Electrical ratings and power supply

Supply circuit, power over Ethernet

Power source

Power over Ethernet (PoE) (A50 and A70)

PoE standard

IEEE 802.3af Class 0 (primary), IEEE 802.3 at compatible

Voltage range

44–57 V DC (PoE), 50–57 V DC (PoE+)

Power consumption

8.1 W typical at 48 V PoE (max 8 W at 24/48 V DC external)

Max current (PoE)

≈ 0.17 A at 48 V (0.35 A at 44 V)

Max voltage

60 V DC absolute maximum

Frequency

DC, not applicable

IEEE Power class

Class 0, IEEE 802.3af. Compatible with IEEE 802.3at (PoE+) and IEEE 802.3bt sourcing equipment without additional configuration.

Battery Backup, calculation of 24 hours standby time

Use the table below to size backup batteries. Battery calculations must take into account all devices in the circuit.

Supply type

Voltage

Power

Current draw

24 hour standby (A·h)

24 hour + 5 min Alarm (A·h)

External DC

24 V DC

7.5 W

≈ 0.31 A

≈ 7.44 A·h

≈ 7.47 A·h

External DC

48 V DC

7.5 W

≈ 0.16 A

≈ 3.84 A·h

≈ 3.85 A·h

PoE (IEEE 802.3af)

48 V DC

8.1 W

≈ 0.17 A

≈ 4.08 A·h

≈ 4.09 A·h
Note

NFPA 72 typically carries a 20% safety factor on standby battery calculations.

Compatible PoE power sourcing equipment

Use only PoE power supply equipment that meets the requirements of UL 60950-1 or UL 62368-1 and meets the requirements of UL 2684, section 10.

The power supply equipment chassis must be grounded.

Recommended accessories:

  • PoE-compliant network switches (IEEE 802.3af/at/bt) with grounded chassis.

  • PoE midspan injectors compliant with IEEE 802.3af/at/bt.

  • Gigabit PoE injector 15 W (T199507) (T911676 is included in this accessory).

  • Gigabit PoE injector 16 W (T911183).

Note

Document the manufacturer name and model number of the PoE switch or injector in the system commissioning record.

Supplementary I/O circuits

Alarm/trouble output

Dry-contact relay (solid-state opto relay). Connect to Fire Alarm Control Panel (FACP) IDC.

Alarm output

DIGOUT1A (+) / DIGOUT1B (−), dedicated as alarm output.

Trouble/fault output

FAULT_A (+) / FAULT_B (−), 1× dedicated fault output (NC).

Digital outputs

3× opto-isolated, 0–48 V DC, max 350 mA (derated to 200 mA at 60°C).

Digital inputs

2× opto-isolated, Vin low: 0–1.5 V DC, Vin high: 3–25 V DC.

Min conductor size

26 AWG (0.13 mm²) per UL 2684 §14.4.2b (jacketed, multi conductor cable).

Grounded conductor

White or gray insulation, distinguishable from others.

Circuit type

Power-limited, per NEC Article 725 Class 2.
WARNING

Alarm and trouble signal conductors from the FACP to the detector connector must be a minimum of 18 AWG (0.82 mm2) per NFPA 72 and NEC Article 760. The detector M12 pigtail assembly uses 26 AWG conductors per UL 2684 Sec. 14.4.2(b).

WARNING

For Class A (Style D) wiring, arrange two separate conductors for each alarm signals (DIGOUT1A/1B) and trouble signals (FAULT_A/B), one incoming and one outgoing.