M3728 Precharge Module Bonitron > Products > Common Bus > M3728

The Bonitron M3728 DC Inrush Limiter safely precharges a drive or other capacitive loads from a DC source, such as a diode rectifier or battery bank. When the M3728 is powered off or disabled, there is no path between the source and the capacitive load. When the unit is enabled, a resistor charges the capacitive load slowly. When precharge is complete, the resistor is removed from the circuit, allowing the load to operate normally. The M3728 also has a status contact that indicates when the capacitors are fully charged; this can be wired in series with the drive enable signal for easy integration.

Additionally, care must be taken to protect battery strings, as they can be damaged by discharging them below their safe minimum voltage. Such damage often requires expensive refurbishment or replacement. In situations where M3728 is fed from a battery string, the unit can be set to disconnect the load if the battery voltage falls to a preset level.


  • Nema 1 Construction
  • Optional battery undervoltage protection
  • Controlled load disconnect
  • Self-protects from overloads
  • Allows use of diode rectifiers in case
    SCR rectifiers will not function
  • Allows use of regenerative power
    supplies without internal precharge
  Model Number Maximum Voltage Peak Current Max Load Energy Dimensions
(H x W x D)
 
  M3728-H050-010 800VDC  50 A 10kJ 16.0" x 6.0" x 9.4"  
  M3728-H175-010 800VDC 175 A 10kJ 16.0" x 6.0" x 9.4"  
  M3728-H500-010 800VDC 500 A 10kJ 16.0" x 6.0" x 9.4"  
  M3728-C050-010 900VDC 50 A 10kJ 16.0" x 6.0" x 9.4"  
M3728-C175-010 900VDC 175 A 10kJ 16.0" x 6.0" x 9.4"  
  M3728-C350-010 900VDC 350 A 10kJ 16.0" x 6.0" x 9.4"  
  M3728-Y050-010 1000VDC 50 A 10kJ 16.0" x 6.0" x 9.4"  
  M3728-Y350-010 1000VDC 350 A 10kJ 16.0" x 6.0" x 9.4"  
  Made in the United States of America
 

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