WATLOW QPAC


The QPAC modular controller from Watlow 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 configurations.

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Product Description

Product Description

A variety of transformers from 120 to 575VAC, along with 50/60Hz operation, enable the QPAC modular controller 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 and are available with a wide variety of options. High speed fuses are included to protect the SCR modular controller from short circuit currents. 200KA short circuit current rating (SCCR) prevents arc flash.

Specification Highlight

Specification Highlight

Mounting: Back Panel
Max Output: 1000A
Output Firing: Zero Cross, Phase Angle
Phase Configuration: 1 or 3
Ambient Operating Range: 0 to 50°C (32 to 122°F)
Agency Approvals: UL®, C-UL®, SCCR
Dimensions: 13 in. (330 mm) H x 6.9 in. (175 mm) W x 10.25 in. (260 mm) D
Warranty (years): 3
Features & Benefits

Features & Benefits

Features Benefits
200KA short circuit current rating (SCCR)
  • Prevents arc flash
  • Modular power controller
  • Offers a variety of plug-in transformers and controller cards
  • Available in 150 to 1000 ampere ratings
  • Handles large or medium size loads
  • Available in solid state contactor, burst firing (zero cross) or phase-angle fired mode
  • Meets most application requirements
  • Rugged design for 122°F (50°C) ambient operation
  • Can be used in industrial applications with full rating of the power controller
  • Semiconductor fuses and snubber protection included
  • Protects the SCR from voltage or current surges or spikes
  • Open heater or shorted SCR detector option
  • Performs diagnostics
  • UL® 508 listed and C-UL® up to 1000 amperes
  • Meets applications requiring agency approvals
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