Inverter 251-Ultra


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Features and Advantages

  • Digital inverter technology.
  • Excellent arc characteristics and outstanding performance for rutil and basic electrode types.
  • Ideal for welding of carbon and low-alloy steels, even stainless steels.
  • 380V-3Ph input voltage and maximum output current of 250 A provide a continuous welding operation with electrodes in diameters of 2.5, 3.2 and 4.0 mm.
  • Hot-Start feature allowing the welder to increase the welding current at the start of the electrode.
  • Arc-Force to prevent freezing the electrode in the welding puddle.
  • Suitable for operation on site or within a workshop environment by providing maximum flexibility.
  • 21.5 kg weight.
  • Digital ampermeter.
  • Fan cooling.
  • Thermostatic overload protection and indicator light.
  • Easy-to-use and user-friendly control panel.
  • Recessed controls and connections designed to help protect controls from damage.
  • Two quarter-turn (positive and negative) output terminals for easy cable connection.
  • IP21S protection class.
  • Meet EN60974-1 and CE standards for safety and reliability.
  • Two years warranty on parts and labor.

Arc-Force and Hot-Start

Arc-Force gives a power source variable additional amperage during low voltage (short-arc-length) conditions while welding. Helps avoid "sticking" stick electrodes when a short arc length is used.
Hot-Start used on Inverter 251-Ultra makes it easier to start difficult-to-start electrodes and used for arc starting only.

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Control Panel and Functions

Kontrol Paneli

Technical Properties

Inverter 251-Ultra
Input Voltage : 380 V
50/60 Hz
Power Input @ Rated Output : 13 kVA (35%)
Input Current (Max) : 20 A (35%)
15 A (100%)
Rated Output Current,
Voltage and Duty Cycle
: 250 A ; 30,0 V (35%)
190 A ; 27,6 V (60%)
150 A ; 26,0 V (100%)
Open Circuit Voltage
: 80 V (DC)
Current Range : 10 - 250 A
Fuse Size and Type
: 20 A (retarded)
Protection Class : IP21S
Cooling System
: Fan cooling
Weight (Without Cables) : 21,5 kg
Dimensions (WxHxD) : 240 x 440 x 500 mm
Compliance : EN 60974-1 ; CE

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