5x20mm PCB‑Mount Fuse Holder | 10A Black Bakelite Industrial Fuse Block
PCB‑mount fuse holder for 5x20mm cartridge fuses is a black bakelite through‑hole soldered circuit‑protection component for low‑voltage PCBA. This fuse block uses high‑performance black bakelite insulating base with UL94 V‑0 flame‑retardant grade, paired with 0.5 mm thick phosphor‑bronze conductive terminals. Bakelite material delivers superior arc‑suppression and heat‑resistant performance. Designed for direct through‑hole PCB soldering assembly. Widely used in power adapters, household appliances, test instruments and general‑purpose industrial electronic control printed‑circuit‑boards.
Core Product Features
- Compatible with standard 5 × 20 mm glass / ceramic tubular cartridge fuses for PCB‑level over‑current‑protection
- Electrical rating: 10A, 250V /125V AC/DC; 50A breaking capacity for reliable fault‑current interruption
- Housing material: Black Bakelite, UL94 V‑0 flame‑retardant grade; excellent arc‑quenching and heat‑resistance performance
- Terminal: 0.5 mm thickness phosphor‑bronze, high spring tension, stable clamping performance
- Contact resistance below 5 mΩ; insulation resistance greater than 100 MΩ; 3000V AC power‑frequency withstand voltage
- Through‑hole PCB soldering mount, fits conventional wave‑soldering mass‑production workflows
- RoHS‑compliant construction, meets global consumer‑electronics and industrial safety standards.
Different from PBT plastic PCB fuse holders, black bakelite housing brings enhanced arc‑resistance and thermal stability, which is a preferred solution for PCBA where arc‑suppression and high‑temperature resistance are required.
Full Technical Specifications
| Specification Item | Parameter Value |
|---|---|
| Model | R3‑24 |
| Compatible Fuse | 5 × 20 mm glass / ceramic tubular cartridge fuse |
| Rated Current | 10A |
| Rated Voltage | 250V / 125V AC / DC |
| Breaking Capacity | 50A |
| Housing Material | Black Bakelite, UL94 V0 flame‑retardant |
| Terminal Material | 0.5 mm thick phosphor bronze |
| Contact Resistance | ＜ 5 mΩ |
| Insulation Resistance | ＞ 100 MΩ |
| Power Frequency Withstand Voltage | 3000V AC |
| Mounting Method | Through‑hole PCB soldering mount |
Selection & Application Guidance
When selecting this bakelite PCB‑mount fuse holder for 5×20 mm fuses, confirm fuse dimension, system AC‑DC voltage and continuous operating‑current first. Select matching‑rating 5x20mm tubular fuses and reserve a 1.25‑1.5× safety margin to avoid over‑heating under continuous‑load. Choose bakelite variant for projects requiring superior arc‑resistance performance. Follow official dimension drawing for PCB pad layout to guarantee soldering reliability and stable contact performance.
Typical Application Scenarios
- Power‑adapter and small switching‑power‑supply PCBA fuse accessories
- Household‑appliance control‑board and consumer‑electronics protection circuits
- Test instruments, multimeters and laboratory small‑power circuit‑boards
- Communication‑equipment auxiliary power‑input protection accessories
- LED power‑drivers and low‑voltage lighting‑control PCBA
- Small‑industrial‑automation module PCB over‑current‑protection accessories
Installation & Maintenance Instructions
1. Select correct‑rating 5 × 20 mm glass / ceramic tubular cartridge fuse according to circuit‑protection requirements.
2. Design PCB through‑hole pads strictly follow official dimension drawing to ensure soldering compatibility.
3. Complete wave‑soldering or manual‑soldering with proper temperature and dwell‑time; avoid over‑heat damage to bakelite housing.
4. Insert tubular fuse fully into holder cavity for reliable electrical contact.
5. Do not operate beyond published rated voltage‑current limits to prevent insulation breakdown and safety hazards.
6. Cut‑off full power supply and discharge circuit before fuse replacement to prevent electric‑shock hazard.
7. Periodically inspect for loose fuse, contact‑clip oxidation or heating signs; replace accessories promptly when anomalies are found.
Frequently Asked Questions
Q1: What fuse size fits this bakelite pcb fuse holder?
A1: It fits standard 5 × 20 mm glass and ceramic tubular cartridge fuses, widely‑used for PCB‑mount low‑voltage circuit‑protection.
Q2: What are its electrical ratings?
A2: Rated 10A, 250V/125V AC/DC; breaking capacity 50A for fault‑current interruption.
Q3: What is special about bakelite housing?
A3: Black bakelite base with UL94 V‑0 flame‑retardant grade, delivers outstanding arc‑suppression and high‑temperature resistance compared with ordinary plastic.
Q4: What are terminal and insulation‑related parameters?
A4: 0.5 mm phosphor bronze terminals, contact resistance＜5 mΩ; insulation resistance＞100 MΩ; 3000V AC power‑frequency withstand voltage.
Q5: What mounting style does it adopt?
A5: Through‑hole PCB soldering mount, compatible with wave‑soldering mass‑production for printed circuit boards.
Q6: What are main application‑fields?
A6: Applied for power adapters, household appliances, test instruments, LED drivers, communication‑equipment and various small‑power PCB‑based over‑current‑protection circuits.
