The MaxPac Series is specifically designed for the OEM market. The plug-in options, flexible I/O power wiring, space saving footprint, optional lug kits, I2t fusing and universal approvals make it an excellent candidate for your product.

Chromalox’s exclusive DOT (Demand Oriented Transfer) firing switches the fewest number of cycles to provide the most precise zero crossover control. At 50% output the unit’s output alternates between three electrical cycles on and three cycles off. At 51% the output continues with three cycles on / three cycles off and gradually integrates three extra “on” cycle for the additional one percent. With the exception of phase angle firing, DOT firing is the most precise method of SCR control. DOT firing is preferred in many applications because phase angle firing creates unwanted RFI. DOT is excellent for applications where consistent heater/process temperature control is critical.

MaxPac I - Single Phase SCR Power Pak

The Chromalox Model MaxPac I Single Phase Solid State SCR Power Controller is a highly versatile power pak with optional plug-in Shorted SCR Detection Boards. Firing modes can be switched between On/Off and proportional Zero Cross or DOT Firing power control at any time based on process needs.

MaxPac II - Three Phase, 2 Leg SCR Power Pak

The MaxPac II is a Solid State, highly versatile power pak with optional plug-in proportional Firing and Shorted SCR Detection Boards. Firing techniques include: “ON/OFF Power Control” (Contactor) and “Proportional Power Control” (Zero Voltage Switching, DOT fire).

MaxPac III - Three Phase, 3 Leg SCR Power Pak

The Chromalox Model MaxPac III is a Solid State, highly versatile power pak with optional plug-in proportional Firing and Shorted SCR Detection Boards. Firing techniques include: “ON/OFF Power Control” (Contactor) and “Proportional Power Control” (Zero Voltage Switching, DOT fire). 

The MaxPac Viewer Configuration Software allows users to program a variety of parameters and settings into their MaxPac I, II, III and MiniMax I, II, and III power controllers. Power management, alarm monitoring, firing mode, and cycle time adjustment are just a few of the settings available. The software also has a service platform for troubleshooting and maintenance on the spot.   

(Note: New configuration software releases occur without notice. If you need to update your release, you must first uninstall your current version prior to installing the latest release. This may be done in Programs and Features located in the Windows Control Panel.)

Controls Overview
Controls SCR Selection Guide
Controls Design Guide Analog Maxpac Installation Manual  Digital Maxpac Installation Manual Max Pac Viewer Manual

MaxPac I Single Phase SCR Power Pak

MaxPac I Catalog Page

MaxPac II Three Phase, 2 Leg SCR Power Pak

MaxPac II Catalog Page

MaxPac III Three Phase, 3 Leg SCR Power Pak

MaxPac III Catalog Page