Description
The Royce MMA-300S (Item No. RAC-300 / MMA-300S) is a lightweight, compact inverter stick welder designed for light-to-medium steel fabrication, workshop maintenance, and job-site repairs.
Core Technical Specifications
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Welding Technology: Advanced IGBT Inverter with PWM closed-loop control.
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Input Voltage: Single Phase 220V–230V AC (50/60 Hz).
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Input Capacity: Approx. 8.7 KVA.
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Current Output Range: 20A to 300A (adjustable via digital display).
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Usable Electrode Sizes: $1.6\text{ mm}$ to $4.0\text{ mm}$ (supports basic, rutile, and stainless steel electrodes).
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Duty Cycle:
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100% duty cycle under normal ambient temperatures.
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60% duty cycle at maximum output (40°C).
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Efficiency Rating: ~85% power conversion efficiency.
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Protection Systems: Automatic thermal overload protection and forced air cooling fan.
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Dimensions & Portability: ~31 × 20 × 13 cm, featuring a top carrying handle and shoulder strap.
Key Features
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Built-in Hot Start & Arc Force: Minimizes electrode sticking upon initial arc ignition for smoother bead creation.
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Energy Efficient: Inverter conversion reduces idle power draw and overall electricity consumption compared to traditional transformer welders.
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High Portability: Significantly lighter and smaller than 400A models, making it easier to carry up ladders or around tight job sites.
Included Accessories (Standard Package)
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Electrode Holder with welding cable & quick dinse connector.
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Earth Clamp with ground cable.
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Handheld face shield / welding mask.
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Wire brush & slag hammer combo.
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