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  • Kidde | Intelligent 520 Hz Low Frequency Audible Sounder Base for CO and Fire Detectors - TC3/TC4 Separation with FX-T3T4 Tone Generator | KI-ABLT

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Kidde | Intelligent 520 Hz Low Frequency Audible Sounder Base for CO and Fire Detectors - TC3/TC4 Separation with FX-T3T4 Tone Generator | KI-ABLT

Kidde | Intelligent 520 Hz Low Frequency Audible Sounder Base for CO and Fire Detectors - TC3/TC4 Separation with FX-T3T4 Tone Generator | KI-ABLT

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SKU:
KD-KI-ABLT

The KI-ABLT puts 520 Hz low frequency notification on Kidde Intelligent detector circuits - the frequency NFPA 72 requires for sleeping-room applications. It replaces a standard base under any compatible Kidde V-PCOS or Signature/GSA series detector, adding code-compliant audible notification without a separate horn or speaker run.

Built for fire and CO notification compliance

The 520 Hz output meets the low frequency sounder requirement for sleeping areas where standard 3 kHz sounders don't cut it. The base supports TC3 (temporal three) for fire and TC4 (temporal four) for CO when paired with the FX-T3T4 tone generator module - giving you distinct, code-compliant tone patterns for fire and carbon monoxide from the same device. Two volume settings (high and low) let you tune output to room size. UL listed and CSFM approved.

Key features

  • 520 Hz ±10% output: meets NFPA 72 low frequency requirement for sleeping-room notification
  • TC3/TC4 tone separation: distinct temporal patterns for fire and CO when paired with FX-T3T4 tone generator
  • Drop-in replacement: installs on standard 4 in. square or 3-1/2 in. octagonal boxes - same wiring, same mounting
  • Two volume settings: high (87 dBA) and low (83 dBA) nominal output at 10 ft for flexibility across room sizes
  • Wide detector compatibility: works with Kidde V-PCOS and Signature/GSA intelligent detector families
  • Indoor rated: 32 to 120°F operating range, 0-93% RH noncondensing

System requirements

Requires a compatible Kidde intelligent fire alarm control panel and SLC loop. For TC3/TC4 tone separation (distinct fire vs. CO patterns), add the FX-T3T4 tone generator module. Without the tone generator, the base defaults to steady or TC3 fire tone only. Accepts 12-18 AWG wiring on screw terminals. Mounts on 4 in. square (2-1/8 in. deep), 3-1/2 in. octagonal (2-1/8 in. deep), or AB4G-SB surface box.

Brand:
Kidde Commercial
Form factor:
Low frequency audible sounder base
Resonant frequency:
520 Hz Ā±10%
Sound output (nominal):
83 dBA (low) / 87 dBA (high) at 10 ft anechoic
Sound output (UL reverberant, TC3 fire):
76.3 dBA (low) / 80.8 dBA (high)
Sound output (UL reverberant, TC4 CO):
73.0 dBA (low) / 77.4 dBA (high)
Sound output (UL reverberant, Steady):
80.9 dBA (low) / 85.3 dBA (high)
Tone modes:
TC3 (fire), TC4 (CO), Steady - FX-T3T4 required for TC3/TC4 separation
Operating voltage:
16 to 33 VDC (SLC loop powered)
Supervisory current:
6.0 mA DC
Alarm current:
75.2 to 150.8 mA (varies by tone pattern, volume, and voltage)
Wire size:
12 to 18 AWG (0.75 to 2.50 mmĀ²)
Wire terminals:
Screw terminals
Compatible electrical boxes:
4 in. square (2-1/8 in. deep), 3-1/2 in. octagonal (2-1/8 in. deep), AB4G-SB surface box, European 100 mmĀ² box
Base diameter:
6.8 in. (173 mm)
Base height:
1.4 in. (35 mm) from box
Compatible detectors:
Kidde V-PCOS and Signature/GSA intelligent series
Environment:
Indoor only
Operating temp:
32 to 120Ā°F (0 to 49Ā°C)
Operating humidity:
0 to 93% noncondensing
Agency listings:
UL, CSFM
Compliance:
NFPA 72 low frequency sleeping-room requirement
Does the KI-ABLT need the FX-T3T4 tone generator?
FX-T3T4 is required for TC3/TC4 tone separation (distinct fire vs. CO patterns). Without it, the base runs steady or TC3 fire tone only. Add FX-T3T4 if the job needs separate CO notification tones per code.
What detectors are compatible with this sounder base?
The KI-ABLT works with Kidde V-PCOS intelligent detectors and Signature/GSA series intelligent detectors. It replaces the standard detector base - the detector head plugs directly into the sounder base.
Why does NFPA 72 require a 520 Hz sounder in sleeping rooms?
Standard 3 kHz sounders don't reliably wake sleeping occupants. NFPA 72 requires 520 Hz (Ā±10%) low frequency output in sleeping areas. The KI-ABLT meets this at the detector - no separate notification appliance run needed.
What are the volume levels and can I adjust them?
Two settings: nominal anechoic output at 10 ft is 83 dBA (low) and 87 dBA (high). UL reverberant ratings vary by tone - TC3 fire: 76.3/80.8 dBA, TC4 CO: 73.0/77.4 dBA, Steady: 80.9/85.3 dBA. Volume is configurable at the base.
What wire size does the KI-ABLT accept?
The sounder base accepts 12 to 18 AWG (0.75 to 2.50 mmĀ²) on screw terminals. Standard SLC wiring applies.
What electrical boxes does this mount on?
Standard 4 in. square by 2-1/8 in. deep, 3-1/2 in. octagonal by 2-1/8 in. deep, standard European 100 mmĀ² box, or the AB4G-SB surface mount box accessory.
What's the difference between the low frequency and standard sounder base?
KI-AB (standard) outputs ~3 kHz. KI-ABLT outputs 520 Hz per NFPA 72 sleeping-room requirements. Use standard for general notification, low frequency wherever sleeping areas fall in the notification zone.

Spec Sheet

Download File

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