Royce 250S Inverter Heavy Duty Welding Machine

The Royce MMA-250S (often referred to as the RAC-250 or Mini-250S) is the slightly lighter, more compact sibling to the 300S. It is designed primarily for light-to-medium fabrication, field repairs, and workshop DIY projects where extreme 5.0 mm heavy-industrial rod burning isn’t constantly required.

Key Technical Specifications

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

• Technology: Advanced IGBT Inverter with PWM control (smooth arc performance)

• Current Range: 20A to 250A (Adjustable via front knob dial)

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

• Rated Input Capacity: ~8.7 kVA

• Usable Electrode Size: Optimized for 1.6 mm to 4.0 mm welding rods (can strike a 5.0 mm rod briefly, but runs best on 2.5 mm and 3.2 mm rods like the standard gauge 10 or 12).

• Efficiency: 85% energy efficiency with a stepless lower power consumption footprint.

Duty Cycle & Protection

• Duty Cycle: * 100% under typical ambient room temperatures at moderate amperages.

  • 60% duty cycle when pushed near its peak 250A limit or working in hot conditions (up to 40°C).

• Protection Rating: IP21 insulation grade featuring built-in automatic thermal overload protection and anti-stick safety.

Physical Build & Portability

• Weight: Exceptionally light, usually weighing between 2.0 kg and 4.0 kg (depending on the exact mini enclosure variant). This makes it significantly easier to carry up ladders or on rooftops than the 300S.

• Display: Includes a clear digital front LED display to monitor real-time current output.

• Portability: Comes with a top handle and shoulder strap loops.

Standard Box Inclusions

1. Royce 250S Inverter Machine

2. Earth clamp with cable

3. Electrode holder clamp with cable

4. Basic wire cleaning brush/chipping hammer

5. Basic hand shield / dark glass mass