Product Specification Sheet APS844

Rev. 07/2013

NH201TT-3 Amplifier/Power Supplies

NH201TT-3 (Shown with Housing)
Architects' And Engineers' Specifications
The amplifier/power supply unit(s) shall be Alpha Communications® / S.T.R.™ model NH201TT-3 or equivalent. Power supply unit(s) shall operate from a U.L. Listed transformer (model T1240). All wiring to power supply/amplifier shall be low-voltage Class II wiring, installed as per all federal, state, and local electrical codes.

Power supply/amplifier shall be designed to mount directly into the 'TT' or 'TTM' series lobby entry panel stations. Power supply/amplifier shall contain the system amplifier, power supply, speaker and microphone, all in one 'snap-in' assembly. Unit shall snap onto the panel front speaker/microphone grille.

Power supply/amplifier shall provide the intercom amplification and signalling power for the proper system operation. Power supply/amplifier shall be installed a safe distance from any source of electrical interference.

Contractor shall observe all local and national electrical and building codes.

NH201TT-3 3-Wire Amplifier / Power Supplies

These Alpha Communications® / S.T.R.™ NH201TT-3 series amplifier/power supplies are used with the HT2001 series handset stations to provide intercom amplification and power to operate the associated intercom system, and certain optional components and/or accessories, such as electric door opener(s) etc.

The NH201TT-3 powers from a 12VAC (40VA) low-voltage Class II transformer.

The NH201TT-3 amplifier/power supplies are designed to easily mount right onto the plastic speaker/microphone grille in the 'TT' and 'TTM' series lobby entry intercom panels.

The PC boards are treated with a special chemical finish, to minimize the affects of weather and moisture on the electronic components.

  • Easily Installs Right Behind Lobby Entry Panel
  • Operates on Safe Low-Voltage Class II Wiring
  • Clear Voice Fidelity with Adjustable Voice Volume Control
  • Convenient Screw Terminal Connections
  • High quality Half-Duplex Voice Communications


3.375"W (86mm) x 5.625"H (143mm) x 1.25"D (32mm).

Volume: Built-In Adjustable Volume Control (potentiometer).

Positive Screw Terminal Connectors.

Alpha Communications
42 Central Drive • Farmingdale • NY • 11735-1202 • Phone: (631) 777-5500 • Fax: (631) 777-5599
TOLL-FREE: (800) 666-4800 • Web: • Email:
Copyright© 1998-2019 Alpha Communications® - All Rights Reserved.
Due to continuous product improvement, all colors, sizes, materials, finishes and specifications are subject to change without notice.