R3-54A 5x20mm Panel Mount Fuse Holder for DC and AC Circuits
Dual-rated 5x20mm panel fuse socket: 10A at 125VDC or 6.3A at 250VAC, 50A interrupt. PBT UL94 V0 body, 16mm bezel, phosphor copper terminals, 3000VAC hi-pot. Compact behind-panel depth for DC control and AC mains circuits.
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R3-54A 5x20mm Panel Mount Fuse Holder for DC and AC Circuits
Why R3-54A Stands Out
Most 5x20mm panel holders carry a single AC rating. The R3-54A, however, specifies two ratings: 10A at 125VDC and 6.3A at 250VAC. This dual rating makes it a natural choice when your product line mixes DC control circuits with lower-voltage AC branches.
The holder accepts standard 5x20mm glass or ceramic cartridge fuses. Moreover, it delivers a 50A interrupt capacity, which covers typical fault levels in power supply inputs, control panels, and equipment mains.
Housing and Terminals
We mould the body from PBT material certified to UL 94 V0. This choice delivers flame retardancy without adding the cost of higher-grade engineering plastics. The terminals use 0.5mm phosphor copper. Consequently, spring contact pressure stays consistent across repeated fuse insertion cycles.
Electrical specs include a 3000VAC dielectric withstand test and insulation resistance above 100MΩ. Contact resistance measures below 5mΩ. Therefore, on-state heating remains minimal even at full rated current.
Mechanical Drawing Summary
- Fuse cartridge: 5 x 20 mm
- Rated current: 10A (125VDC) / 6.3A (250VAC)
- Interrupt capacity: 50A
- Front bezel diameter: 16.0 mm
- Mounting hole: Ø12.7 mm
- Terminal tab: 12.0 mm × 12.7 mm, 2.8 mm thick
- Overall length: 38.6 mm
- Body behind panel: 30.5 mm
- Flange thickness: 2.0 mm
Typical Use Cases
Designers typically specify the R3-54A for bench power supplies, control relay panels, and low-voltage DC distribution boards. The 16mm front bezel gives a visible fuse access point without requiring a large cutout. Meanwhile, the 38.6mm overall length keeps the behind-panel depth modest, which matters in slim enclosures.
Ordering Information
Each unit ships with the threaded body and mounting hardware. Terminals come as phosphor copper by default. If your assembly requires tin plating or formed lead lengths, please flag this during your RFQ.
Datasheet
[Download R3-54A specification sheet (PDF)]r3-54A Panel fuse holder
FAQ
What ratings does the R3-54A carry?
It is rated 10A at 125VDC and 6.3A at 250VAC. This dual rating suits designs that mix DC control and AC mains branches.
What size fuse does it accept?
Standard 5x20mm cylindrical cartridge fuses, glass or ceramic.
What panel hole is required?
A Ø12.7mm mounting hole. The front bezel measures 16.0mm across.
How deep does it sit behind the panel?
Body depth behind the panel is 30.5mm; total length including terminals reaches 38.6mm.
Is the housing self-extinguishing?
Yes. The PBT body is certified UL 94 V0.
What is the interrupt rating?
50A, suitable for typical power supply and control panel fault levels.
Are terminals tin-plated?
Standard terminals are phosphor copper. Tin plating is available on request.
