Specifications

M-PRO Microprocessor
Protection Relays
M-PRO17, M-PRO20, M-PRO30 and M-PRO40 are
the dedicated protection and management units for
the M-PACT air circuit breakers and have been
developed to meet the most stringent demands of
modern circuit protection.
Designed with the full benefit of advanced
microprocessor technology, the M-PRO protection
and management units offer a comprehensive menu
of overload, short circuit and earth fault protection
to satisfy the most enhanced client requirements.
The protection and management system
incorporates the following components:
• Electronic protection relay
• Power current transformers
• Measuring system (Rogowski coil)
The components are separately mounted into the
M-PACT air circuit breaker. Current transformers
power the electronic protection relay and the
measured signal is generated by the Rogowski coils
on the main phases. The M-PRO circuitry senses
TRUE RMS current with immunity to system
disturbances. On request, the M-PRO protection
relay can be permanently powered by an auxiliary
power unit. When the circuit breaker is closed the
current transformers ensure energising power for
the protection unit.
A.8
Technical overview
A
GE Power Controls