Key facts
- Brand
- Kemppi
- Model
- FastMig KM 300
- Documents
- 8
- Languages
- EN · RU · DE · IT · SV · FI
- Last added
- 2026-10-16
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Kemppi FastMig KM 300/400/500 Operating Manual
This document serves as the operating manual for the Kemppi FastMig KM series of three-phase MIG welding power supplies. It provides comprehensive instructions on installing the unit, including positioning requirements and electrical connections for the mains and welding cables.
The guide details how to operate the control panel, adjust parameters such as wire feed speed and arc dynamics, and interpret indicator lamps. It also includes a troubleshooting section for common errors like overload or phase loss, along with maintenance procedures and technical specifications.
Kemppi FastMig KM 300 specifications
| Fuse rating (KM 300) | 20 A inert |
|---|---|
| Fuse rating (KM 400) | 25 A inert |
| Fuse rating (KM 500) | 35 A inert |
| Recommended cable cross‑section (KM 300) | 50–70 mm² |
All Kemppi FastMig KM 300 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
- Kemppi FastMig KM 300/400/500 Operating Manual 18 p
- Kemppi FastMig KM 300, 400, 500 Operating Manual 16 p
- Kemppi FastMig KM 300, 400, 500 Operating Manual 17 p
- Kemppi FastMig KM 300, 400, 500 Operating Manual 17 p
- Kemppi FastMig KM 300, 400, 500 Operating Manual 18 p
- Kemppi FastMig KM 300, 400, 500 Operating Manual 17 p
- Kemppi FastMig KM 300, 400, 500 Operating Manual 18 p
- Kemppi FastMig KM 300, 400, 500 Operating Manual 18 p
Questions answered in these manuals
What is the minimum required free space in front of and behind the machine for air circulation?
There must be at least 20 cm of free space in front and behind the machine to ensure cooling air circulation.
How long can the cooling fan run after welding stops depending on the machine temperature?
The cooling fan may continue to run for up to 10 minutes after welding is finished, depending on the machine temperature.
What are the fuse ratings for each KM model?
KM 300 uses a 20 A inert fuse, KM 400 uses a 25 A inert fuse, and KM 500 uses a 35 A inert fuse.
What is the safety class of the FastMig KM 300, 400, 500?
The safety class is IP23S, which allows storage and use in dry environments but not operation in rain.
What are the fuse ratings for each model?
KM 300: 20 A (slow), KM 400: 25 A (slow), KM 500: 35 A (slow).
What are the fuse ratings for the FastMig KM 300, 400, and 500?
KM 300: 20 A treg, KM 400: 25 A treg, KM 500: 35 A treg.