PTF-40 5x20mm Panel Mount Fuse Holder 10A 250VAC
5x20mm panel mount fuse holder, 10A 250VAC, 2.5W acceptance. PBT UL94 V0 housing, IP40, PC2, -30°C to 85°C. Two panel thickness options: 1.6-2.5mm or 0.8-1.8mm. Linear derating above 40°C for predictable thermal design.
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PTF-40 5x20mm Panel Mount Fuse Holder 10A 250VAC
Thermal Performance You Can Design Around
The PTF-40 follows a predictable derating curve that makes it easy to design into real enclosures. It accepts the full 2.5W power acceptance up to 40°C ambient. Above 40°C, the allowable power drops linearly, reaching 0W at 85°C.
This behaviour matters. In a sealed cabinet running at 55°C, for instance, you can safely draw about 1.75W through the holder. In a ventilated bench supply holding at 30°C, you use the full 2.5W. Designers who plot this curve into their thermal budget avoid nuisance fuse failures.
Electrical Ratings
- Fuse cartridge: 5 x 20 mm
- Mounting: Panel
- Rated current: 10A
- Rated voltage: 250VAC
- Rated power acceptance: 2.5W
- Housing material: PBT, UL 94 V0
- Shocksafe category: PC2
- Degree of protection: IP40
- Contact resistance: <5mΩ
- Operating temperature range: -30°C to +85°C
- Standard colour: Black (other colours on request)
Panel Thanning Options
The PTF-40 supports two panel thickness ranges to cover different enclosure types:
| Option | Panel Thickness Range |
|---|---|
| Standard | 1.6 mm min to 2.5 mm max |
| Thin panel | 0.8 mm min to 1.8 mm max |
Specify your panel thickness when ordering. The threaded nut clamps securely across either range.
Why PBT?
PBT offers a balance of mechanical strength and electrical insulation at a reasonable cost. It does not brittle at -30°C, and it holds dimensional stability up to 85°C. The IP40 rating protects against finger contact and small solid objects, which suits most indoor panel mount applications.
Phosphor copper terminals maintain spring pressure over the fuse’s service life. Contact resistance stays under 5mΩ. Therefore, steady-state heating remains within the derating curve shown above.
Typical Applications
- Power supply input panels
- Industrial control cabinets
- UPS and charger modules
- Lighting ballasts and drivers
- Test equipment front panels
Datasheet
[Download PTF-40 specification sheet (PDF)]PTF-40 Panel fuse holder
FAQ
1: What size fuse does the PTF-40 accept?
A: Standard 5x20mm cylindrical fuses.
2: What is the current and voltage rating?
A: 10A at 250VAC, with 2.5W power acceptance.
3: How does the derating curve work?
A: The PTF-40 runs at full 2.5W up to 40°C. Above 40°C, allowable power drops linearly to 0W at 85°C.
4: What panel thickness does it fit?
A: Two options are available: 1.6mm to 2.5mm, or 0.8mm to 1.8mm. Specify when ordering.
5: Is the housing flame retardant?
A: Yes, the PBT body is rated UL 94 V0.
6: What is the IP rating?
A: IP40.
7: What is the operating temperature range?
A: -30°C to +85°C ambient.
8: What colours are available?
A: Standard is black. Other colours are available on request.
