VDM-6303P multioperator rectifier welding unit is designed for  furnishing the welding points of the manual arc welding with coated electrodes of the carbon and alloy steels products using the direct current. The rectifier can be also used in the steady-state conditions completed with the RB – 304, RB-306 ballast resistors. The rectifier welding unit is not regulated and has a rigid external characteristic.

The welding current regulation is made for concrete point independently using a ballast resistor.


  • simple design;

  • high reliability and life cycle of work;

  • welding current and voltage indication;

  • availability of the circuit breaker assembly;

  • operation at the temperatures – 40 °С to +50 °С;

  • easy servicing and repair;

  • N insulation class;

  • to the maximum adapted to work in the exploitation severe duties.

The rectifier welding unit is composed of the powerful line transformer, up-to-date rectifier module with the improved air cooling system. Using the up-to-date element base and materials made possible materially reduction of the weight and dimensioning specifications, to increase the product service life and duration, to improve its maintainability.

As compared to the similar multioperator rectifiers, the VDM-6303 P has the better technical and economic parameters, modern design, extended service life.

Delivery set:

Designation Quantity
VDM type multioperator rectifier arc   welding unit 1
Certificate 1
On request  
Ballasts resistors   
Communications from   

Technical characteristics

Parameter designation VDM-6303P
Supply mains voltage, V 3х380
Supply mains frequency, Hz 50
Nominal welding current, А (at DV=100 %) 630
One point nominal welding current, А 315
Number of welding points, at most 4
Coefficient of the welding points work synchronism, at most 0.5
Closed-circuit voltage, V, at most 75
Energy input, at nominal current, kVA, at most 46
Electrode diameter, mm 3 - 6
Overall dimensions (LхWxH), mm 740х610х640
Weight, kg, at most 270


Passport apparatus


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