6x30mm Panel Fuse Holder | 20A 250V Industrial Grade Fuse Base
Industrial grade 6x30mm panel fuse holder with PBT UL94 V0 flame retardant housing and 0.8mm thick phosphor bronze terminals, 20A 250V/125V AC/DC rated, 3000V withstand voltage, designed for industrial power supplies, control equipment and distribution circuit overcurrent protection.
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The 6x30mm panel fuse holder is a medium-current panel-installed circuit protection component for low-voltage electrical systems. This 6x30mm panel fuse holder adopts high-quality PBT insulating base paired with 0.8mm thick phosphor bronze conductive terminals, delivering higher current carrying capacity, stable contact and reliable overcurrent protection for AC and DC circuits. With standard panel cutout design and flame retardant housing, it is widely used in industrial control equipment, switching power supplies, power distribution units and instrumentation panels.
Core Product Features
- Compatible with standard 6×30mm glass and ceramic cartridge fuses, covers mainstream low-voltage medium-power protection specifications
- Rated 20A at 250V/125V AC/DC, higher current carrying capacity for medium-power circuit protection
- PBT engineering plastic housing, UL94 V0 flame retardant grade, excellent insulation and high temperature resistance
- 0.8mm thick phosphor bronze terminals, reinforced structure, 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
- Threaded panel mount structure, standard cutout size, easy front-panel fuse replacement without opening enclosure
- Fully RoHS compliant, meets global electronics safety and environmental protection requirements
Compared with 15A small-size panel fuse holders, this model adopts 0.8mm thickened terminals with higher current carrying capacity, which is more suitable for medium-power industrial power supply and control circuits. Its PBT flame retardant housing adapts to the working environment of various indoor electrical equipment, and is a standard protection solution for low-voltage control circuits and power supply units.
Full Technical Specifications
| Specification Item | Parameter Value |
|---|---|
| Model | R3-55A |
| Compatible Fuse | 6 × 30mm glass / ceramic cartridge fuse |
| Rated Current | 20A |
| Rated Voltage | 250V / 125V AC / DC |
| Breaking Capacity | 50A |
| Power Frequency Withstand Voltage | 3000V AC |
| Housing Material | PBT, UL94 V0 flame retardant |
| Terminal Material | 0.8mm thick phosphor bronze |
| Contact Resistance | ＜ 5 mΩ |
| Insulation Resistance | ＞ 100 MΩ |
| Mounting Method | Panel mount, threaded nut fixing |
Selection & Application Guidance
When selecting a 6x30mm panel fuse holder, first confirm the fuse size, system rated voltage and operating current. For medium-power circuits above 15A, this 0.8mm thickened terminal model is recommended for higher current carrying capacity and lower temperature rise. Choose a 6x30mm 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 equipment requiring front-panel fuse replacement, panel mount models are the preferred choice as they allow quick fuse replacement without opening the equipment enclosure. 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
- Industrial control panels and medium-power automation equipment circuits
- Switching power supplies, industrial power modules and power distribution units
- Test instruments and laboratory power supply circuits
- Household appliances and medium-power electrical equipment
- Communication equipment and network power supply systems
- LED lighting drivers and low-voltage power modules
- Medical equipment auxiliary circuits and control systems
Installation & Maintenance Instructions
1. Select a 6x30mm cartridge fuse with correct current and voltage rating according to circuit protection requirements.
2. 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. Connect circuit wires tightly to the rear terminals and apply proper insulation treatment to prevent short circuit hazards.
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.
Frequently Asked Questions
Q1: What fuse size does this panel fuse holder support?
A1: It is compatible with all standard 6×30mm glass and ceramic cartridge fuses, which is a widely used specification for low-voltage medium-power circuit protection.
Q2: What are the rated current and voltage?
A2: The rated current is 20A, and the rated voltage supports 250V and 125V for both AC and DC, covering most medium-power electrical equipment protection scenarios.
Q3: What material is the housing made of?
A3: The housing is made of PBT engineering plastic with UL94 V0 flame retardant grade, featuring excellent insulation performance, high temperature resistance and flame retardant capability.
Q4: What is the withstand voltage and insulation resistance?
A4: It supports 3000V AC power frequency withstand voltage, with insulation resistance above 100MΩ, providing high insulation strength and operational safety for low-voltage circuits.
Q5: What material and thickness are the terminals?
A5: The terminals are made of 0.8mm thick phosphor bronze, with reinforced structure, high elasticity, contact resistance below 5mΩ, and stable clamping force for long-term use.
Q6: What mounting method does it adopt?
A6: It adopts panel mount design with threaded nut fixing structure, which can be directly installed on equipment front panels and control cabinet surfaces, with firm installation and convenient daily maintenance.
Q7: What are the main application fields?
A7: Widely used in industrial control equipment, switching power supplies, test instruments, household appliances, communication equipment and various medium-power low-voltage AC/DC circuit overcurrent protection.
