Toshiba GR-200 Series Instruction Manual page 280

6F2T0200 (0.15)
Three-phase trip circuit (TRC)
The trip circuit (TRC) scheme will issue a trip command to the circuit breaker (CB) when it
receives trip signals from the protection functions (which are identified with 'FC18', 'FC19', etc.
to represent OC, EF relay, etc.). The TRC function can also receive an alternate trip signal
generated by an additional relay external to the IED using PLC connection points via the
binary IO module (BIO)†. If the additional relay can provide a check-signal to condition
tripping, increased reliability can be achieved within the IED when using the check-signal as
an input to the TRC logic (i.e., fail-safe operation is realized by the operation of the additional
relay).
GRE200 (1,2)
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