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Nelson™ Heat Trace SMMC-3 Multi-Sensor Snow/Ice Melting Controller
Nelson™ Heat Trace snow melting system is made up of MI (mineral insulated) cable.
It is used for the electric heating of paved surfaces such as sidewalks, driveways and parking ramps is an efficient, economical method of preventing snow and ice accumulation. Heat Trace electrical snow melting systems replace older, less efficient means of snow removal such as heated water or oil circulating systems, plowing or shoveling, and offer an effective alternative to the application of salts and other chemicals which result in pavement damage and environmental pollution.
Nelson™ Heat Trace SMMC-3 Multi-Sensor Snow/Ice Melting Controller


Certifications and Compliances
cULus Listed: Ordinary Locations
Power Requirements
120 Vac, 450 VA
System Memory
Non-volatile; no data loss with a loss of system power
Control Relays
120 Vac, 1 Amp contacts
Manual Bypass
Manually cycles from 0-10 hours in half-hour increments
Ambient Operating Temperature Range
-20 °C to +70 °C (-4 °F to +160 °F)
Storage Temperature
-20 °C to +85 °C (-4 °F to +185 °F)
Relative Humidity
0 to 90% RH, non condensing
NEMA 12 non-metallic enclosure
12.375" W x 10.25" H x 4.75" D


  • Automatic snow/ice melting control
  • Housed in an enclosure suitable for commercial/industrial applications (NEMA 12) and features an LCD display, programming and associated indicator lights for operation of each zone
  • Monitors and controls 3 separate zones, sequentially or independently
  • Control signal relays operate external contactors
  • Manual zone activation
  • Hold on time; adjustable 0-10 hours in half-hour increments
  • Maximizes energy efficiency
  • Reduced power requirements when priority operation mode is used
  • Operating Mode 1 – Independent. Programmable for 3 independent snow melting systems (zones) for any combination of snow/ice melting or roof, Gutter de-icing systems; controlling any combination
  • Operating Mode 2 – Priority. Sequentially operating 3 snow melting zones with individual zone priority level of 1 to 3; with one in-ground sensor per zone and an optional Aerial Moisture sensor for priority zone 1