A Series and B Series Power Controllers (Series 101, 102, 103, & 108 )

Available as Model A (master) and Model B (slave), Indeeco power controllers are solid state, zero-cross fired, proportional devices. Line voltage is switched 0 – 100% linearly, with respect to the input range. A 1 second time-base controls power to the load.  For example, a 5VDC signal to a 0 -10VDC input will cycle the output full on for 0.5 seconds and full off for 0.5 seconds.


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Standard Features

Notable features of these controls include an LED to indicate when the output is on and for safety purposes if the input signal is disconnected or shorted the output will be de-energized.

Masters can operate alone or can drive additional slaves to control multiple loads. Other VDC type controls can drive slaves.

Short Circuit Current Ratings (SCCR) up to 100KA available, well above the default 5KA value for typical SCR power controllers.

Series 101, 102, 103, & 108 Power Controllers Model A – (Master)

  • Zero-cross fired solid-state relays, heatsink, and proportional control circuit board
  • Up to four field-selectable inputs;
    • Series 101/102/103: 2200 ohm, 135 ohm, 4-20mA, 0-10VDC (with LED indicator)
    • Reverse polarity protection with LED indicator for 0-10 VDC, 4-20 mA
    • Series 108: 4-20mA, 0-10VDC
  • Rated up to 600VAC, 50 amps, single or three phase
  • Master (Model A) and slave (Model B) units can be combined for higher amperages
  • Multiple panel mountings: through, inside, and weatherproof
  • Heatsink and inputs electrically isolated from high voltage
  • Separate 24VAC, 10VA, Class II transformer required

Series 101, 102, 103 & 108 Power Controllers Model B - (Slave)

  • Zero-cross fired solid-state relays and heatsink
  • Can be driven by digital controls and thermostats
  • Accepts pulsed DC input within 4 – 32VDC range per relay
    • 4 – 32 VDC control voltage for single phase controllers
    • 8 – 32 VDC control voltage for three phase controllers
  • Rated up to 600VAC, 50 amps, single or three phase
  • Heatsink and inputs electrically isolated from high voltage


UL Recognized
File E52105 Guide XAPX2 and XAPX8

Storage Temperature
-40°F to 168°F (101, 102, 103 and 108 Series)

4000Vrms input to output

2500Vrms input/output to heatsink

Control Voltage
24VAC, 10VA (masters only)

Input Impedance (Masters only)
250Ω (mA), 47KΩ (VDC)

Input Wire Range
18-22 AWG, copper only

Line Voltage
48-600VAC (+/-10% of model’s rated voltage)

47 to 63 Hertz

Load Current
0.1A to model’s max current rating

Load Wire Range
6-14 AWG, copper only

Maximum Slaves per Master


Duct Heaters

Air Curtains

Process Air Heaters

Immersion Heaters

Drying Equipment

Industrial Ovens

Closed Tank Heating

Watt Density

Percentage of Wattage

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