M3628PCT Portable Capacitor Tester/Former Bonitron > Products > Maintenance > M3628PCT


The M3628PCT is designed for reforming and testing capacitor banks. Electrolytic capacitors undergo physical changes when stored for long periods. Depending on the ambient conditions of the storage, this can be from six months to two years. If the capacitors are rapidly taken to their rated voltage, excessive leakage current may cause them to
overheat and fail.

As capacitors age and wear, their internal chemistries change, leading to changes in their capacitance. It is important to be able to measure this capacitance, and thus estimate the remaining useful life of your capacitor bank.

The Bonitron M3628PCT is a portable digitally-controlled capacitor tester. The digital display allows the user to charge a capacitor bank to a specified voltage, and then discharge the bank. The display will then show the calculated capacitance of the bank. This product may be used for many purposes, including charging, discharging and forming of capacitors, as well as serving general DC power needs.



  • Forms, Charges, discharges, measures, and tests capacitors
  • Variable output voltage: 0 - 800 VDC
  • Digital voltage and current displays
  • Portable - case on wheels
  • Operates from standard 110 or 220 VAC supply


  • Automatically steps through voltage settings. No manual adjustment needed.
  • Accurate capacitor measurement
  • Easily reforms capacitors
  • Standard output connections
  • Overcurrent and overtemperature protection
  • Tough impact and weather resistant case


  • Measuring aging capacitors helps avoid preemptive replacement
  • Reforming capacitors can prevent catastrophic failure
  • Quick verification of stored drives
  • Reforming saves cost of purging old stock capacitors
  • Decreases maintenance time and cost
  Model Number Input
Max Output Voltage Max Output Current Min Load Capacitance Max Load
  M3628PCT-C01-110 110 - 120 VAC 800 VDC 0-1.3 ADC 2,200µF 100,000µF  
  M3628PCT-C01-220 220 - 240 VAC  
  Made in the United States of America

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