Siemens ABHW-4SZ Audible Base P/N:S54320-F14-A2

The Siemens ABHW-4SZ is a supervised audible detector base designed for sleeping areas and other commercial life-safety applications requiring a 520 Hz low-frequency sounder. It combines a compatible Siemens fire detector mounting base with local audible notification, allowing alarm signaling to originate directly at the detector location.

When paired with compatible FD-UL detectors and Siemens fire alarm control panels, the base provides six selectable tone patterns, two volume levels, and synchronized operation across devices connected to the same loop. This product is intended exclusively for commercial fire alarm installations.

**Newer revision of ABHW-4S with enhanced compatibility for current Siemens Desigo/Cerberus systems, including synchronized operation with FD-UL detectors and support for Class A/Class B wiring configurations.

Product Functions

• Provides local audible fire alarm notification
• Generates a 520 Hz low-frequency sound
• Supports sleeping-area notification requirements
• Accepts compatible Siemens fire detectors
• Provides synchronized audible signaling
• Offers selectable tone patterns
• Offers high and low sound-output settings
• Supports remote alarm indicators

Electrical & System Information

The ABHW-4SZ uses the Siemens device loop for supervision and control while receiving alarm power from a compatible regulated external power source or approved notification appliance circuit. Its external operating voltage range is 16–33 VDC.

Maximum supervisory current is 250 µA from the device loop and 1.0 mA from external power. Alarm current varies according to the selected volume level and applied voltage. Full-wave rectified power is not permitted where the installation instructions require regulated 24 VDC auxiliary power.

Features

• Commercial audible detector base
• 520 Hz low-frequency sounder
• Six selectable tone patterns
• High and low volume settings
• Minimum 85 dB high-output level
• Synchronized loop operation
• Automatic recognition of compatible detector types
• Remote alarm lamp support
• Supervised system operation
• Sleeping-area application design
• White housing
• Detector and base combination installation

Mounting & Design

The ABHW-4SZ mounts to a 4-inch square electrical box with a minimum depth of 2.5 inches. A 4-inch octagonal box is not compatible with this model.

The compatible Siemens detector installs directly into the audible base, creating an integrated detector and local sounder assembly.

Protection & Applications

Suitable for:

• Hotels
• Dormitories
• Apartments
• Assisted Living Facilities
• Healthcare Facilities
• Patient Rooms
• Residential Care Buildings
• Sleeping Areas
• Commercial Residential Properties

Compatibility

Compatible with selected Siemens fire alarm control equipment, including:

• FireFinder XLS Systems
• Desigo Fire Safety Systems
• Cerberus PRO Systems
• FC2005 and FC901 Control Panels
• FC2025, FC2050, FV2025, and FV2050 Panels
• FC922, FC924, FV922, and FV924 Panels
• Desigo Fire Safety Modular Systems
• Cerberus PRO Modular Systems

Compatible detectors include selected:

• FDO421
• FDOT421
• FDT421
• FDOOT441
• FDOOTC441
• OOH941
• OOHC941
• OP921
• OH921
• HI921
• HFP-11
• HFPT-11
• HFPO-11
• Canadian S-Series equivalents

Tone selection and available functions vary by detector family and control-panel configuration.

Technical Specifications

Manufacturer: Siemens

Model: ABHW-4SZ

Siemens Part Number: S54320-F14-A2

Product Type: Commercial Audible Detector Base

Sound — High: 85 dB Minimum

Sound — Low: 75 dB Minimum

Selectable Tones: Steady, Temporal 3, Temporal 4, Temporal 4 Low Power, March Time 120, and Canadian March Time 30

Volume Settings: High and Low

External Operating Voltage: 16–33 VDC

Loop Supervisory Current: 250 µA

External Supervisory Current: 1.0 mA

Alarm Current at 24 VDC — High: 90 mA External Power

Alarm Current at 24 VDC — Low: 33 mA External Power

Operating Temperature: 32°F to 120°F (0°C to 49°C)

Operating Humidity: 10%–95% RH, Non-Condensing

Compatible Electrical Box: 4-Inch Square Box, 2.5-Inch Minimum Depth

Housing Color: White

Application: Indoor Commercial Fire Alarm and Sleeping-Area Notification Systems

Applications

The Siemens ABHW-4SZ is designed for commercial fire alarm installations requiring local low-frequency audible notification at the detector location. Typical applications include hotels, dormitories, healthcare facilities, assisted living buildings, apartment properties, residential care occupancies, and other sleeping areas where a compatible Siemens detector and 520 Hz sounder are required in one supervised assembly.

ABHW-4SZ Datasheet