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DESCRIPTION
The PR512 relays are devices using digital
microprocessor-based technology to obtain data
processing regarding the protection.
The PR512 are used as switchboard protection
units and provide protection of the installations,
combined with ABB medium voltage HD4 series
circuit-breakers.
Special features
PR512/P (50-51-50N-51N)
4
Trip precision
Wide setting range
Operation ensured even with the primary circuit
with single-phase power supply
No limitation of the rated breaking capacity and
short-time withstand current of the circuit-
breaker even for the lowest rated currents of the
relay
Single and simultaneous adjustment of the three
phases
Constancy of characteristics and operating
reliability
Processing of the RMS value to express the true
energy content of the current.
provides the protection functions
against overload (51), instantane-
ous or delayed short-circuit (50),
earth fault (51) and instantaneous
of delayed earth fault (50N)
displays the phase current with the
highest load.
PR512/P (50-51)
provides the protection functions
against overload (51), instantane-
ous or delayed short-circuit (50)
displays the phase current with the
highest load.
PR512/PD (50-51-50N-51N +
dialogue)
provides the protection functions
against overload (51), instantane-
ous or delayed short-circuit (50),
earth fault (51) and instantaneous
of delayed earth fault (50N)
displays the phase current with the
highest load
has the dialogue function and
allows connection to the electrical
installation management system.
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