KEMPACT 251A POWER SOURCE
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Kemppi Kempact 251A — Compact Single-Phase MIG/MAG Welder (250 A)
The Kemppi Kempact 251A is a compact single-phase MIG/MAG welder delivering 250 A from a 240 V supply. Features an Adaptive control panel with synergic programs, plate thickness auto-set, GasMate™ chassis, and 10%+ energy savings. Ideal for workshops, vehicle repair, and thin sheet fabrication.
What Is the Kemppi Kempact 251A?
The Kemppi Kempact 251A is a compact single-phase MIG/MAG welder delivering up to 250 A of welding output from a standard 1-phase 240 V power supply. Part of the Kempact RA series, the 251A features an Adaptive (A) control panel that automatically sets welding parameters based on plate thickness — making it an ideal choice for workshops, tradespeople, and automotive professionals who need fast, accurate set-up without manual calculation.
Key Features of the Kemppi Kempact 251A
Adaptive (A) Control Panel The 251A's standout feature is its Adaptive control panel, which provides synergic welding programs for mild steel, silicon bronze, flux-cored wire, and metal-cored wire. Welders simply select the plate thickness, wire size, and gas type — and the machine automatically configures the optimal welding parameters. Four memory channels allow frequently used settings to be saved for instant recall.
Synergic Programs for Multiple Wire Types Pre-loaded synergic programs cover a wide range of common filler materials including mild steel (Fe solid), silicon bronze, flux-cored (Fe cored), and aluminium — supporting versatile workshop and fabrication applications without manual program configuration.
GasMate™ Chassis Design The floor-level gas cylinder loading design simplifies cylinder handling, transport, and storage, reducing the physical effort and safety risks associated with managing shielding gas in a workshop environment.
Brights™ Cabinet Lighting Integrated cabinet lighting illuminates the wire loading area, enabling accurate wire threading even in dimly lit environments or after-hours workspaces.
WireLine™ Service Alert The WireLine™ indicator proactively alerts operators when wire-path maintenance is needed, supporting consistent wire feeding performance and reducing unplanned service interruptions.
HotSpot™ Heat Treatment Function HotSpot™ offers four adjustable heat settings for localised metal shrinking, component heating, and releasing corroded fasteners. A carbon electrode attached to the FE welding gun activates a controlled surface heating circuit — purpose-built for vehicle repair and precision thin-sheet work.
Single-Phase Convenience Running on a standard 240 V single-phase supply, the 251A can be deployed in workshops, garages, and job sites without requiring 3-phase infrastructure — maximising flexibility and portability.
Energy Efficiency The 251A's modern inverter platform reduces energy costs by more than 10% compared to conventional step-controlled power sources, delivering cost savings across day-to-day welding operations.
Who Is the Kemppi Kempact 251A For?
The Kempact 251A is designed for:
- Automotive and vehicle repair workshops needing precise thin-sheet MIG/MAG welding
- Light fabrication and panel shops requiring versatile single-phase welding with adaptive set-up
- Tradespeople and contractors working from garages or sites with standard single-phase power
- Welders who prefer guided, synergic set-up rather than fully manual parameter control
- Multi-material fabricators working across mild steel, stainless, silicon bronze, and aluminium
Kemppi Kempact 251A — Technical Specifications
| Specification | Value |
|---|---|
| Product Code | 6412510 |
| Welding Process | MIG/MAG |
| Power Supply | 1-phase, 240 V ±15%, 50/60 Hz |
| Fuse (Delayed) | 20 A |
| Open Circuit Voltage | 36 V |
| Max Output (35% Duty Cycle) | 250 A |
| Control Panel | Adaptive (A) — Synergic + Auto Plate Thickness |
| Memory Channels | 4 |
| Wire Drive | 2-Roll (GT02C) |
| Wire Feed Speed | 1.0–18.0 m/min |
| Compatible Filler Wires | Fe solid, Fe cored, Stainless, Aluminium (0.8–1.2 mm) |
| Dimensions (L × W × H) | 623 × 579 × 1070 mm |
| Weight | 44 kg |
| Protection Class | IP23S |
| Operating Temperature | -20°C to +40°C |
| Standards | IEC 60974-1, IEC 60974-5 |
| Warranty | 3+ Years |
Frequently Asked Questions:
What power supply does the Kemppi Kempact 251A need? The Kempact 251A runs on a standard single-phase 240 V ±15% supply, making it suitable for domestic workshops, garages, and job sites without 3-phase infrastructure.
What is the Adaptive control panel on the Kempact 251A? The Adaptive panel automatically sets welding voltage and wire feed speed based on your selected plate thickness, wire diameter, and shielding gas. It also includes synergic programs for multiple wire types and four saveable memory channels for frequent job settings.
What materials can the Kempact 251A weld? The 251A supports mild steel (Fe solid), flux-cored wire (Fe cored), stainless steel, silicon bronze, and aluminium filler wires from 0.8 to 1.2 mm — making it one of the most versatile single-phase welders in its class.
What is the difference between the 251A and 251R? Both models deliver 250 A from a single-phase 240 V supply. The 251A has an Adaptive panel with synergic programs and auto plate-thickness set-up; the 251R has a Regular (manual) panel giving direct control over voltage and wire feed speed.
What does HotSpot™ do on the Kempact 251A? HotSpot™ uses a carbon electrode to apply controlled, localised heat to metal surfaces. It is used for metal shrinking, panel straightening, component heating, and releasing corroded nuts and bolts — particularly valuable in automotive repair applications.
Is an argon regulator included with the Kempact 251A? This varies by package. Some retail configurations include an argon regulator; the standard international package (6412510) includes the welding gun and earth return lead. Always confirm package contents with your local Kemppi dealer.
