Specifications

Page 14–14
FOCUS System Manual
Table 14–4. Protective Relay Interface (PRI/PRS) Module Specifications
*Includes a PRI with a flashing LED indicating a redundant/multi-drop mode and one bad channel.
Some users have asked what action should be taken when experiencing different alarm conditions. The
following table is offered as a guide for this purpose.
Interfaces Four independent, bi-directional transfer trip circuits
Input Opto-isolator, 4 mA input current, 48–250Vdc
Output Four trip outputs (PRI = form A contact, PRS = transistor)
One guard output
One block (alarm)
(All outputs rated at 1 Amp)
Channel Speed Back-to-back pickup:
PRI – 7.5ms plus security delay
PRS – 1.0ms plus security delay
Drop out delay:
PRI – 9.0ms
PRS – 2.0ms
Channel Loss Block or force trip for 150 µs
Indicators* Trip TX LED per circuit
Key RX LED per circuit
Block alarm LED
Guard signal LED
Status LED
Connectors Compression-type (20-pos.) terminal block, accepting up to 14
AWG stranded wire (optional)
Screw-type (20-pos.) terminal block, accepting up to 14 AWG
stranded wire (standard) or ring lugs
Keying Specify version with order:
Threshold 48/60V nominal, ≥35 volts (approx.)
110/125V nominal, ≥75 volts (approx.)
220/250V nominal, ≥145 volts (approx.)
*Includes a PRI with a
flashing LED indicating a
redundant/multi-drop mode
and one bad channel.