When your equipment is down due to an emergency or long lead times and you need custom heaters in a hurry, why wait? Southwest Heater & Controls offers rapid shipment on custom heaters and sensors that usually require 3-4 weeks lead time for delivery.






SCR Controls



Watlow Power Series SCR

SCR ControllerWatlow Power Series controllers include single-phase and 3-phase models with field configurable phase-angle or zero cross firing for application flexibility.


On-board semiconductor fusing improves reliability by protecting the SCRs from heater short circuits.


Performance Features

      • Agency approved
      • 50/60Hz independent operation
      • Serial communication with Modbus™ RTU protocol
      • On-board heater bakeout and control diagnostics
      • Electrically touch-safe package
      • Models 65 through 250 amp ratings
      • Up to 660V~(ac)
      • Microprocessor-based technology
      • Snap-fit on pre-mounted plate
      • Heater & control diagnostics capabilitie
      • Multizone capability




QPAC SCR  ControllerWatlow's modular QPAC Series SCR power controller features plug-in flexibility in 1-phase, 3-phase, 2-leg, and 3 phase, 3 leg.


A variety of transformers allows the QPAC to operate virtually anywhere in the world.


Performance Features

      • Available in ratings from 150-1000 amps
      • Ambient operating temperatures 0° to 50° (32° to 122° F)
      • Completely modular power controller
      • Burst firing, solid state contactor and phase-angle firing modes
      • High speed semiconductor fuses and RC snubbers
      • High capacity heatsinks for 50° C (122° F) ambient operation
      • Open heater or shorted SCR detector option
      • Standard models up to 300 amps
      • Agency approvals


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