Selectronix, Inc.

Woodinville, WA

A Custom Product Development and Design Consulting Company


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Superstep 2100 Series Sequencing Proportional Load Controllers are all solid-state control and expansion units for use in staged electric heating systems, such as hot water and steam boiler systems. 

bulletSLC2100 Series are now a UL Recognized Component for Canada as well as US.

UL Certificate of Compliance for SLC2100 


bulletOn-board configuration for Input signal type: 2-10VDC, 4-20ma, 0-1VDC, Slidewire (135ohm)
bulletCompatible with Honeywell T775, T991, L91, and many more modulation controllers
bulletProgressive Sequencing
bulletExpansion boards provide for up to 36 steps.
bulletSeparately adjustable On Delay and Off Delay timing.
bullet2 board sizes: 1-6 steps and 1-12 steps
bulletBasic Control Units are used when no expansion units are required
bulletExpandable Control Units are used to control up to 2 Expansion Units or when the optional Remote LED display is desired.
bulletExpansion units are available with 1-12 steps, adding up to 24 steps, when 2 units are cascaded onto the Expandable Control Unit 
bulletMix or match any board and expansion unit sizes - No field re-calibration required! 
bulletIndividually adjustable On-time and Off-time delay.
bulletPilot Relay Output, Rated 5A @ 240 VAC 
bulletRelay Output is for 120 VAC contactors. 
bulletRelay Output for 240VAC contactors are available by special order
bulletIndividual LED indicator for each step
bulletOptional Remote LED display
bulletUL Recognized XAPX2 Component (File E124742)
bulletMade in the U.S.A.

Competitive Cross-Reference


Part Number

Former Part Number
  2 Step Basic Control Unit SLC2102 SLC2102M
  4 Step Basic Control Unit SLC2104  SLC2104M
  6 Step Basic Control Unit SLC2106 SLC2106M
  8 Step Basic Control Unit SLC2108 SLC2108M
10 Step Basic Control Unit SLC2110 SLC2110M
12 Step Basic Control Unit SLC2112 SLC2112M
  2 Step Expandable Control Unit  SLC2102X SLC2102XM
  4 Step Expandable Control Unit  SLC2104X SLC2104XM
  6 Step Expandable Control Unit  SLC2106X SLC2106XM
  8 Step Expandable Control Unit  SLC2108X SLC2108XM
10 Step Expandable Control Unit  SLC2110X SLC2110XM
12 Step Expandable Control Unit  SLC2112X SLC2112XM
  2 Step Expansion Unit SLC2152
  4 Step Expansion Unit SLC2154
  6 Step Expansion Unit SLC2156
  8 Step Expansion Unit SLC2158
10 Step Expansion Unit SLC2160
12 Step Expansion Unit SLC2162
Remote Indicator Panel SLC2170-xx where xx is quantity of LEDs
Cascading Cable, 2 Unit, 15" SLC2195
Cascading Cable, 3 Unit, 15" ctrs, 30" total length SLC2196 May also be used to cascade 2 units which need a longer cable
Remote Indicator Cable, 6 foot SLC2197

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See our advanced Step Controller line for new applications...Series 4000!

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Last modified: September 01, 2017