Federal Signal AD-27-3 - Intercom, 120VAC, T/L Switch, Volume Control, Auxiliary Signal Ready
Federal Signal

AD-27-3

Alternate Item Number: ad-27-atkinson-dynamics-intercom

UPC: 782979207108


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Overview

The Federal Signal AD-27-3 is a robust industrial intercom designed for high‑voltage environments, operating at 120 VAC to meet stringent safety and performance standards. Equipped with a T/L (Talk‑Listen) switch, users can initiate or receive calls with a single press, streamlining communication in busy facilities. Integrated volume control allows operators to adjust audio levels on the fly, ensuring clear conversations regardless of ambient noise. The unit is also auxiliary signal ready, enabling seamless integration with existing building automation or security systems. Built with durable components and a compact footprint, the AD-27-3 fits easily into control panels or wall mounts, providing reliable, low‑maintenance communication for manufacturing plants, warehouses, and industrial sites. Federal Signal’s reputation for quality and innovation is reflected in this model, which delivers dependable performance, easy installation, and long‑term durability. Whether you need a simple intercom for departmental coordination or a more advanced system that interfaces with broader infrastructure, the AD-27-3 meets the demands of modern industrial operations.
  • 120VAC voltage rating
  • T/L switch for call initiation
  • Built-in volume control
  • Auxiliary signal ready
  • Manufacturer: Federal Signal, SKU AD-27-3

Specifications

-31 to 150
DEG F
5.03
IN
6.5
in
9.88
IN
Application
Indoor/Outdoor
Brand Name
Federal Signal
Enclosure
Type 4X
Frequency Response
320 Hz - 8.0 kHz
Height
9.88 IN
Length
5.03 IN
Mounting
Wall
Mounting Type
Wall mount or control panel
Number Of Lines
One
Operating Current
0.24 AMP
Operating Temperature
-31 to 150 DEG F
Operating Temperature, Maximum
150 F
Operating Temperature, Maximum
65.5556 C
Operating Temperature, Minimum
-31 F
Operating Temperature, Minimum
-35 C
Operating Voltage
120VAC
Series
AD
Special Features
Balanced Line Output
Standard
UL Listed/cUL Listed/CSA Certified/Marine Listed
Standard
CSA,Marine,UL,cUL
Sub Brand
Atkinson Dynamics
Type
Wall Mount Intercom
Type
Intercoms
Voltage Rating
120 VAC
Width
6.5 IN
Package Dimensions (L x W x H)
8.13 IN x 7.25 IN x 15.13 IN
Package Dimensions (L x W x H)
20.6502 cm x 18.415 cm x 38.4302 cm
Package Weight (Imperial)
10.700 L
Package Weight (Metric)
4.854 kg
Intercom, 120VAC, T/L Switch, Volume Control, Call Button, Foot Pedal Ready

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AD-27P

Atkinson Dynamics Panel Mount Intercom, 120VAC - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
Atkinson Dynamics Panel Mount Intercom, 120VAC, Primary Unit - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.

AD-27PC

Atkinson Dynamics Panel Mount Intercom, 120VAC, Primary Unit - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
Atkinson Dynamics Panel Mount Intercom, 120VAC, Call Button - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.

AD-27PA

Atkinson Dynamics Panel Mount Intercom, 120VAC, Call Button - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
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AD-27-2W3

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AD-27D-4

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AD-27A-3-4

Atkinson Dynamics Wall Mount Intercom, 120VAC, Call Button, Auxiliary Signal Ready, Extreme Conditions - Available in 12VDC, 24VDC, 120VAC or 240VAC. Heavy-duty industrial intercom for indoor or outdoor applications. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Balanced line output. 25 watt speaker. Cast aluminum housing with rugged powder coat finish. Conformal coated PCB. Type 4X enclosure. Marine Listed. CSA Certified. UL and cUL Listed.
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AD-27C-2

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Frequently Asked Questions

What is the AD-27 intercom's power requirement?

The AD-27 model operates on 120VAC 50/60Hz, with an operating current of 240 mA and a standby current of 83 mA.

Can the AD-27 intercom be used outdoors?

Yes, the AD-27 is a heavy-duty industrial intercom designed for both indoor and outdoor applications, featuring a Type 4X enclosure and marine listing.

What is the operating temperature range for the intercom?

The intercom can operate in temperatures ranging from -31°F to 150°F (-35°C to 66°C).

What is the speaker's power rating?

The intercom features a reliable 25-watt speaker.

What are the dimensions of the AD-27 intercom?

The AD-27 intercom has a height of 9.88 in, a width of 6.50 in, and a depth of 5.03 in.

What certifications does the AD-27 intercom hold?

The AD-27 intercom is UL and cUL listed, CSA Certified, and Marine rated.

What is the purpose of the -3 optional feature?

The -3 optional feature provides an auxiliary signal, which is a remote call button activated contact closure to activate a remote strobe for additional attention gathering.

Is the strobe included with the -3 auxiliary signal feature?

No, the LP3 strobe, which is activated by the -3 auxiliary signal feature, is sold separately.

What is the frequency response of the intercom?

The frequency response for the intercoms is 320Hz - 8.0Khz.

What type of housing does the intercom have?

The intercom features a corrosion-resistant cast aluminum housing with a rugged powder coat finish, providing a Type 4X enclosure.

How to Install the AD-27 Intercom

This guide provides step-by-step instructions for installing and setting up the AD-27 intercom system, including mounting, wiring, and initial configuration.

Estimated time: 45m

Tools needed:

Screwdriver, Wire strippers, Multimeter

Supplies needed:

Mounting screws, 1K, 1W resistor, Audio cables

  1. Select the mounting location

    Choose a flat and rigid surface for mounting the intercom, ensuring it can support the weight of the unit.

  2. Mount the intercom

    Secure the intercom to the selected surface using the two mounting ears and appropriate screws. Ensure it is level and firmly attached.

  3. Connect the power supply

    Plug the intercom into a nearby power source. For AC models, connect the hot, neutral, and ground wires according to the wiring diagram provided.

  4. Wire the audio connections

    Connect the audio inputs in parallel using the appropriate audio cables. Ensure the cables are sized correctly for your installation.

  5. Install the resistor

    If required, install the included 1K, 1W resistor across the audio lines to reduce noise. Only one resistor is needed for the entire system.

  6. Test the installation

    After completing the wiring, restore power and test the intercom system to ensure all connections are functioning properly.

Frequently Asked Questions about Federal Signal

What certifications and standards do Federal Signal products comply with?

Federal Signal products are certified across multiple international standards, including UL (Underwriters Laboratories) in the USA, CSA (Canadian Standards Association), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia and New Zealand). Their products meet rigorous safety and performance standards for industrial environments, with specific compliance in electrical equipment enclosures, functional safety, and environmental protection ratings.

What is Federal Signal's warranty policy?

Federal Signal offers a comprehensive limited warranty covering most products for 1-5 years from the date of delivery, with specific terms varying by product category. Mechanical sirens, beacons, speakers, and sounders typically receive 5-year parts and labor coverage, while electronic sirens and controllers generally have 2-year warranties. All warranties require return to the factory for service, and on-site services are not included. Certain components like domes, lenses, lamps, and batteries are specifically excluded from warranty coverage.

What industries and applications are Federal Signal products used for?

Federal Signal products are used across multiple critical industrial and municipal sectors for notification, communication, and safety systems. Their product lines cover essential applications including fire alarm systems, public address and telephony, outdoor warning systems, visual and audible signals, and emergency communication networks. Key industries served include manufacturing, municipal emergency services, industrial facilities, and infrastructure environments where clear, reliable communication and safety signaling are paramount.

What technical support does Federal Signal offer?

Federal Signal offers comprehensive technical support through their dedicated [email protected] email and direct phone line at +1 708.534.4756. Their support covers a wide range of notification and communication solutions, including technical assistance for products in public address, telephony, fire alarm, visual and audible signals, outdoor warning systems, and intercoms.

What are the main product lines offered by Federal Signal?

Federal Signal offers comprehensive notification and communication solutions across multiple product lines, including Visual Signals, Audible Signals, Telephony, Intercoms, Fire Alarm, Outdoor Warning Systems, Public Address, and Initiating Systems. Their product range is designed to provide clear communications and critical process notifications that enhance safety and compliance in industrial and public environments.

What are the key features of Federal Signal products?

Federal Signal products are comprehensive notification solutions designed to enhance safety and communication across industrial environments. Their key features include visual and audible signals, fire alarm systems, outdoor warning systems, public address capabilities, telephony, and intercoms. These products provide critical process notifications, ensure safety compliance, and offer advanced technologies like secure encrypted communication, cloud-based control systems, and customizable emergency response interfaces.

What environmental ratings do Federal Signal products have?

Federal Signal products offer robust environmental ratings across multiple standards, including UL 508A, CSA, NEMA, and IEC 60529. Their enclosures are rated for Type 1, 2, 3, 4, 4X, 12, and 13 environments, with IP66 protection, and can operate in temperatures ranging from -40°F to 266°F. These ratings ensure superior protection against dust, water, corrosion, and extreme conditions for indoor and outdoor industrial applications.

What accessories are available for Federal Signal products?

Federal Signal offers multiple accessories for their signaling products, including coupling kits, cable entry adapters, indicator rings, legend plates, and mounting brackets. Key accessories include E-Box endcap kits with M20 and M25 openings, U-Brackets for dual configurations, and color-coded indicator rings in black, blue, green, magenta, red, and yellow. Additional options like adapters for NPT connections and specialized mounting hardware are also available for their Global Series signaling platforms.

What communication protocols do Federal Signal products support?

Federal Signal supports multiple industrial communication protocols including PROFIBUS DP, PROFINET, EtherNet/IP, CANopen, and Modbus RTU. These protocols enable flexible network integration across various industrial automation environments, supporting both traditional fieldbuses and modern Ethernet-based communication standards.

How are Federal Signal products typically installed?

Federal Signal products are typically installed using professional mounting configurations that include wall brackets, base stations, and specialized mounting hardware. Depending on the specific product line—such as outdoor warning systems, visual signals, or audible signals—installation involves precise mounting options like wall-mount antenna brackets, base station radio packages, and modular component assemblies. Each product configuration includes specific mounting accessories like endcaps, adapters, and terminal blocks to ensure secure and compliant installation in industrial and safety-critical environments.