The SC–40C Satellite Contactor answers the
need for cost effective modular snow melting
heater control. One or more SC–40Cs, when
used with an APS–4C Control Panel acting as
the master control, allow for modular snow
melting system design. There is no limit to the
number of SC–40Cs that can be interfaced in
a single system. This approach reduces front
end design, hardware and installation costs
while providing a number of useful features
that would be otherwise too expensive and
complex to implement.
The SC–40C provides the same advanced
patented and patent pending Ground Fault
Equipment Protection (GFEP) as required by
the USA and Canadian National Electric codes
that is found on the APS–4C. Upon sensing
a ground fault condition, an SC–40C inhibits
operation of its contactor until manually reset.
Circuits without a ground fault continue to
operate normally thus partitioning defective
The adjustable hold-on timer can initiate
heater operation on each SC–40C for up to
10 hours to ensure complete melting and to
compensate for differences between zones.
The optional RCU–4 Remote Control Unit can
be located where system operation can be
conveniently observed. It duplicates many of
the controls and indicators on the SC–40C
Each SC–40C provides a complete energy
management computer (EMC) interface. This
feature provides remote access for advanced
applications requiring remote or zone control
along with remote annunciation.
Each SC–40C maintains communications to
and from the APS–4C using a 3-wire cable.
Thus, the APS–4C alarms ground faults occurring
anywhere in the system. The SC–40C
also inserts a short time delay between the
operation of each contactor thus improving
power quality by limiting the inrush current.
The RCU–4 Remote Control Unit supplied
permits overriding zone control in applications
requiring the capability.
The SC–40C is interchangeable with the
earlier SC–40. For complete information
describing its application, installation and
features, please contact your local Chromalox