Rev. 3 - 02/09
ARCHITECTS' AND ENGINEERS'
The specialty relay assembly shall be Alpha Communi-
cations® PK407A or equivalent. Relay shall operate
from a 16VAC primary voltage source, and shall pro-
vide a 'Form C' dry contact relay output, as long as the
16VAC source is present. All wiring to relay shall be
low-voltage Class II wiring, installed as per all federal,
state, and local electrical codes. Relay shall surface
mount right to the finished wall and shall be installed in
a suitable environment that is free from excessive dirt,
dust, temperature, humidity, grease and water.
Contractor shall observe all local and national electri-
cal and building codes.
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The Alpha Communications® PK407A specialty relays
are used for a variety of reasons. The PK407A can be
connected to a standard 16VAC electric door opener
output from many intercom amplifiers to allow connec-
tion to a magnetic or different type or voltage door
opener. It can also be used to provide a 'Form C' relay
contact from virtually any 16VAC input source. The
PK407A can even be powered directly from a 16VAC
As long as a 16VAC source is present, the PK407A will
engage, providing a normally-open and a normally-
closed set of contacts, with a shared 'common' screw
The PK407A relays are designed to easily surface
mount right onto the finished wall by means of self-stick
mounting tabs or by using the mounting holes provided
for screw mounting.
Connections are positive screw terminal type, using a
barrier type terminal connector strip.
• Easily Installs Right on Finished Wall Surface
• Operates on Safe Low-Voltage Class II Wiring
• Provides a 'Form C' Type Relay Output
• Convenient Barrier Type Screw Terminal Connec-