Edwards 757-8A-T Temporal Horn/Strobe

The Edwards 757-8A-T 110 Candela Temporal Horn/Strobe is an audible/visible fire alarm notification appliance from the Edwards Integrity 757 Series. It combines a selectable-output electronic horn with a 110 cd synchronized strobe for wall-mounted life-safety notification applications.

The 757-8A-T operates from compatible 24 VDC notification appliance circuits and provides both audible and visible synchronization when used with compatible Edwards equipment. Edwards compatibility documentation identifies the 757-8A-T as an Integrity synchronized temporal horn-strobe with both audible and visible synchronization.

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Product Functions

• Provides audible fire alarm notification
• Provides visible fire alarm notification
• Combines temporal horn and strobe
• Provides 110-candela visible output
• Supports synchronized strobe operation
• Supports synchronized temporal horn operation
• Provides selectable temporal or steady horn operation
• Provides selectable high or low horn output
• Operates on compatible 24 VDC fire alarm notification circuits
• Designed for wall-mounted notification
• Compatible with Edwards Integrity synchronization
• Supports weatherproof installation with the appropriate back box

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110 Candela Strobe

The 757-8A-T is the 110 cd model in the 757 Series temporal horn/strobe family.

Strobe Output: 110 candela

Orientation: Wall

Visible Notification: Synchronized

The 110 cd output provides higher-intensity visual notification than lower-candela models in the same series. Edwards product information specifically identifies the 757-8A-T as a 110 cd Temporal Horn/Strobe, 24 VDC, Red.

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Temporal Horn

The audible portion of the 757-8A-T can be configured during installation for:

Temporal tone

or

Steady tone.

When temporal operation is selected, horns connected to a common compatible two-wire circuit are designed to self-synchronize without requiring a separate audible synchronization module.

This allows multiple Integrity horns and horn/strobes to produce coordinated audible fire alarm signaling.

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Selectable Horn Output

The 757 Series horn provides two selectable sound-output levels:

Low: approximately 94 dBA

High: approximately 98 dBA

These published values are measured at 10 feet in an anechoic chamber under the manufacturer’s specified conditions.

The appropriate output level is selected according to the audible notification requirements of the installation.

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Synchronized Strobe Operation

The visible portion of the 757-8A-T incorporates an Integrity synchronized strobe.

Edwards documentation identifies Integrity strobes as synchronizing to applicable UL 1971 requirements when operated from an appropriate synchronization source.

Current Edwards compatibility documentation specifically identifies the 757-8A-T as supporting:

Audible Synchronization: Yes

Visible Synchronization: Yes.

This allows multiple horn/strobes in the same notification area to operate in a coordinated manner.

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24 VDC Notification Operation

The 757-8A-T is designed for nominal 24 VDC fire alarm notification circuits.

Edwards documentation notes that the strobe must be connected to a notification circuit providing a constant, non-pulsed voltage. The horn can then generate the required temporal pattern internally when configured for temporal operation.

This distinction is important because externally pulsing power to the strobe is not the intended method for generating the flash pattern.

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Strobe Current

Published 757 Series specifications identify the 110 cd strobe operating current at 16 V as approximately:

16 VDC RMS Current: 329 mA

16 VFWR RMS Current: 420 mA.

Actual notification appliance circuit calculations should use the manufacturer’s applicable current tables for the voltage and system configuration being designed.

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Conventional Notification Appliance

The Edwards 757-8A-T is a conventional notification appliance, not an individually addressable device.

It operates from compatible notification appliance circuits, with synchronization provided by compatible Edwards control equipment or synchronization sources.

The appliance does not independently use a Signature address or other addressable-device identifier.

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Weatherproof Installation

The 757-8A-T can also be used in a weatherproof installation when paired with the appropriate Edwards enclosure.

Project documentation identifies:

757-8A-T — Weatherproof Horn/Strobe Unit

with:

757A-WB — Weatherproof Back Box.

The weatherproof back box is therefore an important accessory when the appliance is installed in an exterior or other location requiring environmental protection.

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Installation Information

The 757 Series is designed to fit a standard North American two-gang electrical box with a minimum published depth of approximately 2¾ inches / 69 mm.

For surface installations, compatible Edwards surface boxes can be used. Weather-exposed applications require the appropriate weatherproof enclosure.

Typical installation includes connecting the notification circuit, selecting temporal or steady horn operation, selecting high or low audible output, mounting the appliance, restoring the notification circuit, and testing both horn and strobe synchronization.

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System Compatibility

The 757-8A-T appears in Edwards compatibility documentation for multiple fire alarm platforms.

For example, Edwards’ iO64/iO500 compatibility list identifies the 757-8A-T as an Integrity synchronized temporal horn/strobe with both audible and visible synchronization.

The EST3X compatibility documentation also specifically lists 757-8A-T among supported notification appliances.

Edwards F-Series documentation likewise includes the 757-8A-T in its compatible notification appliance list.

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Related 757 Series Models

The 757 Series includes several temporal horn/strobe configurations with different visible outputs, including:

757-3A-T

757-5A-T

757-7A-T

757-8A-T

Corresponding white versions use the W suffix, such as 757-8A-TW. Edwards compatibility documentation groups these models together as Integrity synchronized temporal horn/strobes.

The 757-8A-T is specifically the red 110-candela version.