Automatic Electrolytic Capacitor Former

M3628ACF Automatic Capacitor Former

The M3628ACF 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 M3628ACF is a portable digitally-controlled electrolytic 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.

RoHS Compliant


  • Forms, Charges, discharges, measures, and tests electrolytic capacitors
  • Variable output voltage: 0 - 1000 VDC
  • Digital voltage and current displays
  • Portable - case on wheels
  • Operates from standard 120 or 240 VAC supply


  • Automatically steps through voltage settings. No manual adjustment needed.
  • Accurate electrolytic capacitor measurement
  • Easily reforms electrolytic 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 electrolytic capacitors
  • Decreases maintenance time and cost
Model Number Input Voltage Max Output Voltage Max Output Current Max Load Capacitance
M3628ACF-Y01-120 110-120 VAC 1000 VDC 0-1 ADC 300,000µF
M3628ACF-Y01-240 220-240 VAC 1000 VDC 0-1 ADC 300,000µF
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