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ETI MODEL APS-4 Snow Switch. Automatic Snow/Ice Melting System Controller.

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

Links to other ETI products:
MODEL CIT–1 Snow Sensor
MODEL GIT–1 Automatic Gutter Deicing Control
MODEL SIT–6E Pavement-Mounted Sensor 


Automatic snow/ice melting control 
Minimum energy costs 


Multiple sensor capability 
Remote control option 
Controls up to 10 satellite contactors 
Timed heater cycle capability 
U-L Listed, CSA Certified 
Single and three-phase power control 
Supply options: 208, 240, 277 and 480 volts 
Contactor rating of 50 amps per pole 
Simple installation 


The patented APS-4 provides effective, economical automatic control of snow melting systems including those for gutter and down spouts. The ability to use multiple sensors ensures optimum control of large systems. 

Supply voltage options include 240 volt single phase or 208, 277 and 480 volts 3-phase, with a contactor rating of 50 amps per pole. The integral 30 mA ground fault circuit interrupter with a test/reset facility ensures safety along with NEC and local code compliance. The APS-4 operates up to ten SC-40 Satellite Contactors for larger loads. 

The adjustable 10 hour hold-on timer keeps heaters operating after snow stops to ensure complete melting. A cycle switch can be used to operate heaters for the hold-on timer setting. This useful feature melts tracked or blowing snow or ice. LED indicators permit monitoring snow melting system operation. 

The optional patented RCU-1 Remote Control provides monitoring and control of the snow melting system at a convenient location. 

For installation simplicity and low cost, sensors, the RCU-1, and satellite contactor control wiring is NEC Class 2. The APS-4's non-metallic enclosure is rated for protected NEMA 3R locations in the temperature range of -40º to 160º F (-40º to 60º C). 

Installation and Operation Manual

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We are a Distributor of Industrial, Commercial and Residential Heaters and Controls. Always consult manufacturers installation instructions for proper installation of the products or systems shown on this website. © Copyright 1999-2019 Mor Electric Heating Assoc., Inc.

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

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