Description

The Siemens U-MHST is a commercial electronic horn designed for indoor fire alarm notification systems. Operating from 20 to 31 VDC, it provides high output audible notification with synchronization and silenceable operation for modern commercial fire alarm installations.

The horn features field selectable temporal Code 3 or continuous operation, universal mounting, and low current consumption. Its compact design allows fast installation while providing dependable audible notification in commercial, institutional, and industrial environments.

Product Functions

• Provides audible fire alarm notification
• Supports synchronized operation
• Supports silenceable notification circuits
• Produces temporal Code 3 alarm signal
• Produces continuous horn signal
• Operates from regulated notification appliance circuits
• Provides high output audible signaling
• Supports reverse polarity supervision

Electrical & System Information

The U-MHST operates from regulated 20 to 31 VDC notification appliance circuits and supports synchronized operation when used with compatible Siemens synchronization modules or compatible fire alarm control equipment. The horn offers field selectable temporal Code 3 or continuous audible operation while maintaining low operating current.

The appliance includes In and Out wiring terminals that accept conductors from 12 AWG through 18 AWG, simplifying installation on supervised notification appliance circuits.

Features

• Electronic horn
• Red housing
• Universal mounting
• 20 to 31 VDC operation
• Synchronization capability
• Silenceable operation
• Temporal Code 3 tone
• Continuous tone
• High sound output
• Low current draw
• Indoor application
• Reverse polarity supervision
• In and Out wiring terminals
• Compact design
• Commercial fire alarm application

Mounting & Design

The U-MHST is designed for universal mounting on standard electrical boxes. Its compact housing installs quickly using standard mounting hardware while maintaining a clean finished appearance.

The appliance utilizes plug covers that conceal mounting screws after installation, eliminating the need for additional trim plates during flush mounting applications.

Protection & Applications

Suitable for:

• Commercial Fire Alarm Systems
• Office Buildings
• Schools and Universities
• Hospitals
• Healthcare Facilities
• Hotels
• Government Buildings
• Industrial Facilities
• Warehouses
• Apartment Buildings
• Institutional Facilities
• Indoor Notification Systems

Technical Specifications

Manufacturer: Siemens

Part Number: 500-696630

Model: U-MHST

Product Type: Electronic Horn

Operating Voltage: 20 to 31 VDC

Notification Type: Audible

Operation: Synchronizable and Silenceable

Tone Selection: Temporal Code 3 or Continuous

Housing Color: Red

Mounting: Universal Mount

Wiring: In and Out Screw Terminals

Wire Size: 12 AWG to 18 AWG

Application: Indoor Commercial Fire Alarm Systems

Supervision: Reverse Polarity Compatible

Listings: UL Listed, ULC Listed, FM Approved, CSFM Listed, and NYCFD Approved. Verify product labeling, installation instructions, local codes, and project requirements before installation.

Applications

The Siemens U-MHST is designed for commercial fire alarm systems requiring reliable audible notification with synchronization and silenceable operation. Typical applications include office buildings, hospitals, schools, universities, hotels, apartment buildings, warehouses, industrial facilities, government buildings, and other commercial occupancies requiring dependable indoor audible fire alarm notification.

U-MHST Datasheet