DESCRIPTION

The patented SC–40 Satellite Contactor is a power control peripheral for a APS–4 Snow Switch and similar Environmental Technology, Inc. products. The APS–4 Snow Switch operates the SC–40s whenever its contactor operates. That is, during snow and for the hold?on time thereafter.

The integral 30 mA 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–40s prevents the nuisance GFCI tripping that is often unavoidable when controlling a large system with a single contactor. The self-test facility operates heaters for one minute with a duty cycle limited to 33% for safer heater testing during the summer months.

An APS–4 operates up to ten SC-40s. The size and location of the heaters determines the number of SC-40s required. The APS–4 and its SC–40s can be separated by up to 1,000ft (305m).

Supply voltage options include 240 single phase or 208, 277 and 480 volts 3 phase, with a contactor rating of 50 amps per pole. For installation simplicity, SC–40 control wiring is NEC Class 2.

The SC–40's non-metallic enclosure is rated for protected NEMA 3R locations in the temperature range of −40° to 160°F (−40° to 60°C).