Part Location Diagram of 3B74133Q LG Fuse,Time Delay
See part 5001 in the diagram
( Grid squares measure 1x1 inch )
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Fuse,Time Delay 3B74133Q

 Fits your LRE3021ST!
★★★★★
★★★★★
3 Reviews

Rated by 3 customers 

Really Easy 

30 - 60 mins 

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$ 7.73
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 Fits your LRE3021ST!
PartSelect Number PS3522743
Manufacturer Part Number 3B74133Q
Manufactured by LG
Product Description

Fuse,Time Delay Specifications

The fuse-time delay may also be known as a line fuse or a microwave fuse, and it is a piece for your microwave. The function of this part is to shut off the microwave if there is a power surge, in order to protect your microwave from damage. You should consider having a service technician install this part as the high-voltage capacitors in a microwave can contain a very harmful electrical charge, even when the microwave is unplugged and has been inactive for some time. The tools that would be needed to complete this installation include a Phillips screwdriver, an insulated screwdriver, and a pair of pliers.
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Troubleshooting
This part fixes the following symptoms:
Won’t turn on | No heat
This part works with the following products:
Range, Microwave, Wall Oven, Microwave Oven Combo.
This part works with the following products:
LG, Kenmore, General Electric, Jenn-Air.
Part# 3B74133Q replaces these:
AP4440371, 3B74133H, 3B74133J, 3B74133K, 3B74133Q
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Customer Reviews
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★★★★★
3 Reviews
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Customer Repair Stories
 Average Repair Rating: 3.7 / 5.0, 3 reviews. What's this?
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Sorry, we couldn't find any existing installation instruction that matched.
MICROWAVE OVEN JUST SHUT DOWN, NO POWER,
TOOK OUT ALL SCREWS FRONT OVER DOOR AND AROUND FRONT FRAME, LIFTED FRONT FACE OFF, FIRST CKD FUSE, BUT FUSE HAS A WHITE GLASS SO DIDNT KNOW IF IT WAS GOOD OR BAD, NEXT THING I SAW WAS THE HIGH VOLTAGE CAPACITOR, BUT CKD YOUR PRICES ON THE PARTS AND THEY WERE TWO OF THE CHEAPEST TO REPLACE, IT WAS REALLY GUESS WORK ON MY PART, SEE I USED TO WORK ON OVERHEARD CRANES IN A FACTORY, I LEARNED WHEN THEY OUIT WORKING IT WAS USALLY EITHER A FUSE OR A CAPACITOR, SO MY GUESS WORK WAS IN MY FAVOR, AND MY MICROWAVE CAME TO LIFE, I THANK YOU FOR THE NICE EMPLOYEES YOU HAVE WORKING AT PART SELECT FOR THEIR HELP AND GREAT SERVICE, DARRELL INGLE , HOUSTON TEXAS
Other Parts Used:
CAPACITOR,HIGH VOLTAGE Fuse,Time Delay
  • Darrell from HUFFMAN, TX
  • Difficulty Level:
    Very Easy
  • Total Repair Time:
    15 - 30 mins
  • Tools:
    Pliers, Screw drivers
3 of 3 people found this instruction helpful.
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Loss of controls and no heat.
Assisted experienced and knowledgeable local repair shop technician. Had no issues during repairs. Microwave worked properly after repairs were completed.
Other Parts Used:
Thermostat Thermostat FILTER,GREASE Charcoal Filter Fuse,Time Delay
  • George from FALL RIVER, MA
  • Difficulty Level:
    Really Easy
  • Total Repair Time:
    30 - 60 mins
  • Tools:
    Screw drivers
8 of 9 people found this instruction helpful.
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Microwave operated but did not heat
Initial failure of over range microwave Aug 3rd. Control Panel worked but no heat. Took to local LG authoriaed local repair place. They fixed it quickly and we re-installed it. Worked fine for 2 months then had similar failure again. Agaim took to same authorized repairer. They kept unit for 3 months but finally concluded theu could not fix it and suggested we contact LG for a partial refund. When they tested the unit during re-assembly in my presence, there was a blue flash and the fuse blew. Since we had built a custom tile mural back splash around this unit, I brought it home, ordered a number of time delay fuses new capacitor and two new high voltage diodes. However, using my Fluke DMM, I checked the existing capacitor and high voltage diode and they checked OK so I just replaced the time delay fuse. The high voltage transformer leads had 2 possible ways to connect to capacitor and diode. Tried one way, plugged unit in and turned it on, and immediatly blew the fuse. Replaced the fuse and reversed the high voltage transformer connections,amd turned unit pn, and it worked perfectly. Since we had experienced several power failures during the time of the original failure, the repairer concluded that power spikes might be at fault, so I also purchased a TrippLite ISOBAR4ULTRA 3300 Joule surge protector between wall outlet and microwave, and re-installed over range. It has worked perfectly since.
  • Donald from Oak Ridge, TN
  • Difficulty Level:
    Easy
  • Total Repair Time:
    1- 2 hours
  • Tools:
    Screw drivers
1 of 7 people found this instruction helpful.
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Questions and Answers

Ask our experts a question about this part and we'll get back to you as soon as possible!

5 questions answered by our experts.
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Paul
March 21, 2018
Can i use a continuity tester to check whether or not the fuse (part # 3b74133q) needs to be replaced? Symptoms: Turntable and magnetron do not work, but electronic panel seems to function well. Timer and clock are okay.
For model number LRM1230W
PartSelect logo
Hi Paul, Thank you for your question. Yes, you would be able to test that part with a multi meter to check if it is working or not. Generally most fuses should read about 0 ohms. I hope that helps. Good luck with your repair.

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Ronald
November 8, 2017
Is this part easy to get to and replace, if not was is the cost of a technician? To replace the fuse, microwave wont turn on.
For model number 72181629600
PartSelect logo
Hi Ronald, Thank you for the question. We do not have technicians sorry, we are a website based company that sell appliance parts. You should be able to access the fuse by removing the vent grill and the control panel.You need to be careful when working on microwaves. The compacitor that is located close to the fuse can hold a charge even when the appliance is not plugged in.You can release the charge with a screw driver with an insulated handle.Hope this helps!

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Deborah
March 5, 2019
When i use my microwave, the breaker flips off. Why is this happening?
For model number 721.80042700
PartSelect logo
Hello Deborah, if your microwave is flipping your breaker it could be a sign of a defect. The most common part that would fix this issue is the control board, unfortunately this part is discontinued for your model. There is a possibility that you have too many appliances assigned to one circuit, in which case giving the microwave its own may fix the issue. Hope this helps!

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Glen
September 9, 2019
Micro wave works but no display for clock and settings
For model number LCRT2010ST
PartSelect logo
Hi Glen, thank you for your question. You would have to replace your control board as the display is integrated into that part. The part you are requesting on has been discontinued and we have no known replacement listed in our system. We have no further information. You are welcome to contact the manufacturer of the part to see if they have recently released a new substitute. This was the part number: EBR73927306. I hope that helps. Good luck with your repair. Good luck with your repair.

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Derrick
June 27, 2022
Replaced the fuse with a LG 3B74133Q but the turntable won't turn/work. The electronic panel works okay. Why doesn't the turntable work; what is the problem?
For model number 72180833500
PartSelect logo
Hello Derrick, Thank you for the question. If the appliance powers on and everything else works normally, you may have a faulty Turn Table Motor. If you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you!

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Model Cross Reference
This part works with the following models:
PartSelect Number: PS3522743
Manufacturer Part Number: 3B74133Q
Brand
Model Number
Description
LG
2263672
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LG
2263673
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LG
2263674
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LG
2263692
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LG
2263693
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2263694
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2263699
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295
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61282
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LG
61283
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LG
61289
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LG
619530
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LG
62212201
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LG
62219
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LG
62219201
Range - Oven-Range
LG
62222
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LG
62222301
Range - Oven-Range
LG
62223
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LG
62223201
Microwave - Microwave
LG
62229
Range - Oven-Range
LG
62229301
Range - Oven-Range
LG
62252
Wall Oven
LG
62253
Range - Oven-Range
LG
62259
Wall Oven
LG
62342203
Range - Oven-Range
LG
62344
Wall Oven
LG
62349
Range - Oven-Range
LG
62362
Range - Oven-Range
LG
62364
Range - Oven-Range
LG
62365
Range - Oven-Range
Customer Service Representative

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8am - 9pm EST

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