Watlow QPAC Series SCR Power Controller
Starting at $2,506.00


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  • 200KA short circuit current rating (SCCR)
  • Modular power controller
  • 1-phase, 3-phase (2-leg), or 3-phase (3-pair) options
  • Available in 150 to 1000A rating
  • Rugged design for 122°F (50°C) ambient operation
  • Solid state contactor, burst firing or phase-angle fired mode
  • Vertical mount
  • Diagnostic capabilities
  • UL 508 listed and C-UL up to 1000A

The Watlow QPAC Series SCR Power Controller is a modular Silicon Controlled Rectifier (SCR) power controller with plug-in features for flexibility. Bases are rated from 150 to 1000 amperes in one-phase, three-phase, two leg and three-phase, three leg.

A variety of transformers from 120 to 575VAC along with 50/60Hz operation enable the QPAC to operate in applications anywhere. Plug-in control cards set the QPAC's SCR firing modes; solid state contactor, burst firing (zero cross) or phase-angle models are available with a wide variety of options. This power controller includes 200KA short circuit current rating (SCCR) and high speed fuses to minimize damage in the event of a short circuit.

Applications for hte QPAC Series include:

  • Furnace and ovens
  • Petrochemical
  • Heat treating
  • Duct heating
  • Environmental chambers
  • Kilns
Watlow QPAC Current Transformer
150A, 200A, 300A, 400A, 500A, 600A, 800A and 1000A options
Watlow 08-5362 Manual Control Kit
Manual control kit for the QPAC series
Watlow 16-0176 Interstage Transformer
5A, 20mA interstage transformer