Watlow, a designer and manufacturer of electric heaters, controllers and temperature sensors, has been notified that the UL® 508 listing on its QPAC SCR (Silicon Controlled Rectifier) power controllers has been extended to include select models of 400-1000 amperes. This enhancement extends the UL® 508 listing to QPAC models Q01 and Q32 with 400-1000 amperes outputs up to 480 volts. The QPAC product line was previously listed only through 300 amperes.

The UL® 508 listing eliminates or greatly reduces the costly load and temperature rise testing of an industrial electrical cabinet. A UL® 508 listed product can be installed in a UL® 508 listed cabinet without any additional testing, which saves significant agency testing and approval fees.

Watlow's QPAC is a modular 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 575 volts along with 50/60Hertz operation enable the QPAC to operate in applications anywhere. Plug-in controller cards set the QPACs 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.

QPAC applications include furnaces and ovens, petrochemical, heat treating and environmental chambers.

About Watlow
Since the company's founding in 1922, Watlow has brought its thermal expertise to numerous applications, including semiconductor, power generation, plastics processing, foodservice equipment, life sciences, aerospace and others. Headquartered in St. Louis , Mo., Watlow is the largest custom designer and manufacturer of industrial heaters, sensors, controllers and software with offices and manufacturing facilities worldwide.

Courtesy of  Watlow