EssFuse manufactures a comprehensive range of DC and AC fuses including:

• High-voltage DC fuses (500V-1500V) for EV, ESS and solar
• ANL bolt-down fuses (20A-500A) for automotive and marine
• High-speed aR/gR semiconductor fuses (UL 248-14)
• gPV photovoltaic fuses for solar strings
• PCB fuse holders and panel mount fuse holders
• British standard fuses and semiconductor fuses

Browse our full product catalog for details.

Our fuses cover a wide voltage range:

• Low voltage: 32V, 48V, 80V DC (automotive, auxiliary)
• Medium voltage: 250V, 500V, 690V AC/DC
• High voltage: 750V, 1000V, 1500V DC (EV, ESS, utility solar)
• Custom voltages: up to 4200V DC available on request

Always verify the DC voltage rating on the specific product datasheet, as DC ratings differ from AC ratings.

Current ratings range from 2A to 3000A depending on the fuse series:

• PCB / blade fuses: 2A-40A
• MIDI / MEGA fuses: 30A-500A
• ANL fuses: 20A-800A
• High-voltage DC fuses: 32A-800A
• Industrial / semiconductor: 2A-3000A

Custom current ratings outside standard ranges can be developed for OEM projects.

Yes. We offer matching fuse holders for all our fuse types, including:

• PCB mount fuse holders (through-hole and SMD)
• Panel mount fuse holders
• Bolt-down ANL fuse holders
• Automotive fuse blocks
• High-voltage DC fuse holders with touch-safe design

Contact us for compatible holder recommendations for your specific fuse model.

Fuse selection requires matching five key parameters:

1. Voltage rating: ≥ system maximum voltage (DC rating for DC circuits)
2. Current rating: 1.25-1.5× continuous operating current
3. Breaking capacity: > maximum available fault current
4. Time-current curve: coordinated with other protective devices
5. Certification: appropriate standard (UL, IEC, etc.)

Our technical blog has detailed selection guides, or contact our engineers for free selection support.

AC and DC fuses are not interchangeable. AC arcs naturally extinguish at current zero-crossing (100-120 times per second), while DC arcs have no zero-crossing and are much harder to interrupt. DC fuses use specialized arc-quenching materials and longer arc chambers. Always use a fuse with an explicit DC voltage rating for DC circuits — the AC rating does not apply.

Breaking capacity (interrupting rating) is the maximum short-circuit current a fuse can safely interrupt without rupturing. If the fault current exceeds the breaking capacity, the fuse cannot extinguish the arc and may rupture, catch fire, or weld shut. It is more critical than the current rating. Calculate available fault current (I = V/Z) and select a fuse with breaking capacity exceeding that value (with 25% margin). Learn more in our breaking capacity guide.

The first letter indicates range: g = full-range (overload + short-circuit), a = partial-range (short-circuit only). The second letter(s) indicate application:

• gG: general-purpose full-range (cable/circuit protection)
• aR: partial-range semiconductor protection (ultra-fast, short-circuit only)
• gR: full-range semiconductor protection
• gPV: full-range photovoltaic (designed for low DC fault currents in solar)

See our fuse class comparison guide for full details.

Most EssFuse fuses operate within -40°C to +85°C ambient temperature. Some high-temperature models (PPS material) are rated up to +125°C. Note that fuse current ratings must be derated at high ambient temperatures — refer to the temperature derating curve in the product datasheet.

Our fuses are certified to multiple international standards:

• UL: UL 248-1, UL 248-11, UL 248-13, UL 248-14, UL 248-19
• IEC: IEC 60269-1, IEC 60269-4, IEC 60269-6
• Regional: CE, TUV, CQC
• Automotive: USCAR-2 vibration testing (selected models)

Specific certifications vary by product series — check the individual product datasheet or contact us for certification documents.

Yes. We can pursue UL recognition or listing for custom/OEM fuse designs through our established UL certification process. Timeline is typically 8-16 weeks depending on the standard and testing requirements. Contact our engineering team to discuss certification requirements for your project.

Yes, all EssFuse products are RoHS compliant and meet REACH SVHC requirements. We can provide RoHS certificates, REACH declarations, and material composition reports (including conflict minerals statements) upon request.

• Standard catalog models: 100 pieces
• Custom / OEM fuses: 500-1000 pieces (depends on specification)
• Samples: 1-10 pieces available for evaluation (free or at cost depending on model)

We understand project timelines — contact us to discuss flexible MOQ options for your specific needs.

• In-stock standard products: 3-5 business days
• Standard production (not in stock): 10-15 working days
• Custom / OEM orders: 15-25 working days
• Expedited: available for urgent orders (surcharge may apply)

Lead times are from order confirmation and receipt of deposit/payment. We provide regular production updates for custom orders.

We ship worldwide via:

• Express: DHL, FedEx, UPS (3-7 days, for samples and small orders)
• Air freight: 5-10 days (for medium orders)
• Sea freight: 25-40 days (for large volume orders, most economical)
• Customer’s forwarder: we can ship to your designated freight forwarder

Shipping cost is calculated based on weight, volume and destination. We provide competitive shipping rates through our logistics partners.

• Sample / small orders: 100% T/T in advance, PayPal, Western Union
• Production orders: 30% T/T deposit, 70% balance before shipment
• Large / established customers: negotiable terms (L/C at sight, etc.)

All prices are quoted in USD. We provide proforma invoices with bank details for payment.

EssFuse offers a 24-month warranty from date of shipment for all products against manufacturing defects. Fuses that fail under rated operating conditions due to material or workmanship defects will be replaced free of charge. The warranty does not cover damage from misuse, overcurrent beyond rating, improper installation, or normal wear. Contact us for warranty claims and RMA processing.

Yes. We have extensive OEM/ODM experience serving global automotive, EV, energy storage and industrial customers. We can customize:

• Voltage and current ratings
• Physical dimensions and terminal styles
• Breaking capacity and time-current characteristics
• Branding and packaging (your logo, part numbers)
• Material specifications (high-temperature PPS, etc.)
• Certification to specific standards

Contact us with your specification requirements for a custom solution.

To provide an accurate custom fuse quote, please provide:

• Rated voltage (AC/DC) and current
• Breaking capacity requirement
• Time-current characteristic (fast-acting, time-delay, etc.)
• Physical dimensions or mounting style
• Terminal type and material
• Required certifications (UL, IEC, CE, etc.)
• Operating temperature range
• Annual forecast quantity
• Any applicable drawings or reference samples

The more detail you provide, the faster we can develop a solution. Request a custom quote →

Typical custom development timeline:

1. Specification review & quote: 3-5 working days
2. Prototype development: 15-25 working days
3. Sample approval: customer testing (varies)
4. Certification (if required): 8-16 weeks (UL/IEC)
5. Mass production: 15-25 working days after approval

Total time from specification to mass production is typically 2-4 months, depending on complexity and certification requirements. We provide regular progress updates throughout the development process.

Yes. We offer full OEM branding including:

• Custom laser marking or printing on fuse bodies (your logo, part number, ratings)
• Custom packaging (boxes, labels, barcodes)
• Custom part numbering system
• Datasheets with your branding
• Certificate of Conformity with your company details

Minimum order quantities apply for custom branding — typically 500-1000 pieces depending on the product.