R3-52 5×20 Inline Fuse Holder | 1A–15A 250V/500V
R3-52 inline fuse holder for 5x20mm glass/ceramic fuses: 1A–15A, 250V/500V AC/DC. Bakelite body, brass hardware, -20°C~125°C.
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R3-52 5×20 Inline Fuse Holder — 1A to 15A, 250V/500V AC/DC
Screw-type inline fuse holder for 5x20mm glass and ceramic fuses. Bakelite body, brass hardware, carbon steel spring.
Because consumer electronics and small power supplies need low-cost, reliable branch protection, designers choose the R3-52 for 5×20 tube fuses. In particular, its bakelite body resists heat. Moreover, brass hardware and a carbon steel spring keep contact stable. As a result, it works from -20°C up to 125°C.
Product at a glance (for quick reference)
- Model: R3-52 inline fuse holder; for 5x20mm glass or ceramic fuses.
- Ratings: 1A–15A; 250V / 500V AC/DC.
- Materials: bakelite body, brass hardware, carbon steel spring.
- Lead wires: gauge matched to current (specify when ordering).
- Operating temperature: -20°C to 125°C.
- Body: 50.4 mm long, Ø12.6 mm; screw cap Ø7.28 mm.
screw cap Ø7.28 mm
Specifications
| Model | R3-52 inline fuse holder |
|---|---|
| Fuse size | 5 x 20 mm glass / ceramic tube |
| Current rating | 1A – 15A |
| Voltage rating | 250V / 500V AC / DC |
| Body material | Bakelite (phenolic) |
| Hardware | Brass |
| Spring | Carbon steel |
| Lead wires | Gauge matched to current |
| Operating temp. | -20°C to 125°C |
Key Features
- 5×20 compatibility: accepts standard glass and ceramic tube fuses.
- Wide rating range: 1A–15A at 250V/500V AC or DC.
- Heat-resistant body: bakelite handles up to 125°C.
- Brass + steel contact: brass hardware with carbon steel spring for reliable contact.
- Screw cap: easy in-line fuse replacement without tools beyond a twist.
Why it works in power supplies and electronics
Because most small AC/DC power supplies protect their input with a 5×20 tube fuse, the R3-52 drops directly into that application. Consequently, design engineers use it in adapters, LED drivers and instrumentation. For example, a 5A fuse protects a 12V DC fan board. However, you must match the lead wire gauge to the fuse current; otherwise, the leads overheat. In addition, the bakelite body stays rigid even near 125°C.
Mechanical Dimensions (mm)
| Dimension | Value (mm) | Notes |
|---|---|---|
| Overall length | 50.4 | End-to-end body length |
| Body diameter | Ø12.6 | Main body OD |
| Cap diameter | Ø7.28 | Screw cap / lead end OD |
| Lead hole diameter | Ø3.2 | Wire exit hole |
| Step section length | 29 | From right end to body step |
Dimensions per manufacturer datasheet and subject to change without notice. Verify before production.
How to order and install
First, choose a 5×20 fuse whose rating matches your load. Next, specify the lead wire gauge that suits the current. Then thread the holder in-line on the hot side of the circuit. Finally, unscrew the cap, insert the fuse and tighten by hand. If you need a specific lead length or AWG, simply state it when ordering.
Applications
- AC/DC power supplies and adapters input protection
- LED drivers and lighting electronics
- Instrumentation, meters and control panels
- Home appliances and consumer electronics
- Automotive 12V accessory branch circuits (within 15A rating)
