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The TERRA NX 400 TLH is a simple and reliable three-phase power source for TIG DC and electrode welding. Arc generation is based on tried and tested inverter technology, and dimensions are particularly compact thanks to the Three-Level® power platform. This power source incorporates a VRD (voltage-reduction-device) to reduce no-load voltage in hazardous environment.

  • Three-phase 3x400V
  • Inverter technology
  • Easy transport with the specific trolley
  • 4 proprietary welding processes by Böhler Welding
  • 400A@60% (40 °C)
  • 22.5 kg
  • General
    Welding processs TIG DC HF - TIG DC Lift - MMA
    Materials Carbon steels - Stainless Steels - Cast irons - Copper - Titanium
    Dimensions 620x240x460mm
    Weight 20.5 kg
    Power supply 
    Voltage (50/60 Hz) 3x400V±15%
    Maximum input power 15.9 kVA
    Maximum input current 23.2A 
    Efficiency 88%
    Slow blow line fuse 25A
    Open circuit voltage 61Vdc
    IP protection rate  IP23S
    Insulation class H
    Power supply cable 4x2.5mm2 - 5 m
    Adjustment range 3A-320A
    Duty cycle
    TIG - 40 °C
    60% - 320A
    100% - 280A
    Duty cycle
    TIG - 25 °C
    70% - 320A
    100% - 290A
    U/D TIG Torch compatible
    Remote control compatible 
    • Medium-heavy job shop fabrication
    • Boiler and tank construction
    • Plants machinery construction
    • Automobile industry
    • Cycle industry
    • Nuclear industry
    • Military industry
    • Aeronautics and Aerospace industry
    • Food industry
    • Chemical industry
    • Repair and overhaul
    • Pipeline construction
    • Workshops
    • New generation inverter technology power source (Selco patented 3-level technology)
    • Heavy duty and enviromental conditions, high service life
    • CAN fieldbus digital communication protocol system (very high speed and high reliability digital communication)
    • Software based controls can be upgraded as new features become available
    • Extremely rugged, reliable and easy-to-use systems
    • High temperature, shockproof, abrasion resistant plastic case
    • Air flow ducting and fully encapsulated PC board to avoid dust contamination
    • Power source trolley for easy system manoeuvrability
    • Full digital and user-friendly control panel
    • Welding parameters digital display
    • Last job settings auto-storage at switch-off
    • Lock-unlock function key protected by password
    • Ideal for stick welding with multiple types of popular electrodes
    • Built-in adjustable arc control features (hot start, arc force, antisticking)
    • Synergic setting for optimal stick welding with all types of electrodes
    • Trigger of the arc in HF mode
    • Manual restart or downslope stop functions
    • Bi-Level operating mode
    • Pulsed and fast pulsed operating mode (2500Hz)
    • Easy joining
    • Current socket (panel) 50/70mm²
    • Up/Down torch compatible (welding current adjustment)
    • Remote control compatible
    • WU cooling unit compatible
    • Controlled cooling operations