Rev. 2 - 11/06
The Alpha Communications®/S.T.R.™ SP300-12K
intelligent controller is used only with the HT3011W
ReliaBUS™ series intercom and VH30-2D video-
intercom systems. The SP300-12K provides the
intelligent 'BUS' circuitry needed to control the
ReliaBUS™ system functions.
Each SP300-12K gets its power from the NTR211
power supply. All SP300-12K field connections are
positive screw terminal type, or plug-in type.
For systems up to 56 apartments, use 2- SP300-12K
units. For systems of 57-88 apartments, use 3-
SP300-12K units. For systems of 89-120 apart-
ments, use 4- SP300-12K units.
• Easily Installs Right on Finished Wall Surface or in
Optional Junction Box
• Operates on Safe Low-Voltage Class II Wiring
• Positive Screw Terminal and Plug-in Connectors
Height: 3.75" (96mm)
Width: 4.25" (108mm)
2.375" (61mm) from mounting
Construction: High impact Black ABS plastic case
Positive screw terminal and plug-in
0-50 degrees C.
Surface-mounted (usually installed near
the system amplifier/power supply and
other system central equipment).
ARCHITECTS' AND ENGINEERS'
The intelligent controller(s) shall be Alpha Commu-
nications®/S.T.R.™ model SP300-12K, or approved
equal. The SP300-12K shall be built into a rugged
high impact ABS plastic case, and shall be powered
by the model NTR211 power supply. Contractor
shall furnish the proper number of SP300-12K units,
depending upon system capacity.
Low voltage wiring shall be used and positive screw
terminal and plug-in connectors shall be provided for
installation wiring. The SP300-12K shall be mount-
able right to the surface of the wall or in a customer-
supplied junction box cabinet.
Contractor shall observe all local and national elec-
trical and building codes.
Copyright© 2004-2006, Alpha Communications®, All Rights Reserved
42 Central Drive • Farmingdale NY 11735-1202