Royce 300S MMA Welding Machine

The Royce MMA-300S (also referred to as the RAC-300S) is a portable, heavy-duty inverter welding machine popular for both professional fabrications and DIY workshop projects.

Key Technical Specifications

• Welding Process: MMA (Manual Metal Arc) / Stick Welding

• Technology: Advanced IGBT Inverter with PWM (Pulse Width Modulator) closed-loop control

• Current Range: 20A to 300A (Adjustable via front dial)

• Input Voltage: 220V–230V AC (Single Phase, 50/60 Hz)

• Input Power Capacity: ~8.7 kVA to 17.2 kVA (depending on peak load surges)

• Usable Electrode Size: 1.6 mm to 5.0 mm (Highly versatile, supports standard steel and basic aluminum rods)

• Efficiency: 85% working efficiency with low no-load loss

Performance & Duty Cycle

• High Duty Cycle: It offers a 100% duty cycle under normal ambient temperatures, meaning it can technically run continuously without overheating shutdowns. Under high-heat conditions (up to 40°C), it maintains a reliable 60% duty cycle at full amperage.

• Safety Features: Built-in protection against overheating, over-current, and voltage fluctuations.

Portability & Build

• Weight: Light and compact, weighing roughly between 4.0 kg and 5.0 kg (machine only, up to 8 kg package weight with cables).

• Physical Features: Features a clear digital LED display for accurate real-time amperage readings, an ergonomic handle, and a shoulder carrying strap.

• Dimensions: Approximately 33cm × 23cm × 16cm.

Standard Package Inclusions

When bought new, the kit typically comes packed in a carton box containing:

1. The Royce 300S Inverter Welder

2. Welding cable with Electrode Holder

3. Earth cable with Clamp

4. Wire brush with a chipping hammer back

5. Basic hand-held welding face shield

Are you looking to purchase one locally, or do you need tips on what specific rods work best with it?