Thermal Fuse Manufacturer

[stenzer]

Hi,

I'm repairing a coffee machine (Miele CVA 2660) where the thermal fuse mounted on-top of the hot-water heater has tripped (open). Does anyone know the manufacturer of the fuse shown in the attached picture?

The writing on the package is:
Tf 184 °C
D181 PT US

BR

 

[FvM]

E.g. microtherm

 

[stenzer]

Hi,

thank you. Yes this might be the correct manufacturere as the logo looks like an M with a T in between (to me).

BR

 

[BradtheRad]

I once replaced a blown thermal fuse in a fan. The replacement was from Radio Shack for a few dollars. They carried a few different temperature ranges.

I seem to recall choosing the next higher temperature above the original fuse rating, in hopes it would survive better.

 

[FvM]

Another major manufacturer is Cantherm. Consider that tripping of the thermal fuse usually indicates malfunction of the main thermostat, it should be checked and possibly repaired before replacing the fuse.

 

[stenzer]

Hi,

the reason for the blown fuse was a malfunction of a NTC which is used to monitor the hot-water heater's temperature. The NTC failed open, consequently the hot-water heater got too hot. I assume this was some kind of "smooth" transition, I do not expect a heating of the hot-water heater in case of a broken sensor signal.

BR

 

[FvM]

Fitting products on distributor stock:

770184 Thermodisc | Temperature Fuses | Bürklin Elektronik

Temperature Fuses ► 770184 from Thermodisc ► large selection from stock ✓ Top brands ✓ available immediately ► order online now!

www.buerklin.com

SDF DF184S Cantherm | Circuit Protection | DigiKey

Order today, ships today. SDF DF184S – Thermal Cutoff (TCO) AC DC 10 A 184°C (363°F) Axial from Cantherm. Pricing and Availability on millions of electronic components from Digi-Key Electronics.

www.digikey.de

 

[stenzer]

Thank you,

I was already considering the linked thermo-fuse from Buerklin. Interesting thing is the rated maximum/overshoot - temperature. The Datasheet from Buerklin states a temperature of 210 °C, whereas the datasheet available at the manufacturers webpage [1] states 240 °C.

[1] https://asset.conrad.com/media10/ad...4-c-10-a-250-vac-o-x-l-4-mm-x-645-mm-1-st.pdf

BR

--- Updated Jan 1, 2022 ---

I figured out who is the manufacurere of the thermal fuse shown in the picture, it is Elmwood Sensors (now Honeywell). According to this document [1], the original fuse is rated for 16 A. So I will use a 16 A one as well [2], although a 10 A one should be sufficient (hot-water heater has a power rating of 1200 W).

The 16 A version provides a larger thermal safety range, by means of its maximum overshoot temperature of 350 °C.

[1] https://docs.rs-online.com/ec9a/0900766b80029806.pdf
[2] https://asset.conrad.com/media10/ad...4c-thermal-fuse-184-c-16-a-250-v-ac-1-pcs.pdf

BR