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Can I replace the ceramic fuse with any 20 amp fuse?

I bought a replacement ceramic fuse for $3.00. It worked untill I pushed the pannel to hear something and it blew out. The fuse fit properly. Now what❓#JVM3160RF3SS

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Mine blows when I open the door everytime

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@Jeff Ferris what model is your MW? What have you checked?

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Hi @sissysue ,

Generally with fuses as long as you replace it with a fuse having the same rating it is OK to do so. Although ceramic fuses do offer better thermal and arc protection than glass fuses which is why they’re used in microwave ovens and other high current appliances.

The fuse is a 250V 20A slow blow fuse. It is usually marked on the fuse end caps as 250V T20A (T = Timed or slow blow)

Be aware that there is always a reason why a fuse blows.

If you caused it by pushing on the control panel then it seems that the problem may be there and that there is not a problem with the fuse as it was only doing what it was designed to do i.e. blow and therefore protect the appliance from further damage due to the fault and also the user e.g. possible fire or electrocution. It also may be somewhere else and it was just coincidental that it occurred when you did this.

The oven would need to be tested to find out why it happened.

Be safety aware when working inside a microwave oven. The HV capacitor can store >6000V DC for months even if the power has been disconnected for this length of time. This amount of voltage can seriously injure you or worse. The HV capacitor needs to be correctly discharged as soon as it is accessible after removing the cover from the microwave and before doing anything else inside the oven.

If you don’t know how to safely test microwave oven circuits then don’t do it! Contact a reputable, professional appliance repair service and ask for a quote

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Hi @Jeff Ferris

What is the model number of the microwave oven?

Have you been stopping the oven from operating by simply opening the door and not pausing the operation using the control panel, by any chance?

If so there may be a problem with one of the door interlock switch contacts remaining closed when it should be open, when the door is opened. With a lot of microwave ovens there are 3 separate door interlock switches. Two that close when the door is shut and one that opens when the door is shut. They are operated by the latch arms on the door.

Opening the door whilst the oven is still working, will stop the oven operating as it is a safety feature designed to prevent harmful microwave radiation from escaping out through the open door. (With the door closed the oven becomes a Faraday cage).

However it is not a good habit to get into. Doing this will cause the switch contacts to arc and this eventually causes contact migration which means that the switch contacts become permanently welded together instead of opening and closing.

If you have only ever opened the door after the oven has stopped operating or have paused it using the control panel, then it may just be a loose switch not correctly operating and releasing.

To find replacement switches (if one is faulty) search online for (insert make and model number of microwave oven) parts to find suppliers that suit you best. Some have parts diagrams that show the layout of the microwave oven e.g. searspartsdirect.com and partselect.com

If you decide to check if the interlock switches are OK etc, also see the safety advice in the answer above

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