Electronics > Projects, Designs, and Technical Stuff

Easily replaceable MOV

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Raj:
So I was repairing a power supply which had a blown fuse and MOV. If MOV gets old and eventually explode, oozing out a metallic stuff, why don't we make em like fuse, easily changeable by just popping a hatch?

mikerj:
A MOV isn't like a fuse that breaks a circuit, it effectively shorts a circuit to clamp transients.  Putting it in a socket adds additional contact resistance that could degrade over time which would reduce the performance of the device.  Also making it user replaceable like a fuse is inviting disaster, the wrong voltage value WILL be fitted meaning it either doesn't work or it goes bang as soon as it's plugged in.

Alti:

--- Quote ---If MOV gets old and eventually explode
--- End quote ---
:bullshit: MOVs do not explode when old.

Brumby:

--- Quote from: Alti on July 07, 2020, 09:06:08 am ---
--- Quote ---If MOV gets old and eventually explode
--- End quote ---
:bullshit: MOVs do not explode when old.

--- End quote ---
Depends on what you define as getting "old".

And as for not exploding ....



The MOV is what is inside the yellow box.

Vovk_Z:
Looking at this photo it seems to me that X2 cap made a good job by preventing fire and soot at it's side. :)
If it was two X2 caps at bith MOV sides - it could be better. :)
And it looks unsafe to place a MOV near a fuse.

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