Chromalox CFW Advanced Modular SCR Power Controller


  • 40A - 600A Models Available
  • 480Vac, 600Vac, and 690Vac Options
  • 1P, 3P 2-Leg, or 3P 3-Leg
  • 100KA SCCR Rating
  • Zero Cross (Fixed Cycle, Burst Fire, Half Single Cycle) and Phase Angle Firing Capability
  • Current Limiting
  • Multiple Analog Input Options Including 0-5V, 0-10V, 0-20mA, 4-20mA, PWM and Potentiometer
  • Analog Retransmit
  • V, V2, I, I2, P Feedback Control
  • Built In Fusing
  • Total and Partial Interrupted Load Alarm
  • Default Modbus RS-485 Communications
  • Communication Expansion Slot Capable of Profibus, Modbus TCP/RTU, Realtime Ethernet IP, EtherCat, CanOpen, ProfiNet
  • Add On Keyboard For Programming and Monitoring
  • Optional Built In PID Control
  • C-PWR PC Configuration Software
  • SCR Overtemperature and Shorted SCR Alarm
  • UL, cUL, & CE Markings


Thermal Devices is an authorized Chromalox distributor and is proud to offer the full line of Chromalox CFW Advanced Modular SCR Power Controllers. The CFW Advance Modular SCR Power Controller offers single phase, three phase 2-Leg, or three phase 3-Leg power control from 40A to 600A. All models feature Zero Cross and Phase Angle firing capability making the CFW extremely versatile in the industry. Multiple input options are featured, including 0-5V, 0-10V, 0-20mA, 4-20mA, PWM, and 1Kohm to 10Kohm potentiometer signal. Programmable analog outputs are included to allow retransmission of critical process details.

Contact a Thermal Devices’ Sales Engineer for more information! Or, request a quote.

Product Description


Modbus RTU/RS485 communications are outfitted by default, but with PLC’s and integrated networks being commonplace, the CFW can host a number of additional fieldbus communications including Modbus TCP, Profibus, ProfiNet, Ethernet IP, DeviceNet, EtherCat, and CANopen. Each of these fieldbus cards can be installed at time of order or outfitted at a later date. This makes it extremely easy to adapt the CFW to any host network.

Complete Process Control Package

In addition to the integration of PID control and power control, the CFW offers a full suite of diagnostic and monitoring capabilities to make this the most versatile controller Chromalox has to offer. Full thermal and electrical monitoring allows users to anticipate failures and malfunctions so corrective steps can be taken in a timely manner.

With each zone outfitted with an independent current transformer, full diagnostics can be performed from loop break alarm, heater break, SSR short circuit, input opening or short circuit, and even over temperature alarm.