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ETI MODEL SC 40 Satellite Contactor. Automatic Snow/Ice Melting System Accessory.

ETI Snow and Ice Melting Controls and Sensors
We are an authorized stocking distributor for ETI (Environmental Technology Inc.)


Low cost control of larger snow melting systems 


Contactor rating of 50 amps per pole 
Supply options: 208, 240, 277 and 480 volts 
Single and three-phase power control 
Integral 30 mA GFCI 
U-L Listed, CSA Certified 
Self-test feature 
Simple installation 
Low Cost


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 nonmetallic enclosure is rated for protected NEMA 3R locations in the temperature range of -40 to 160 F (-40 to 60 C). 

Installation and Operation Manual

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5880 Alpine Ave. NW - Comstock Park, MI 49321  USA
Tel 616-784-1121 - 800-442-2581 - Fax 616-784-7775

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