5x20mm Panel Fuse Holder | Board Mount Dual Design 250V Industrial Fuse Base

The panel fuse holder with dual mounting design is a versatile circuit protection component for 5×20mm cartridge fuses, supporting both front panel installation and PCB board mounting. This 5x20mm panel fuse holder adopts high-temperature bakelite insulating base paired with 0.5mm phosphor bronze conductive terminals, delivering reliable insulation performance, stable contact and durable overcurrent protection for low-voltage AC and DC circuits. Its flexible dual installation structure makes it widely used in switching power supplies, industrial control equipment, household appliances and instrumentation, with strong adaptability to different assembly processes.

Core Product Features

• Dual installation design: supports both panel mount and PCB board mount, adapts to different assembly requirements
• Compatible with standard 5×20mm glass and ceramic cartridge fuses, covers mainstream low-voltage protection specifications
• Rated 10A at 250V AC/DC, wide voltage compatibility, strong versatility across different application scenarios
• Bakelite housing, UL94 V0 flame retardant grade, excellent high-temperature resistance and arc suppression performance
• 0.5mm thick phosphor bronze terminals, high elasticity, stable clamping force, contact resistance below 5mΩ
• 3000V AC power frequency withstand voltage, insulation resistance above 100MΩ, high operational safety
• 50A breaking capacity, effectively interrupts fault current to protect downstream electrical components
• Fully RoHS compliant, meets global electronics safety and environmental protection requirements

Compared with single-installation fuse holders, this dual-design model can be installed on equipment front panels or directly soldered on PCB boards, providing higher flexibility in structural design and assembly processes. Its bakelite housing has outstanding thermal stability and arc resistance, making it a classic protection solution for low-voltage power supplies and control circuits.

Full Technical Specifications

Selection & Application Guidance

When selecting a panel fuse holder, first confirm the fuse size, system rated voltage, operating current and required installation method. This dual-design model supports both panel and board mounting, which can effectively reduce procurement types for projects with mixed assembly requirements. Choose a 5x20mm fuse with appropriate current rating based on actual load, and reserve a 1.25–1.5 times safety margin to prevent overheating during continuous operation. For front-panel fuse replacement scenarios, use the panel mount method; for high-integration circuit board designs, use the PCB board mount method. For flame retardant and insulation-sensitive scenarios, prioritize products with UL94 V0 grade housing and high insulation resistance to ensure operational safety.

Typical Application Scenarios

• Switching power supplies, adapters and power distribution units
• Industrial control panels and small automation equipment circuits
• Household appliances and small electrical equipment power protection
• Test instruments and laboratory power supply circuits
• Communication equipment and network terminal power protection
• LED lighting drivers and low-voltage power modules
• Medical equipment auxiliary circuits and low-voltage control systems

Installation & Maintenance Instructions

1. Select a 5x20mm cartridge fuse with correct current and voltage rating according to circuit protection requirements.

2. For panel mount: Drill a standard mounting hole on the equipment panel, insert the fuse holder from the front side, and tighten the fixing nut from the back to ensure firm installation.

3. For board mount: Insert the terminal pins into the corresponding PCB holes, and ensure proper soldering quality to avoid cold solder joints that cause increased contact resistance.

4. Insert the fuse fully into the holder and tighten the end cap to ensure reliable contact and insulation performance.

5. Do not operate beyond the rated voltage and current range to prevent insulation breakdown and safety risks.

6. Disconnect the power supply completely before fuse replacement to avoid electric shock and short circuit damage.

7. Inspect terminals and fuses periodically for looseness, oxidation or overheating signs, and replace components promptly if abnormalities are found.

R3-12E-Panel-mount-fuse-holder

Frequently Asked Questions

Q1: What fuse size does this panel fuse holder support?

A1: It is compatible with all standard 5×20mm glass and ceramic cartridge fuses, which is the most widely used small-size specification for low-voltage equipment and control circuit protection.

Q2: What are the rated current and voltage?

A2: The rated current is 10A, and the rated voltage is 250V for both AC and DC, covering most low-voltage electrical equipment protection scenarios.

Q3: What installation methods are available?

A3: It adopts a dual installation design, supporting both front panel mounting and PCB board mounting. You can choose the appropriate method according to your actual assembly requirements.

Q4: What material is the housing made of?

A4: The housing is made of bakelite with UL94 V0 flame retardant grade, featuring excellent high-temperature resistance, arc suppression and insulation performance.

Q5: What is the withstand voltage and insulation resistance?

A5: It supports 3000V AC power frequency withstand voltage, with insulation resistance above 100MΩ, providing high insulation strength and operational safety for low-voltage circuits.

Q6: What material are the terminals made of?

A6: The terminals are made of 0.5mm thick phosphor bronze, with high elasticity, contact resistance below 5mΩ, and stable clamping force after long-term use.

Q7: What are the main application fields?

A7: Widely used in switching power supplies, industrial control equipment, household appliances, test instruments, communication equipment and various low-voltage AC/DC circuit overcurrent protection.