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Replacement type high voltage fuse tube for modern microwave ovens. This high voltage fuse is wired in series with the high voltage feed from the high voltage transformer to the magnetron. The fuse will fail if there is a fault in the high voltage circuit. Such a fault could be a short circuit magnetron or a short circuit high voltage rectifier. In our experience however this fuse commonly fails for no apparent reason. The fuse just gets stressed everytime the magnetron starts which eventually leads to the demise of the fuse. The fuse however may also fail if the microwave cooking cycle is started with no food or metal objects in the oven cavity.
If you have a microwave with this type of fuse then the symptom you will get if it has failed is no cooking action. The microwave will appear to start and countdown time but there will be no heating action. The fuse is easy to check visibly by unscrewing the fuse housing apart as shown in the photograph. You can then visually examine the wire in the fuse to see if it has broken. For the more technically minded a continuity check with an ohm meter will also check the fuse. A short circuit reading should be obtained if the fuse is intact.
The fuse can be replaced as a complete holder assembly though in this case the glass tube only is offered. This will alow a cheaper and equally as effective repair. In most instances the glass tube can simply be pulled from the end caps of the fuse holder. please refer to the photographs in this listing.The fuse holder is opened by twisting each end in opposite directions. Some high voltage fuse assemblies are smaller and rectangular in shape but in most cases after clipping apart a fuse tube, as shown here, is fitted inside. It is not relevant if your fuse tube does not have the coiled spring inside as ours do.
This is the technical specification of the fuse:
Current rating 700mA, 0.7A
Voltage rating 5kV
Overall length of fuse tube: 38mm
Fuse tube diameter: 7mm
This type of fuse is fitted to many brands of microwaves and this particular type of fuse is suitable for replacement in any brand. Check the rating of the original fuse and replace with the correct value. This listing is for the 700mA version but other values are available in our microwave parts section.
To fit this fuse it is necessary to remove the outer casing so replacement should only be attempted by those who have experience in the repair of electrical appliances. High voltages are present in a microwave oven and it is important that the appliance is disconnected from the mains before any servicing work is carried out.
Postage and packing on this item is FREE to all UK purchasers. Item sent using Royal Mail for delivery normally 1 - 2 working days after dispatch.This item can be posted worldwide. Please see the additional postage rates in the postage section of this listing.
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We comply with the distance selling regulations. In the first instance if you have a problem with an item purchased please get in touch. Contact details can be found in the "about me" page. You have 7 days after the point of delivery of your goods to advise that you wish to return them. All returned items that are returned as no longer required and not defective must be returned in the original condition received with all relevant packaging. A full refund will be provided including our postage and packing charge when the goods have been received and inspected.
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