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Description
EPCOS B65811J0000R087 Transformer Cores, RM, RM8, N87, 38 mm, 64 mm�The B65811JR87 is a Ferrite Core, RM 8 core, N87 grade. Ferrite cores have to meet mechanical requirements during assembling and for a growing number of applications. Since ferrites are ceramic materials one has to be aware of the special behaviour under mechanical load. As valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing or tensile load. Especially high cooling rates under ultrasonic cleaning and
The B65811JR87 is a Ferrite Core, RM 8 core, N87 grade. Ferrite cores have to meet mechanical requirements during assembling and for a growing number of applications. Since ferrites are ceramic materials one has to be aware of the special behaviour under mechanical load. As valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing or tensile load. Especially high cooling rates under ultrasonic cleaning and high static or cyclic loads can cause cracks or failure of the ferrite cores. Stresses in the core affect not only the mechanical but also the magnetic properties. It is apparent that the initial permeability is dependent on the stress state of the core. The higher the stresses are in the core, the lower is the value for the initial permeability. Thus the embedding medium should have the greatest possible elasticity.
- Ferrites can run hot during operation at higher flux densities and higher frequencies
- The magnetic properties of NiZn-materials can change irreversible in high magnetic fields
Applications
Industrial
Product details
| Ae Effective Cross Section Area | 64mm� |
| Effective Magnetic Path Length | 38mm |
| Core Material Grade | N87 |
| Core Type | RM |
| Product Range | RM Series |
| For Use With | - |
| Inductance Factor Al | 3.3�H |
| Core Size | RM8 |
Other details
| Brand | EPCOS |
| Part Number | B65811J0000R087 |
| Quantity | 1 Pair |
| Technical Data Sheet EN | |
| Product Change Notice EN |
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. Image is for illustrative purposes only. Please refer to product description.
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4.7 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 4
Magnets are strong
Color: E-Blackpro 4
Arrived fast. Magnets are really strong on my husbands metal peg board in the garage outside. The only draw back, the rings are slightly long for a work bench area. Wish they were 3-4''.
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Reviewed in the United States on May 27, 2025
★★★★★ 5
High Quality and Operability - Great!
Great mouse! Not only good, but feels and operates as well as, or better than a Microsoft mouse, and a lot more reasonable! Comes with AAA batteries, the USB transceiver is stored inside the battery compartment (good when packing and traveling), and a white support strap lays down below the installed batteries so that it is easier to remove them when its time to change the battery. Be sure to go into Control Panel/Mouse and make any click-speed or mouse movement adjustments to your liking. I plan on buying another one of these for my second HP laptop. The USB transceiver is immediately responsive and you will see a red laser at the bottom of the mouse.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Comfortable feel
Easy connect. Works smoothly. Feels comfortable in the hand. Price is great. Good choice.
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Reviewed in the United States on April 17, 2026
★★★★★ 5
It works and is well priced.
This mouse works as well as much higher-priced brand-name items. It fits well in the hand. The durability is very good. Considering the price compared to other brand names, this is a very good value.
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Reviewed in the United States on May 27, 2026
★★★★★ 4
Solid Everyday Mouse with a Few Comfort Trade-Offs
I’ve been using this Amazon Basics 2.4 GHz wireless optical mouse as a simple, no-frills option, and overall it does exactly what it’s supposed to do. Setup was instant with the USB nano receiver, tracking is accurate, and the wireless connection has been reliable with no dropouts or lag during daily use. It’s lightweight and works well for general browsing and office tasks.
Where it falls a bit short for me is ergonomics. Compared to my Logitech mouse, this one doesn’t feel quite as natural or contoured in the hand during longer sessions. It’s by no means uncomfortable, just not as refined in terms of hand fit. That said, for the price and simplicity, it’s a dependable mouse that gets the job done. A solid choice if you want something basic and reliable.
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Reviewed in the United States on January 10, 2026