How Many Amps Does a MIG Welder Use?
MIG Welder draws about 17 amps at 240 volts (4,000 watts running). MIG Welder runs on its own dedicated 240 V circuit — plan on a 20-30 A breaker per the welder's nameplate (often installed on a 50 A NEMA 6-50 circuit).
Amps = watts ÷ volts. Enter the wattage from your appliance's nameplate or label for an exact figure.
Current draw — a MIG welder
17 A
- At 240 V
- 4,000 W
This appliance's circuit is sized from its nameplate per the NEC, not from wattage — see the circuit guidance below.
MIG Welder amperage at 120 V and 240 V
Same 4,000 W load — the current halves when the voltage doubles. MIG Welder is typically a 240 V appliance in US homes.
| Draw | Watts | Amps at 120 V | Amps at 240 V |
|---|---|---|---|
| Running | 4,000 W | 33 A | 17 A |
Breaker and circuit for a MIG welder
MIG Welder runs on its own dedicated 240 V circuit — plan on a 20-30 A breaker per the welder's nameplate (often installed on a 50 A NEMA 6-50 circuit). Welder circuits are sized from the nameplate and duty cycle under NEC Article 630, not steady wattage.
Guidance only — actual circuit sizing depends on your unit's nameplate, wire run length, and local code. Confirm with a licensed electrician. See the wire & breaker size chart for the full NEC ampacity table.
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