The AT-F321 Automatic Extinguisher Control Panel combines a conventional fire alarm control panel and gaseous extinguishing control panel in one compact, metal enclosure. It provides four detection zones, each of which can participate in the decision to release the extinguishing agent.
The panel supports staged alarm operation (first- and second-stage), supervised NAC (sounder/bell) circuits and extinguishant release outputs with programmable time delay up to 75 seconds in 5-second steps. Voltage-free changeover relays are provided for Fire, Local Fire, Fault, First Stage, Second Stage and Extract, allowing easy integration with external equipment such as extract fans, external indicators and building management systems.
Designed in accordance with EN54-2 (Control and Indicating Equipment), EN54-4 (Power Supply Equipment) and EN12094-1 (Electrical automatic control and delay devices for gas extinguishing systems), the AT-F321 includes a wide-range mains power supply (90–270 VAC, 50/60 Hz) and integrated charger for two 12 V sealed lead-acid batteries up to 7 Ah for standby operation.
With supervised detection, monitored inputs and sounder circuits using end-of-line resistors, plus a two-wire RS-485 bus for up to 32 status or ancillary units, the AT-F321 is an excellent choice for small and medium-sized gas extinguishing and clean agent systems.
4 conventional detection zones – each zone can contribute to extinguishant release decision
Designed according to EN54-2, EN54-4 and EN12094-1
Adjustable extinguishant release delay time: 0–75 s in 5-second steps
Voltage-free changeover relays: Fire, Local Fire, Fault, First Stage, Second Stage, Extract
Integrated 90–270 VAC mains power supply and battery charger (2 × 12 V, up to 7 Ah)
Supervised detection, monitored input, NAC and extinguishant circuits with EOL resistors
RS-485 connection for status units / ancillary boards (up to 32 units)
Compact IP30 metal enclosure, Class A indoor use, suitable for control rooms and equipment rooms
Environmental class: Class A (indoor use only)
Operating temperature: −5°C (±3°C) to +40°C (±2°C)
Relative humidity: max. 95% RH, non-condensing
Enclosure rating: IP30
Dimensions (W × H × D): 383 × 295 × 87 mm
Weight: Approx. 5 kg
Mains supply: 90–270 VAC, 50/60 Hz
Mains fuse: 3 A (F3AL250V)
Power supply rating: 3 A total (incl. battery charging)
Battery type: 2 × 12 V sealed lead-acid in series, up to 7 Ah
Battery charge voltage: 27.6 VDC nominal (28 V ± 2 V), charge current ≤ 0.7 A
Maximum current draw from batteries: 3 A (mains failure)
Number of detection circuits: 4 (21–28 VDC)
Detectors per zone: ≤ 30 conventional detectors
Zone quiescent current: ≤ 4 mA per zone
Number of sounder circuits: 4 (21–28 VDC)
NAC outputs: 26–28 VDC, electronic fuse 500 mA, 1.2 A total over all NACs
Extinguishant release output: 21–28 VDC, max load 2 A
Extinguishant release delay: 0–75 s, adjustable in 5 s steps
Relay contact rating (Fault / Fire / 1st / 2nd / Extract / Local Fire): 2 A @ 30 VDC, changeover
EOL resistors:
Detection & monitored inputs: 4.7 kΩ ±5%, ½ W (range 3–5.6 kΩ)
Sounder & extinguishant circuits: 10 kΩ ±5%, ½ W (range 6.8–20 kΩ)
Detector alarm threshold: 270 Ω – 1 kΩ
Call point alarm threshold: 150 Ω – 1 kΩ
Short circuit threshold: 0 – 130 Ω
SIL / AL / FLT / RST inputs: switched input, min 0 Ω, max 1 kΩ
Status / ancillary connection: two-wire RS-485, up to 32 units
Clean agent and gas extinguishing systems (FM-200, NOVEC 1230, inert gas, CO₂, etc.)
Server rooms, data centres and IT facilities
Power distribution rooms, control rooms and substations
Industrial plants and process equipment rooms
Telecom facilities, archive rooms and high-value asset protection
