Where do I get the thermal switch in the Uk

[theprofessor]

I just purchased a wolfweld 140 for repairs... found 2 problems with the unit. 1. The thermal switch is bad, see photo below.

2 the circuit board transformer shows signs of being burnt.

Where can I get these 2 items in the UK.
The transformer does not seem to have a part number. Any ideas?

 

[Tigman]

RS ?

 

[zzr1200]

CPC Farnell

 

[theprofessor]

Neither one has them on their online catalog that I can find

 

[eddie49]

Hello and welcome to the Forum !

The 125 C thermal cutout switch will normally be closed. It is probably glued to the side of the main transformer...? Tapping or hitting it may help it to close again. If it has failed open-circuit, you could bypass it by joining the two wires together. For a replacement, search eBay for "thermal cutout switch".

The small transformer on the board drives the relay when the torch trigger switch is pressed. The relay is marked "18v DC", so you need to search eBay for "PCB transformer 18v". To confirm that the component actually has failed, check for AC voltage across the secondary when the welder is plugged in and powered on ( and the thermal cutout is closed ), or for continuity of the primary and secondary windings. The resistance of the primary ( which is the most likely to have burnt out ) may be surprisingly high - up to 3k Ohms, and a couple of hundred Ohms for the secondary.

Post #3 of this earlier thread may be a circuit diagram of the welder:

WOLF WELD 140 NO WIRE FEED!!!!

Hi all! was using my welder yesterday and all of a sudden the wire feed stopped! I’ve hooked up the motor to a battery and it works with a 12v feed but when I try it with the machine wires there isn’t even a 1v feed. You can hear the relay click but no wire movement!

www.mig-welding.co.uk

and this may be the circuit diagram of the PCB:
https://easyeda.com/Tonyataintree/wolf-weld-wire-feed-control-pcb