Thermal Cutoff/Fuse ID -Surge Protector

**m4a2t0t** · 01-12-2022, 09:36 PM

According to This PDF Its rated 109c functioning and 103c holding but all I can find is 109c functioning and 83c (10A) / 88c (15A) holding or 128c functioning and 103c holding.

It is labeled D108 PPqH

Should I try and match the functioning temp or the holding temp?

The protector is 6 outlets rated at 15A. That PDF shows 25A @ 240v but say 5 LRA @ 120V. I can only find 10A and 15A versions.

Thanks for any help

**sam_sam_sam** · 01-13-2022, 02:10 AM

I would probably go with this one

“ I can find is 109c functioning and 83c (10A) / 88c (15A) holding”

This will mean probably that it will trip sooner than the original one did but this might be better in the long run

**m4a2t0t** · 01-13-2022, 11:23 AM

ok thanks

**redwire** · 01-13-2022, 12:04 PM

I would match the fusing temperature 109°C. This is a power strip so it is supposed to prevent fire when the MOV's overheat.

If it was a food cooker that goes unsafe just above boiling temperature I would also be wanting the holding temp to be a match as well so it doesn't pop when cooking normally. But as you found, most TCO out there are not like the data you found German made. Thermal cutoffs are typically about a 30°C difference between normal operating and unsafe temperature.
You can buy MOV's that have the thermal fuse built in, like Littelfuse TMOV but they are a lot thicker. The TCO will be coupled to the MOV's with Kapton tape or a braided sleeve, so a hot MOV=hot TCO.

faraday28 · 01-20-2022, 12:41 PM

109C functioning: meaning that fuse will be blown up/disconnected after reaching 109C under minute or 30s or less.

103C holding: meaning the fuse would hold @103C 168Hours* without any load. (holding temp meaning max temp which fuse never break @0 Amp)

83c (10A): meaning the fuse can hold at 83C with 10A current load.

use resistive load, because outlets always in resistive load rating.

*designed product by Elmwood.

Use same spec 109C functioning temp. the hold temp can be vary because the specification criteria is made by manufacture and can be vary from one to another as same as capacitor manufacture write max ripple rating, but as long as the functioning temp is match, you are good to go.

Edit: and current rating must be match as the original parts.

01-13-2022, 02:10 AM	#2
sam_sam_sam Badcaps Veteran Join Date: Jul 2011 City & State: Some times Sunny Jacksonville FL My Country: USA Line Voltage: 120 Volts 60 HZ I'm a: Knowledge Seeker Posts: 3,559	Re: Thermal Cutoff/Fuse ID -Surge Protector I would probably go with this one “ I can find is 109c functioning and 83c (10A) / 88c (15A) holding” This will mean probably that it will trip sooner than the original one did but this might be better in the long run __________________ 9 PC LCD Monitor 6 LCD Flat Screen TV 30 Desk Top Switching Power Supply 10 Battery Charger Switching Power Supply for Power Tool 6 18v Lithium Battery Power Boards for Tool Battery Packs 1 XBox 360 Switching Power Supply and M Board 25 Servo Drives 220/460 3 Phase 6 De-soldering Station Switching Power Supply 1 Power Supply 1 Dell Mother Board 15 Computer Power Supply 1 HP Printer Supply & Control Board * lighting finished it * These two repairs where found with a ESR meter...> Temp at 50F then at 90F the ESR reading more than 10% 1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later ) 2 Hem Saw Computer Stack Board All of these had CAPs POOF All of the mosfet that are taken out by bad caps

01-13-2022, 11:23 AM	#3
m4a2t0t Senior Member Join Date: Mar 2013 City & State: Arizona My Country: USA I'm a: Knowledge Seeker Posts: 108	Re: Thermal Cutoff/Fuse ID -Surge Protector ok thanks

01-13-2022, 12:04 PM	#4
redwire Badcaps Veteran Join Date: Dec 2010 City & State: Alberta My Country: Canada Posts: 2,538	Re: Thermal Cutoff/Fuse ID -Surge Protector I would match the fusing temperature 109°C. This is a power strip so it is supposed to prevent fire when the MOV's overheat. If it was a food cooker that goes unsafe just above boiling temperature I would also be wanting the holding temp to be a match as well so it doesn't pop when cooking normally. But as you found, most TCO out there are not like the data you found German made. Thermal cutoffs are typically about a 30°C difference between normal operating and unsafe temperature. You can buy MOV's that have the thermal fuse built in, like Littelfuse TMOV but they are a lot thicker. The TCO will be coupled to the MOV's with Kapton tape or a braided sleeve, so a hot MOV=hot TCO.

01-20-2022, 12:41 PM	#5
faraday28 New Member Join Date: Jan 2022 City & State: Jakarta Pusat My Country: Indonesia I'm a: Knowledge Seeker Posts: 12	Re: Thermal Cutoff/Fuse ID -Surge Protector 109C functioning: meaning that fuse will be blown up/disconnected after reaching 109C under minute or 30s or less. 103C holding: meaning the fuse would hold @103C 168Hours* without any load. (holding temp meaning max temp which fuse never break @0 Amp) 83c (10A): meaning the fuse can hold at 83C with 10A current load. use resistive load, because outlets always in resistive load rating. *designed product by Elmwood. Use same spec 109C functioning temp. the hold temp can be vary because the specification criteria is made by manufacture and can be vary from one to another as same as capacitor manufacture write max ripple rating, but as long as the functioning temp is match, you are good to go. Edit: and current rating must be match as the original parts.

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