Microswitch Compatability


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Old 03-21-16, 10:19 AM
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Question Microswitch Compatability

Hello, working on my miller welder 220v. The off switch broke and I ordered a new one to replace it. The way they labeled the ratings on these really confuses me and I'm afraid I didn't get one that will work. Is there anyone on here that knows more about it that I that could help? Attached a picture.Name:  P1010019.jpg
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Right switch in picture says:
Ui:380v
AC-15
Ue:250v
Ie:6a
Other Column:
Ith:15a
DC-13
Ue:220v
Ie:0.3a
 
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Old 03-21-16, 01:41 PM
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It will work fine. Just make sure to wire same way as old one.
 
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Old 03-21-16, 05:45 PM
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My company makes microswitches. As you can see, the DC current rating is FAR below the AC rating. That's pretty typical. To a lessor extent, the voltage of the applied circuit also affects its current rating.
The switch on the right is a "IEC" or euro type switch. The symbols may be unfamiliar.

Ui is an insulation rating. It's 380V for this one. Pretty useless to know for most apps.
Ith is a current rating of the wiring and connections to the switch, but not its contacts. Even more useless, IMO.
Ue 250V and Ie 6a are ratings relate to AC.
Ue 220V and Ie .3a are for DC circuits.
And, I don't know what AC-15 and DC-13 even mean..
 
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Old 03-21-16, 08:15 PM
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I don't recognize that type of power switch in a welder..... is that a momentary push button switch ?
 
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Old 03-22-16, 08:50 AM
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Yes it is the off button for the welder. Strange setup I know.. I put the switch in and hit it with a broom handle to make sure it didn't blow up :-D and it works fine. Went to mount the Chinese switch into the welder and the thing broke instantly. Such a cheap POS.. Got to find a replacement now.. I just hit the breaker on the welder to turn it off at the moment.
 
 

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