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- Two Apollo tones
- EN54-3 sounder
- Selectable volumes 55–75dB(A) and 75–91dB(A)
- XP95 (works on Discovery & CoreProtocol)
- XPERT 7 addressing
- 4" isolated base
Frequently bought together

Product details
The Apollo 45681-277APO is an addressable XP95 sounder base with an integral isolator, combining a detector mounting base and an EN54-3 alarm sounder in one unit. It is designed for indoor use.
Key features
- Two Apollo tones
- EN54-3 sounder
- Selectable volumes 55–75dB(A) and 75–91dB(A)
- XP95 (works on Discovery & CoreProtocol)
- XPERT 7 addressing
- 4" isolated base Compatible with / Used for: Apollo XP95 and Discovery detectors on XP95, Discovery or CoreProtocol addressable fire alarm loops. Specification Product code 45681-277APO Brand Apollo Protocol XP95, Discovery and CoreProtocol Sounder standard EN 54-3 Tones Two Apollo tones Volume ranges 55-75 dB(A) and 75-91 dB(A) Isolator Integral short-circuit isolator Supply Loop powered, 17-28V DC Terminals Stainless steel, cables up to 2.5mm2 Diameter 115mm Colour White
Frequently asked questions
Does the 45681-277APO have a built-in isolator?
Yes. It has an integral isolated mounting base (4" isolated base).
What volume settings are available?
Two selectable volume ranges: 55–75dB(A) and 75–91dB(A).
Which detectors fit this sounder base?
It is an XP95 base and works with the Discovery and CoreProtocol protocols, so it suits Apollo XP95 and Discovery detector heads.
Related products: Apollo XP95 detector heads for this base: Apollo 55000-600APO XP95 Optical Smoke Detector, Apollo 55000-400APO XP95 Heat Detector (A2S), Apollo 55000-885APO XP95 Multi-Sensor Detector (Optical/Heat).





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