Product Specification Sheet APS521

Rev. 07/2013

HT3011 Series 2-Wire ReliaBUS™ Loop Handsets

This Specsheet is for a product which is discontinued. Please contact us for alternative products.

HT3011A (Anthracite) Handset shown with
optional UM3004A Flush Adaptor and Trim
Ring and HT3011W (White) Handset shown
with optional TZ1003WH Desk Adaptor

Architects' And Engineers' Specifications

The handset station(s) shall be Alpha Communications® / S.T.R.™ ReliaBUS™ HT3011 (2-Wire) in (White or Anthracite) color. Handset(s) shall be mounted (surface, flush or desktop). Handset(s) shall feature electret condenser microphone for exceptional digital voice fidelity. Handsets that include carbon transmitter or other voice technologies shall not be acceptable. Handset shall have a textured finish and heavy-duty coil cord. Handset shall include a door release (KEY SYMBOL) button and auxiliary (ROUND DOT) push button. Push buttons shall be clearly visible and shall be marked in a different color. Handset(s) shall include a built-in electronic call tone signal. Handset(s) shall require only two (2) common (loop) wires for system operation.

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

HT3011 Series Handsets

The Alpha Communications®/S.T.R.™ HT3011 ReliaBUS™ Series handsets are designed to work as an apartment type handset intercom station, using a minimal of wiring. All HT3011 handsets in a building can be wired on only two (2) common (loop) wires! Choose from White or Anthracite (Charcoal) colors. 

These attractive handsets easily surface mount right on the wall or over a single gang flush electrical back box (or plaster ring). Handsets can be changed to desk mount with the addition of a model TZ1003 desk adapter, or can be flush mounted with the addition of a Model UM3004 flush housing/trim assembly. 

All HT3011 series ReliaBUS™ handsets feature textured finish (to minimize scratches and fingerprints), electronic tone signaling, heavy duty replaceable coiled cord and (2) two momentary button switches. These switches can be used for door release, or other signalling functions, depending upon system configuration.

NOTE: When replacing the (white only) handsets used on the VH30-2D and/or VH30C-2D ReliaBUS™ video-intercom monitors, use only handset model HT3011VW.


  • Convenient Digital Duplex Voice Operation
  • Easy Installation - Only 2 Common (loop) Wires Required
  • Eavesdrop Privacy
  • Clear Voice Fidelity using Electret Condenser Microphones
  • Rugged and Reliable / Simple to Operate
  • Mounts Flush, Surface or Desk
  • HT3011 available in White or Anthracite (Charcoal) color

All HT3011 series handsets are 3.75"W (96mm) x 8.75"H (223mm) x 2.60"D (67mm). All dimensions shown are for the surface wall type handset, less the coiled cord.
50mm round, 45 ohms, Model HK1.
Electret Condenser Type
Push Buttons:
(1) with Door Opener (KEY) symbol and (1) spare (Round Dot).
Alpha Communications
42 Central Drive • Farmingdale • NY • 11735-1202 • Phone: (631) 777-5500 • Fax: (631) 777-5599
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Due to continuous product improvement, all colors, sizes, materials, finishes and specifications are subject to change without notice.