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

A variety of transformers from 120 to 575V~(ac) along with 50/60 Hz operation enable the QPAC to operate in applications anywhere. Plug-in control cards set the QPAC's SCR firing modes; solid state contactors, burst firing (zero cross) or phase-angle models are available with a wide variety of options. High speed fuses are included to protect the SCR from short circuit currents.

FEATURES AND BENEFITS:
  • Modular power controller - Unit base can be fitted with a variety of plug-in transformers and control cards
  • Available in 150 to 1000 amp ratings - Can handle large or small loads
  • Available in solid state contactor, burst firing (zero cross) or phase-angle fired mode - Meets most application requirements
  • Rugged design for 50°C (122°F) ambient operation - Full rating of the power controller can be used in industrial applications
  • Semiconductor fuses and snubber protection included - Protects SCR from voltage or current surges or spikes
  • Open heater or shorted SCR detector option - Diagnostic capabilities
  • UL®508 listed and C-UL® up to 1000 amps - For applications requiring agency approvals.
  • 3-Year Warranty - Total customer satisfaction

    Download Watlow QPAC Power Controller Brochure (pdf 134K)

    Download Watlow QPAC Power Controller User Manual (pdf 505K)

Watlow QPAC Solid State Power Controller Ordering
To order, complete the code number below by selecting the options desired in each category. Then click the "submit" button.
The part number and price will be displayed on the next page.


Q __ __ - __ __ __ - __ __ __ - __ __ __
1 2 3
4 5 6
7 8 9
10 11 12
1. Series QPAC
Price
Q = QPAC - Modular solid state power controller; phase angle to zero cross; fuse(s) and holder(s) included.

2-3. Phase (choose 01, 32 or 33)
01 = 1 phase, 1 controlled leg
NC
32 = 3 phase, 2 controlled legs
NC
33 = 3 phase, 3 controlled legs
NC

4-5. Operating and Output Voltage (choose 12, 20, 24, 27, 38, 41, 48 or 57)
12 = 120V~(ac)
NC
20 = 208V~(ac)
NC
24 = 240V~(ac)
NC
27 = 277V~(ac)
NC
38 = 380V~(ac)
NC
41 = 415V~(ac)
NC
48 = 480V~(ac)
NC
57 = 575V~(ac)
NC

6. Cooling Fan Voltage (choose 1 or 2) - customer to supply wiring and hook-up
1 = 120V~(ac)
NC
2 = 240V~(ac)
NC

7-9. Output Current Amps (choose 150, 200, 300, 400, 500, 600, 800, 01K) - see pricing chart below.
150 = 150 amps
200 = 200 amps
300 = 300 amps
400 = 400 amps
500 = 500 amps
600 = 600 amps
800 = 800 amps
01K = 1000 amps

Amps
Q01
Q32
Q33
Up to 480V 575V Up to 480V 575V Up to 480V 575V
150
$1,839
$2,022
$2,827
$3,107
$4,067
$4,474
200
$2,022
$2,230
$3,196
$3,518
$4,310
$5,003
300
$2,166
$2,382
$3,746
$3,122
$5,145
$5,623
400
$3,243
$3,551
$5,509
$6,060
$8,556
$9,554
500
$3,309
$3,633
$5,686
$6,254
$8,843
$9,725
600
$3,423
$3,763
$5,864
$6,449
$9,087
$9,995
800
$4,445
$4,887
$7,817
$8,602
$11,897
$13,088
1,000
$5,864
$6,449
$10,661
$11,723
$16,288
$17,916

10-11. Input Control Card (choose CA, CD, BF, BV, AF or AL)
CD = Zero crossed contactor -(dc) input
$124.00
BF = Zero crossed, fixed time base - calibrated for 4-20mA-(dc) input unless specified by customer
$172.00
BV = Zero crossed, variable time base - calibrated for 4-20mA-(dc) input unless specified by customer
$162.00
AF = Phase angle fired - calibrated for 4-20mA-(dc) input unless specified by customer.
Not available with Q32 models.
$172.00
AL = Phase angle fired with current limit - calibrated for 4-20mA-(dc) input unless specified by customer
Includes one current transformer (CT) and one interstage transformer for 1-phase. Add $75.00 for second CT required for 3-phase. Not available with Q32 models.
$346/$426

12. Open Heater/Shorted SCR Detector (choose 0, 1 or 2) - for zero cross options only.
0 = None
NC
1 = 1-phase operation (includes one CT and interstage transformer)
$278.00
2 = 3-phase operation (includes two CTs and interstage transformer)
$360.00

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