6.35×31.75mm PCB‑Mount Fuse Holder | 50A High‑Current Industrial Fuse Base
Industrial‑grade PCB‑mount fuse holder for 6.35×31.75mm tubular cartridge fuses, PBT UL94 V0 flame‑retardant housing with H65 brass contacts, rated 50A 250V AC /1000V DC, >3000V AC withstand voltage, designed for high‑current power converter, energy‑storage and industrial PCB board over‑current protection.
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R3(67)A ( fuse holder) (6.35×31.75mm fuse)
R3(67)B (PCB welded fuse holder) (6.35×31.75mm fuse)
PCB mount fuse holder for 6.35×31.75mm tubular fuses is a high‑current board‑soldered circuit‑protection component for high‑power AC‑DC systems. This pcb fuse base adopts high‑performance PBT insulating housing and reliable H65 brass contact points, providing excellent insulation strength and stable high‑current carrying performance. Designed for direct PCB soldering assembly, it is widely used in power converters, battery energy‑storage equipment, industrial power modules and high‑power control PCB boards.
Core Product Features
- Compatible with standard 6.35 × 31.75 mm tubular cartridge fuses for high‑power circuit‑protection
- High‑power rating: 50A at 250V AC; 50A at 1000V DC, supports high‑current and high‑voltage DC application scenarios
- PBT engineering plastic housing, UL94 V‑0 flame‑retardant grade, outstanding heat‑resistance and dielectric performance
- H65 brass contact points, good conductivity and anti‑oxidation performance for long‑term stable current‑carrying
- Insulation resistance greater than 100 MΩ; power‑frequency withstand voltage over 3000V AC, ensuring high‑safety operation
- Contact resistance below 5 mΩ for low power‑loss during continuous high‑current operation
- PCB soldering mounting design, suitable for automated through‑hole soldering production process
- RoHS‑compliant construction, meets global industrial electronics safety and environmental‑protection requirements
Different from panel‑mount fuse holders, this unit is designed for PCB onboard installation, saving cabinet space. Its 1000V DC & 50A rating makes it a preferred solution for new‑energy power‑conversion PCB circuits where high‑voltage DC and large‑current protection are required.
Full Technical Specifications
| Specification Item | Parameter Value |
|---|---|
| Model | R3(67)B |
| Compatible Fuse | 6.35 × 31.75 mm tubular cartridge fuse |
| Rated Current & Voltage (AC) | 50A @ 250V AC |
| Rated Current & Voltage (DC) | 50A @ 1000V DC |
| Housing Material | PBT, UL94 V‑0 flame‑retardant |
| Contact Material | H65 brass |
| Contact Resistance | ＜ 5 mΩ |
| Insulation Resistance | ＞ 100 MΩ |
| Power Frequency Withstand Voltage | ＞ 3000V AC |
| Mounting Method | Through‑hole PCB soldering mount |
Note: Original drawing document does not provide operating temperature and breaking‑capacity parameters.
Selection & Application Guidance
When selecting this PCB mount fuse holder for 6.35×31.75mm tubular fuses, confirm fuse dimension, system voltage type (AC/DC), and continuous operating current first. Select matching‑rating tubular fuses and keep a 1.25‑1.5× safety margin against continuous‑load overheating. For high‑voltage DC PCB applications such as energy‑storage and power converters, verify the 1000V DC rating meets system requirements. Follow official PCB pad dimension drawing for layout design to guarantee soldering reliability and current‑carrying capacity. Prefer UL94 V0 PBT‑housing parts for high‑temperature working environment on PCB boards.
Typical Application Scenarios
- Battery energy‑storage system PCB control and protection circuits
- Power converters, DC‑DC modules and high‑power power‑supply boards
- Industrial power modules and high‑current automation control boards
- New‑energy equipment and power electronic circuit boards
- Test equipment and high‑power laboratory instrument PCB circuits
- Telecom power supply and high‑current board‑mount protection units
Installation & Maintenance Instructions
1. Select correct‑rating 6.35×31.75 mm tubular cartridge fuse according to circuit‑protection requirements.
2. Design PCB pads strictly follow product dimension drawing to ensure good soldering and current‑carrying performance.
3. Complete soldering process with proper temperature and time; avoid over‑heating which may damage plastic housing.
4. Insert tubular fuse fully into holder to achieve reliable contact.
5. Do not operate beyond published rated voltage‑current limits to avoid insulation breakdown and safety risks.
6. Cut off full power supply and discharge circuit before fuse replacement to prevent electric shock hazard.
7. Periodically check for loose fuse, contact oxidation or heating signs; replace components promptly if abnormality occurs.
Frequently Asked Questions
Q1: Which fuse size does this PCB mount fuse holder fit?
A1: It fits standard 6.35 × 31.75 mm tubular cartridge fuses, used for high‑power board‑mount circuit‑protection.
Q2: What are its AC and DC electrical ratings?
A2: Rated 50A @250V AC and 50A @1000V DC, suitable for high‑current and high‑voltage DC PCB circuits.
Q3: What are housing and contact materials?
A3: Housing is PBT with UL94 V‑0 flame‑retardant grade; contact points adopt H65 brass with good conductivity and oxidation resistance.
Q4: What are insulation and withstand‑voltage parameters?
A4: Contact resistance＜5 mΩ; insulation resistance＞100 MΩ; power‑frequency withstand voltage＞3000V AC for reliable board‑mount insulation performance.
Q5: What mounting style does it use?
A5: Through‑hole PCB soldering mount, supports automated soldering production for printed circuit boards.
Q6: What kind of projects is this fuse holder suitable for?
A6: Mainly for energy‑storage systems, power converters, industrial power modules and other high‑power PCB over‑current‑protection scenarios.
