WELDMAN GRAND 500 Rectifier with Start-Up – 500A MMA Welder, 3-Phase 400V, Jump Start 12V/24V

Heavy-duty welding and vehicle recovery demand a power source that won't quit under load. The WELDMAN GRAND 500 Rectifier with Start-Up delivers exactly that: a robust thyristor-based MMA welder with an integrated 12V/24V jump start function, built for professional industrial use, heavy construction, and demanding repair work.

Who is it for

Professional welders, maintenance crews, and workshops that need a reliable, high-output machine for thick materials and frequent use. Its jump start capability makes it equally valuable for fleet operators and agricultural settings where dead batteries are a daily reality.

Main features

• MMA welding with current range 60–500 A for electrodes up to 8.0 mm
• Three-phase 400 V input for stable arc performance and high duty cycle
• 60% duty cycle at 500 A – weld longer without overheating
• Integrated jump start function for 12 V and 24 V batteries, peak current 500 A
• Hot Start, Arc Force, and Anti Stick technologies for smoother arc control
• Fan-cooled, IP21S protection, insulation class H for harsh environments

Specifications

• Welding process: MMA (Manual Metal Arc)
• Input voltage: 3 x 400 V, 50/60 Hz
• Open circuit voltage: 65 V
• Max power consumption: 25 kVA
• Jump start effective current: 60 A
• Recommended battery capacity for charging: 60–800 Ah
• Protection class: IP21S, insulation class H
• Cooling: fan-cooled
• Technology: thyristor-based rectifier

Tips

For best results with thick electrodes, ensure your input supply can handle the 25 kVA peak. When using the jump start function, always connect the clamps securely and follow the vehicle manufacturer's guidelines to avoid damage to sensitive electronics.