Siemens MTH-75-R-WP Weatherproof Multi-Tone Horn Strobe P/N:500-636082

The Siemens MTH-75-R-WP Weatherproof Multi-Tone Horn Strobe is an audible/visible fire alarm notification appliance designed for outdoor and wet-location applications. Siemens identifies model MTH-75-R-WP, part number 500-636082, as a weatherproof multi-tone horn/strobe.

The appliance combines a high-output strobe with a multi-tone electronic horn, providing both audible and visible emergency signaling from a single notification device.

Product Functions

• Provides audible fire alarm notification
• Provides visible fire alarm notification
• Combines multi-tone horn and strobe
• Designed for weatherproof applications
• Red housing
• FIRE identification
• Clear strobe lens
• Supports multiple selectable audible tones
• Provides high-output visual signaling
• Supports 24V notification circuits
• Provides synchronized notification with compatible equipment
• Designed for outdoor and wet-location fire alarm systems

Multi-Tone Horn

The MTH-75-R-WP provides multiple field-selectable audible signals, allowing the appliance to accommodate different emergency signaling requirements.

The MTH Series provides a broad audible range with published output levels extending approximately from:

76 to 94 dBA reverberant

depending on the selected tone and operating conditions.

The selectable-tone architecture provides greater flexibility than a standard single-tone electronic horn.

Weatherproof Operation

The WP designation identifies the MTH-75-R-WP as a weatherproof notification appliance.

It is intended for applications requiring greater environmental protection than a standard indoor horn strobe, including exterior and other approved wet-location installations.

The complete weatherproof mounting arrangement must be used to maintain the required environmental protection.

High-Output Strobe

The MTH-75-R-WP incorporates a high-intensity visual notification strobe.

Published ratings include:

UL 1638 at -40°C: 115 cd

UL 1971: 30 / 180 cd

The 180 cd rating is on-axis only under the manufacturer’s specified test conditions.

The model has historically been referred to as a 15/75 weatherproof horn strobe, while later Siemens documentation lists its high-output rating as 180 cd.

Strobe Operation

The strobe operates at approximately:

1 flash per second

through its specified operating voltage range.

The visual portion provides a clear-lens fire alarm signal intended to provide conspicuous notification in outdoor and other demanding applications.

Electrical & Notification Information

Siemens Part Number: 500-636082

Device Type: Multi-Tone Horn Strobe

Nominal Voltage: 24V

Operating Range: 16–33 VDC / VRMS

Visual Rating: 30 / 180 cd UL 1971

Cold-Temperature Rating: 115 cd UL 1638 at -40°C

Flash Rate: Approximately 1 flash per second

Housing: Red

Lens: Clear

Marking: FIRE

Environment: Weatherproof

Exact current consumption depends on the selected audible tone and operating conditions and should be calculated using the applicable Siemens technical documentation.

MTH-75-R-WP Datasheet