Rev. 2 - 11/06
The Alpha Communications®/S.T.R.™ SP300 in-
telligent controller is used only with the HT3011W
ReliaBUS™ series intercom and VH30-2D video-
intercom systems. The SP300 provides the intelligent
'BUS' circuitry needed to control the ReliaBUS™
Each SP300 gets its power from the NTR211 power
supply. All SP300 field connections are positive
screw terminal type, or plug-in type.
For systems up to 56 apartments, use 2- SP300 units.
For systems of 57-88 apartments, use 3- SP300 units.
For systems of 89-120 apartments, use 4- SP300
• 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, or approved
equal. The SP300 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 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 shall be
mountable right to the surface of the wall or in a
customer-supplied junction box cabinet.
Contractor shall observe all local and national
electrical and building codes.
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42 Central Drive • Farmingdale NY 11735-1202 • Phone (631) 777-5500 • Fax (631) 777-5599