Combined protection unit for welding transformer KZUST

photo_protection_welding_transformerCombined protection unit for welding transformer ensures a safe, energy-saving and comfortable AC welding process.



Main functions:

  • Limitation of welding transformer no-load voltage to 6V and less.
  • Contactless disconnection of welding transformer from the network 1 second after arc disruption.
  • Stable full voltage supply into the welding circuit after the electrode contacts the welded piece.


  • Ensures electrical safety during welding in hazardous areas, helps welders and people in welding area avoid electric shocks in case of an accidental contact with live parts of the welding circuit or during electrode replacement.
  • Allows for saving active and reactive power.

Rated supply voltage, V 1АС 220, 380, 500* (+10% / -10%), 50 Hz
Rated welding current, A up to 500
Maximum welding current, A up to 630
Limited voltage on welding electrode, V not exceeding 6
Time delay of no-load voltage supply after arc disruption, sec 1 ± 0,01
Time of full voltage supply after the electrode contacts a welded part, sec not exceeding 0,01
Welding circuit resistance at which welding mode is changed, Ohm 200
Operation mode 60% duty cycle
Operating ambient temperature, °С from -40 to +45
Environment Application is allowed in dusty and humid environment
Protection class IP53
Dimensions (H х W х D), mm 330 х 180 х 165
Weight, kg 10

Each manufactured device is fully tested on a special test stand before putting into operation.

Guaranteed service life is 12 months from putting into operation, but no longer than 18 months from delivery date.