ARC251iS 250A Inverter Welding Machine – Single Phase

ARC251iS
250A inverter welding machine · 230 V single phase · VRD
250 A From a Single-Phase Socket. Safe Holder Built In.

The CRUXWELD ARC251iS is a 250A inverter welding machine for the 230 V single-phase socket every workshop and site already has. An IGBT digital inverter gives a smooth, low-spatter DC arc from 10 to 250 A; a VRD switch on the back drops the holder voltage to a safe level between welds; anti-stick releases a frozen rod. It runs 1.6, 2.5 and 3.2 mm electrodes all day and 4 mm for intermittent work, on mains or on a generator. Engineered, assembled and tested in India by a GeM Registered OEM Manufacturer.

250 A
Welding current
230 V
Single phase
VRD
Safe holder
IGBT
Digital inverter
0.94
Power factor

Price, delivery & technical help — get a fast response.

Overview

Overview

The 250A Inverter Welding Machine for Single-Phase Sites and Shops

Most of the welding in India happens where there is no three-phase supply: a fabrication shop on a 230 V connection, a customer’s site board, a farm shed, a hire-fleet generator. The ARC251iS 250A inverter welding machine is built for exactly that. It draws a maximum of 7.5 kVA from a single-phase socket, compensates for mains fluctuations of ±20%, and holds a steady arc while the supply sags under other loads.

Inside is an IGBT inverter with digital current control for a stable, low-spatter DC arc, reliable ignition with rutile and basic electrodes, and anti-stick to release a frozen electrode without burning the holder. A three-digit display shows the set current; a single knob sets it. Nothing to learn, nothing to misadjust.

230 V single phase
7.5 kVA maximum draw with ±20% mains compensation; runs from a 32 A socket or a generator.
VRD on the back
Voltage Reduction Device cuts holder voltage between welds — for shipyards, refineries and damp sites.
10–250 A stepless
From 1.6 mm sheet-metal rods to 3.2 mm general-purpose rods, with 4 mm for intermittent passes.
One hand, one handle
A compact inverter case with a moulded top handle that goes up a ladder and into a car boot.
CRUXWELD ARC251iS 250A inverter welding machine – single phase, VRD

ARC251iS: 250 A single-phase inverter with VRD.
What you are looking at

Panel, Sockets, Rear Controls

ARC251iS inverter welding machine front panel – digital ammeter, indicator LEDs and current knob
1Digital front panel
Three-digit ammeter, supply and thermal-protection indicator LEDs and a single welding-current knob.
ARC251iS output sockets – + and − dinse connectors
2Brass dinse sockets
Polarity-marked + and − quick connectors: holder to + for 7018, swap for DCEN on thin sheet.
ARC251iS VRD voltage reduction device switch and mains switch on the rear panel
3VRD and mains switch
VRD on/off, illuminated mains switch, earth stud and the fitted 230 V input cable on the rear panel.

The 250A inverter welding machine sits in a steel case with moulded impact bumpers front and rear, louvred sides and forced-air cooling; class H insulation and IP23S protection for outdoor work.

Power supply

Full 250 A From a 230 V Single-Phase Socket

ARC251iS rear panel showing VRD switch, mains switch and input cable

Rear panel: VRD, mains switch, input cable.

A 250 A class used to mean three phase. The ARC251iS 250A inverter welding machine takes its full output from an ordinary 230 V single-phase supply — a 32 A socket in the shop, a site distribution board or a portable generator — because the inverter, not the transformer, sets the arc.

7.5 kVA maximum
Rated input current 32 A at full output; far less at the 100–150 A most jobs use.
±20% compensation
Automatic compensation for mains fluctuation keeps the set current steady on weak supplies and long extension leads.
Generator ready
Runs from a 10 kVA or larger genset; soft start and surge protection keep it from tripping the set.
Protected
Over-voltage, under-voltage, over-current and thermal protection with LED warning.
Operator safety

What the VRD Does — and Why Site Contractors Ask for It

An arc welder’s open-circuit voltage is what sits on the electrode holder whenever you are not welding. On a dry shop floor it is harmless; in a ship’s double bottom, a wet trench or a boiler drum it is the voltage that goes through a sweating welder lying on steel. A Voltage Reduction Device watches the output and, whenever no arc is burning, reduces the holder voltage to a safe level. The moment the rod touches the plate the full open-circuit voltage returns and the arc strikes normally.

✓Switch on the rear panel: VRD on for confined and damp work, off for ordinary shop welding
✓No change in arc behaviour — the arc strikes normally the moment the rod touches the plate
✓Meets the VRD requirement in shipyard, refinery and PSU site safety specifications
✓Helps the 250A inverter welding machine pass contractor safety audits without an external device

If your tender or safety officer asks for “VRD-equipped” welding sets, the ARC251iS qualifies as supplied.

Close-up of the VRD switch on the ARC251iS inverter welding machine

VRD switch next to the mains switch.
Set it right

Electrode and Current Guide for the ARC251iS

ARC251iS inverter welding machine with electrode holder and earth clamp

Set the current, strike, weld.
ElectrodeTypical currentUsed for
1.6 mm40 – 60 AThin sheet, auto body, repairs
2.5 mm60 – 100 ALight fabrication, 3–5 mm plate
3.2 mm100 – 150 AGeneral fabrication, 5–8 mm
4.0 mm (intermittent)150 – 200 AShort passes on heavier sections

Typical DC ranges; follow the electrode box for the exact setting. 7018 low-hydrogen, 6013 rutile, stainless and cast-iron rods all run on the ARC251iS.

Why buyers choose it

What You Get Over a Basic 250 A Inverter

250 A on single phase
Shop today, customer site tomorrow: no three-phase connection, no phase converter.
VRD included
Operator protection that many contractors must specify — built in, not bolted on.
Reliable ignition
Rutile and basic electrodes strike cleanly; a stable arc with low spatter on every run.
Anti-stick
A frozen rod is released in milliseconds, so the holder never glows.
0.94 power factor
Low running cost; runs on a 32 A single-phase breaker or a small genset.
Digital display
Set current is shown to the amp — repeatable settings for WPS work.
Applications

Where the ARC251iS Earns Its Keep

ARC251iS inverter welding machine side view

Steel case, moulded bumpers, louvred cooling.
Site fabricationShipyards & marineRefinery & plant maintenanceSteel furnitureAgricultural repairAutomotive & body shopsRental fleetsTraining institutesPipe & structural up to 8 mmHire & contractor kits

Need less? The ARC 200 is the lighter single-phase workshop choice. Need 4 and 5 mm rods all day? The three-phase ARC 300 and ARC400iS are built for it.

Scope of supply

What Arrives with the ARC251iS

✓ARC251iS 250A inverter welding machine, 230 V single phase
✓Electrode holder with welding cable
✓Earth clamp with cable
✓Mains input cable (fitted)
✓Test certificate

Longer leads, a hand shield and a carry strap are optional; the exact scope is confirmed on the quotation. See the full range on our products page.

ARC251iS inverter welding machine with holder and earth clamp – scope of supply

Machine, holder, earth clamp: ready to weld.
Why buy from CRUXWELD

Engineered in India, Supported Worldwide

45+ years of welding expertise
The ARC251iS is engineered, assembled and load tested by CRUXWELD engineers in India; our technical team answers on WhatsApp.
ISO 9001:2015
Every 250A inverter welding machine is run at full load and weld tested before dispatch.
GeM Registered OEM Manufacturer
Tender-ready documentation, VRD compliance and test certificates for government and PSU buyers.
Pan-India supply, export ready
Dispatched across India and exported; holders, clamps and cables in stock.

Specifications

Specifications

ARC251iS 250A Inverter Welding Machine — Technical Data

ParameterARC251iS
ModelARC251iS
Type250A inverter welding machine, IGBT, DC
Welding processMMA / SMAW (stick)
Input voltage230 V ±20%, single phase
Frequency50 / 60 Hz
Max input power7.5 kVA
Rated input current32 A
Open-circuit voltage65 V (reduced with VRD on)
Welding current range10 – 250 A
Welding current @ 60% duty250 A
Welding current @ 100% duty195 A
Power factor0.94
Suitable electrodes1.6, 2.5, 3.2 mm; 4 mm intermittent
Anti-stickYes
VRD (voltage reduction device)Yes, switchable
Generator compatibleYes
ProtectionOver-voltage, under-voltage, over-current, thermal
CoolingForced air
Degree of protectionIP23S
Insulation classH
Dimensions (L × W × H)455 × 202 × 372 mm
Weight (approx.)9 kg

Specifications are subject to improvement without notice; the quotation and test certificate supplied with the machine are the governing documents. Warranty terms are stated on the quotation / invoice.

Question & Answers

FAQ

250A Inverter Welding Machine — Frequently Asked Questions

Does the ARC251iS run on single phase?
Yes. The 250A inverter welding machine is designed for a 230 V single-phase supply, 50 or 60 Hz, with ±20% compensation for mains fluctuation. Its full 250 A output is available from a 32 A socket; no three-phase connection is needed.
What is VRD and when should I switch it on?
VRD (Voltage Reduction Device) lowers the voltage on the electrode holder whenever no arc is burning, and restores it the instant the rod touches the plate. Switch it on for confined, damp or elevated work — shipyards, tanks, trenches, refineries — and wherever the site safety specification requires it.
Which electrodes can it weld?
Rutile 6013, low-hydrogen 7018, stainless and cast-iron rods from 1.6 mm to 3.2 mm continuously, and 4 mm for short, intermittent passes. The 10–250 A range covers all of them.
Can I run it on a generator?
Yes. A 10 kVA or larger generator with a reasonably clean output runs the ARC251iS at full current; its soft-start and surge protection keep it from tripping the set.
What size breaker does it need?
The 250A inverter welding machine draws up to 7.5 kVA, or 32 A, at full output on 230 V, so a 32 A single-phase breaker is recommended. At the 100–150 A used for 2.5 and 3.2 mm rods the draw is much lower.
How is it different from the ARC 200?
The ARC 200 is a 200 A workshop welder. The ARC251iS adds 50 A of headroom for 3.2 mm rods at full speed and intermittent 4 mm work, and includes the VRD safety circuit for site and confined-space welding.
What is included with the machine?
The ARC251iS 250A inverter welding machine, electrode holder and earth clamp with cables, fitted mains cable and a test certificate. Longer leads and a hand shield are optional.
How do I get the ARC251iS price and delivery time?
Request a quote on this page or message +91 88008 82983 on WhatsApp with your quantity and location. You will receive a GST quotation with delivery time, usually the same working day.
Tell us your supply and electrodes — we will confirm the fit and send a quotation today.

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19 Comments

  1. The ARC 250 is the need of the hour in my company and I find the Cruxweld as attractive price with good quality.

  2. ARC 250 , CMM-ARC250i , Digital Inverter Based
    SIR YE MACHINE Genratore per chalega esaka quotation bhajie

    SIR ESAME IGBT WALA MACHINE MILEGA TO AAP UASA KIMAT BHEGIE
    AUR

  3. ARC 250 , CMM-ARC250i , Digital Inverter Based
    SIR YE MACHINE Genratore per chalega esaka quotation bhajie

    SIR ESAME IGBT WALA MACHINE MILEGA TO AAP UASA KIMAT BHEGIE
    AUR

    Reply

  4. Dear Sir,
    We are required 200 amp portable welding machine = 05 Nos and 400amp portable welding machine = 02 Nos.
    Please send the quotation

    Regards

    Jameel khan
    M/s Star Enterprises
    M: 8077208051

    1. We are thank you for the enquiry and we will send you the details required for the welding machine.

  5. Dear Sir

    Kindly clarify if any Overvoltage/ Overcurrent protection and main Fuse protection (Slow Blow) is available on this device

  6. In Jabalpur MP me distributor kaha par he addres & service center Jabalpur MP me he kya

  7. I brought long back Arc250S weldind machine. Can i use this on single phase. Please clarify

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ARC251iS 250A Inverter Welding Machine – Single Phase

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