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Cros-arc 503s Water Cooled Mig Welder,

Cros-arc 503s Water Cooled Mig Welder,

£2,926.00
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Cros-arc 503s Water Cooled Mig Welder,
  • Cros-arc 503s Water Cooled Mig Welder,
  • Cros-arc 503s Water Cooled Mig Welder,
  • Cros-arc 503s Water Cooled Mig Welder,
  • Cros-arc 503s Water Cooled Mig Welder,
Cros-arc 503s Water Cooled Mig Welder,

Cros-arc 503s Water Cooled Mig Welder,

£2,926.00
Shipping calculated at checkout.

CROS-ARC 503S WATER COOLED MIG WELDER, is a 415V industrial MIG/MAG system for demanding fabrication, repair and professional workshop welding applications.

Key Features

  • Water-cooled industrial MIG/MAG system
  • Active four-roll wire feed
  • Digital voltage and ammeter display
  • 50–500A welding current range
  • Integral water cooling unit
  • Supplied with 500A water-cooled torch
Technical Support

Everything we sell is supported by our factory trained engineers at our premesis in Manchester or nationwide through our mobile service engineers.

Delivery + Returns

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Supply voltage

Supply

400V

Warranty

Warranty

2 Years

Free delivery

Free Delivery

UK mainland delivery

Service engineers

Service

In-house engineers

Technical support

Support

0161 223 1843

Expert Advice

Paul Jones

Paul Jones says

The CROS-ARC 503S is a heavy-duty, water-cooled MIG/MAG welder for industrial workshop use. I would expect it to suit fabrication work, chassis repairs and production welding where sustained output is required rather than occasional light welding.

In practice, the separate wire feed system gives useful reach around larger fabrications, while the four-roll drive helps maintain consistent wire feeding with longer torch runs and heavier wire. The integral cooler is important when running the 500 amp torch at higher settings, particularly on long welds or in a busy bodyshop environment. It needs a suitable 415V three-phase supply, adequate protection and correct coolant circulation before work starts.

A common issue I see with water-cooled equipment is poor maintenance of the cooling circuit. Blocked filters, low coolant level or incorrect fluid can quickly reduce torch performance and lead to avoidable failures. Earth connection, gas flow and wire-drive pressure also need checking before blaming the power source.

Used within its duty cycle and maintained properly, this is a dependable machine for demanding MIG work where stable output and controlled heat management matter.

Paul Jones, Technical Director

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At BWS, we do more than supply equipment. Our experienced engineers work with the products we sell every day, providing practical advice to help you choose the right equipment for your workshop.

From installation and training to servicing, calibration and repairs, we’re here to support you long after your purchase. You’re not simply buying a machine — you’re gaining access to a team that understands how to keep it working.

See What We Do!

Technical Features

  • 415V threephase industrial MIG/MAG power source for demanding fabrication and workshop applications
  • Watercooled system with integral cooler for sustained heavyduty welding
  • Active 4roll wire feed system for consistent, stable wire delivery
  • Digital volt/amp meter for monitoring and accurate adjustment of welding conditions
  • Stepcontrolled output with 30 voltage settings for practical control across different welding tasks
  • Wide welding range suitable for lowto highcurrent industrial work
  • Highdutycycle design for extended production and repair use
  • Supplied with undergear and cylinder carrier for workshop manoeuvrability
  • Includes 3metre interconnecting, primary, gas and earthreturn cables
  • Supplied with a 4metre 500A watercooled MIG torch
  • 5or 10metre interconnecting cable options for larger work areas and remote wirefeed arrangements
  • Optional wirefeed unit wheel kit for easier movement around the workshop
  • Suitable for professional fabrication, industrial repair and heavyduty bodyshop applications requiring reliable continuous MIG/MAG welding

Specification

Power Supply
415V 3Ph (+15%
Fuse Rating
T35
Current Range
50–500A
Voltage Steps
3 x 10
Voltage Range
16.5–38V
Duty Cycle
420A at 60%
Protection Class
IP23
Weight
180kg
Wire Feed System
Active 4-roll
Water Cooling
Integral water cooler
Part Number
CAP0082

FAQs

What power supply does the CROS-ARC 503S require?
It requires a 415V three-phase supply with a T35 fuse rating. This is an industrial machine and should be installed on a suitable workshop supply by a qualified electrician.
What welding output and duty cycle does it provide?
The current range is 50–500A, with a voltage range of 16.5–38VDC across 30 voltage steps. Its duty cycle is rated at 420A at 60%, making it suitable for demanding fabrication and industrial MIG/MAG work.
What are the main features of this water-cooled MIG welder?
It has an integral water cooler, active 4-roll wire feeding and a digital volt/amp meter for controlled, consistent welding. The standard package includes a 4-metre 500A water-cooled MIG torch, undergear and cylinder carrier, cables, gas hose and earth return.
Can the cable length be specified for different workshop layouts?
Yes. The standard package includes 3-metre interconnecting cables, with 5-metre and 10-metre options available. Longer cables can be useful where the power source and separate wire-feed arrangement need to be positioned away from the work area.