Siemens FH901-R3 — red system enclosure for the Cerberus PRO 50-point addressable fire alarm control panel, Siemens part number S54433-B103-A4.
A Model FC901 panel is built from three pieces: the FCM901-U3 main board, the FP2011-U1 170-watt power supply and this enclosure. The FH901 backbox supports all system modules and uses a dual-mounting setup — the main board hangs temporarily in a lower position so the technician has room to land field wiring, then moves up for standard mounting before power is applied. The trailing R is the red finish; FH901-U3 is the same enclosure in black.
- For the Model FC901 Cerberus PRO 50-point addressable FACP
- Supports batteries up to 12 AH; Siemens directs larger sets to a UL Listed battery box
- Optional FHA901-U1 battery bracket secures batteries up to 12 AH and is required for seismic certification to ASCE / SEI 7-05
- Flush mounting uses trim kit FHA902-R1 (red) or FHA902-U1 (black)
This is the enclosure alone: the FCM901-U3 main board and FP2011-U1 power supply are separate part numbers. Do not confuse it with FSD901-R3, the red remote system display, or FHA902-R1, the red flush trim kit.
