Rev. 1 - 01/98
Copyright© 1997-2000, Alpha Communications®, All Rights Reserved
42 Central Drive • Farmingdale NY 11735-1202 • Phone (631) 777-5500 • Fax (631) 777-5599
TOLL-FREE 1-800-666-4800 • Web: www.AlphaCommunications.com • Email: firstname.lastname@example.org
Due to continuous product improvement, all colors, sizes, materials,
finishes and specifications are subject to change without notice.
ARCHITECTS' AND ENGINEERS'
The power supply shall be Alpha Communications®/
S.T.R.™ model VRU, or approved equal. Amplifier
shall operate from a 16VAC (40VA) U.L. Listed
transformer (model SS146). All wiring to power
supply shall be low-voltage Class II wiring, installed
as per all federal, state, and local electrical codes.
Power supply shall surface mount right to the fin-
ished wall and shall be installed in a suitable environ-
ment that is free from excessive dirt, dust, tempera-
ture, humidity, grease and water. Power supply shall
provide the DC signaling power for proper system
operation of up to four (4) video-intercom monitor
units. For most secure installation, power supply
may be installed into a lockable equipment cabinet/
Contractor shall observe all local and national elec-
VRU Power Supply
The Alpha Communications®/S.T.R.™ VRU power
supplies are used with the S.T.R.™ video-intercom sys-
tems, to provide DC power to operate up to four (4) video
The VRU units each require a 16VAC (40VA) low-
voltage Class II (model #SS146) transformer for power.
Use one (1) plug-in transformer for each VRU.
These VRU power supplies are designed to easily surface
mount right onto the finished wall by means of customer
supplied screws or the convenient plastic 'Din Rail' bracket
supplied with each power supply. Connections are posi-
tive screw terminal type.
Easily Installs Right on Finished Wall Surface or in Cus-
tomer Supplied Housing
• Operates on Safe Low-Voltage Class II Wiring (fused)