The patented SC-40C Satellite Contactor is a
power control peripheral for a APS-4C Snow
Switch and similar Environmental Technology,
Inc. products. The APS-4C Snow Switch
operates the SC-40Cs whenever its contactor
operates. That is, during snow and for the
hold-on time thereafter.
The integral ground fault circuit interrupter
(GFCI) along with a test/reset facility ensure
safety along with NEC and local code compliance.
Partitioning heater loads for multiple
SC-40Cs prevents the nuisance GFCI tripping
that is often unavoidable when controlling a
large system with a single contactor. The selftest
facility operates heaters for one minute
with a duty cycle limited to 33% for safer
heater testing during the summer months.
An APS-4C operates up to ten SC-40Cs. The
size and location of the heaters determines
the number of SC-40Cs required. The APS-4C
and its SC-40Cs can be separated by up to
Supply voltage options include 277 volt
single-phase, 208-240 volts 3 phase, or
277/480 volt 3 phase, with a contactor rating
of 50 amps per pole. For installation simplicity,
SC–40C control wiring is NEC Class 2.
The SC-40C’s non-metallic enclosure is rated
for protected NEMA 3R locations in the temperature
range of -40˚ to 160˚F (-40˚ to 60˚C).