24V Isolated Failsafe Monitoring Unit

Order code: BF391 Category:
  • Allows I/O devices that may not be compatible with the PSU failure requirements of BS 7273-4 Cat A to comply.
  • Is supplied on a single gang plate with an onboard isolating End of Line Unit (EOL) and normally energised 24V 3A rated relay.
  • Provides failsafe operation per BS 7273-4 Cat A, B & C requirements for all compatible I/O units.
  • Provides failsafe operation per BS 7273-4 Cat A B & C requirements for multiple coincidental loop failures (sometimes required in a specification above and beyond the requirements of BS 7273-4) for all compatible I/O units.
  • Accommodates I/O units sited inside or outside the 24V Aux enclosure (I/O units sited remotely require a BF390 EOL unit to maintain the failsafe function).
  • Provides complete galvanic isolation between the fire alarm system and the door release system.
  • Provides (where allowed) failsafe manual door release monitoring to BS 7273-4 Cat A utilising a single T&E cable for multiple manual operating points such as free swing doors.
  • Click here for Wiring Diagrams & Tech Specs.
  • Ask for a copy of our Engineering Note on BS 7273-4 detailing what the standard does and does not require.