Miller Electric Spectrum 625 X-TREME

Est. $2,000 - $5,000 Specs verified 2026-10-03 · millerwelds.com Updated 2026-10-03

Key Specifications

rated output

120 (15 A): 20 A at 88 VDC, 60% duty cycle; 120 V (20 A) 27 A at 91 VDC, 35% duty cycle; 240 V: 40 A at 140 VDC, 60% duty cycle

input voltage

110/115/120 V, 220/230/240 V

input hz

50/60 Hz

max thickness mild steel

5/8 in. (15.9 mm)

max thickness stainless steel

1/2 in. (12.7 mm)

max thickness aluminum

3/8 in. (9.5 mm)

How much does the Miller Electric Spectrum 625 X-TREME cost?

Estimated price range

Est.$2,000 - $5,000

Our best estimate for a cnc plasma cutting in this class — not a quote from Miller Electric. Configuration moves it a long way.

Overview

The Miller Electric Spectrum 625 X-TREME is a portable plasma cutting power source: 21 lb., 13.25 in. long, 5.5 in. wide and 9 in. high, with a top rated output of 40 A at 140 VDC. Miller lists a maximum cut thickness of 5/8 in. (15.9 mm) on mild steel, 1/2 in. (12.7 mm) on stainless steel and 3/8 in. (9.5 mm) on aluminum.

What the unit delivers depends on the outlet it is plugged into. Input voltage is listed as 110/115/120 V or 220/230/240 V at 50/60 Hz. On 240 V the rated output is 40 A at 140 VDC with a 60% duty cycle. On a 120 V, 20 A circuit it drops to 27 A at 91 VDC and the duty cycle falls to 35%. On a 120 V, 15 A circuit it is 20 A at 88 VDC, again at 60%. The full output is therefore available only on the higher voltage; a 15 A household-type circuit gives half of it.

The travel speed rows give 15 IPM for mild steel, stainless steel and aluminum alike. That is a slow, steady pace, and the table offers no faster figure for thinner stock. A 60% duty cycle means six minutes of cutting in every ten at rated output, which suits intermittent work more than long continuous runs.

Beside the Spectrum 875 the difference in bulk is plain: 21 lb. here against 48 lb. for the larger unit. The table has no rows for air supply, torch or CNC interface, so anyone planning to mount this unit on a cutting table should confirm those points with Miller for the exact package being ordered.

Full Specifications

Parameter	Value
Rated Output	120 (15 A): 20 A at 88 VDC, 60% duty cycle; 120 V (20 A) 27 A at 91 VDC, 35% duty cycle; 240 V: 40 A at 140 VDC, 60% duty cycle
Input Voltage	110/115/120 V, 220/230/240 V
Input Hz	50/60 Hz
Max Thickness Mild Steel	5/8 in. (15.9 mm)
Max Thickness Stainless Steel	1/2 in. (12.7 mm)
Max Thickness Aluminum	3/8 in. (9.5 mm)
Travel Speed Mild Steel	15 IPM
Travel Speed Stainless Steel	15 IPM
Travel Speed Aluminum	15 IPM
Net Length	13.25 in.
Net Width	5.5 in.
Net Height	9 in.
Machine Weight	21 lb.

Specifications sourced from millerwelds.com — verified 2026-10-03

Strengths & Limitations

Strengths

Weighs 21 lb. in a case 13.25 in. long, 5.5 in. wide and 9 in. high, less than half the 48 lb. of the Spectrum 875
Accepts 110/115/120 V or 220/230/240 V input at 50/60 Hz
Rated 40 A at 140 VDC with a 60% duty cycle on 240 V
Maximum cut thickness of 5/8 in. (15.9 mm) on mild steel and 1/2 in. (12.7 mm) on stainless steel
Still delivers 20 A at a 60% duty cycle from a 120 V, 15 A circuit

Limitations

On a 120 V, 20 A circuit the output is 27 A at 91 VDC and the duty cycle falls to 35%
Aluminum is limited to 3/8 in. (9.5 mm)
Listed travel speed is 15 IPM on mild steel, stainless steel and aluminum, a slow pace for production cutting
The table has no rows for a CNC interface, air supply or torch, so its fit on a cutting table has to be confirmed separately

Best For

Cutting jobs where a 21 lb. unit has to be carried to the work Sites with only 120 V outlets, at a reduced output of 20 A or 27 A Mild steel up to 5/8 in. (15.9 mm) and stainless steel up to 1/2 in. (12.7 mm) Aluminum sheet and plate up to 3/8 in. (9.5 mm)

Frequently Asked Questions

01 How thick can the Spectrum 625 X-TREME cut?

Miller lists a maximum thickness of 5/8 in. (15.9 mm) on mild steel, 1/2 in. (12.7 mm) on stainless steel and 3/8 in. (9.5 mm) on aluminum. The travel speed listed for each of the three materials is 15 IPM.

02 Can the Spectrum 625 X-TREME run on a 120 V outlet?

Yes, at reduced output. On a 120 V, 15 A circuit the rated output is 20 A at 88 VDC with a 60% duty cycle. On a 120 V, 20 A circuit it is 27 A at 91 VDC with a 35% duty cycle. The full 40 A at 140 VDC needs 240 V input.

03 What is the duty cycle of the Spectrum 625 X-TREME?

It depends on the input. The rating is 60% at 40 A on 240 V, 35% at 27 A on a 120 V, 20 A circuit and 60% at 20 A on a 120 V, 15 A circuit. At 60% the unit is rated to cut for six minutes in every ten.

04 How big and heavy is the Spectrum 625 X-TREME?

The net dimensions are 13.25 in. long, 5.5 in. wide and 9 in. high, and the weight is 21 lb. For comparison, the Spectrum 875 weighs 48 lb., so the 625 X-TREME is the easier of the two to move between jobs.