seat of the second shunt opening release is that of the undervoltage release, which is
therefore incompatible with this type of installation. The special support, including the second
shunt opening release, is installed in place of the standard support.
The technical specifications of the second shunt opening release remain identical to those of
the standard shunt opening release.
When used as a permanently powered closing release, it is necessary to momentarily deenergize the shunt closing release in order to close the circuit-breaker again after opening (the
circuit-breaker operating mechanism has an anti-pumping device).