Comprehensive Circuit Protection Engineering & Custom Service From EssFuse
As a professional manufacturer of DC fuses, automotive fuses, energy storage fuses and matching fuse holders, EssFuse delivers one-stop circuit protection solutions for system integrators, electrical engineers and OEM manufacturers worldwide. Our service covers the whole project cycle: product selection guidance, prototype sample verification, customized development, UL certification support, pre-compliance testing, mass production and after-sales technical support.
We supply a complete product portfolio including printed circuit board fuse holder, circuit board fuse holder, bolt fuse, bolt fuse holder, energy storage fuse, high voltage DC fuse, automotive fuse and semiconductor aR/gR high-speed fuses compliant with UL 248-13, UL 248-14, IEC 60269 standards.
1. Pre-Sales Technical Support & Product Selection Service
Selecting an unsuitable fuse easily leads to continuous overheating, premature blowing or failure to break short-circuit current, which brings huge safety risks to energy storage systems, electric vehicles and industrial converters.
Our professional engineers support customers to complete parameter confirmation: rated voltage, continuous operating current, short-circuit breaking capacity, time-current characteristic, I²t value, ambient temperature derating, installation dimension and terminal matching.
Common application scenarios: battery energy storage system (BESS), new energy vehicle power circuit, solar inverter, industrial DC drive, UPS, charging pile and control board PCB protection.
2. Sample Test & Pre-Certification Laboratory Support
We provide prototype samples for customer bench test, temperature rise test, overload test and short-circuit test.
For customers preparing UL certification (UL248 series), we support internal pre-test:
- Temperature rise & voltage drop test of fuse and fuse holder
- 2×In overload time-current characteristic test for aR / gR semiconductor fuses
- Short-circuit breaking performance verification
- Ceramic fuse assembly matching test (quartz sand filling, end cap sealing, resistance consistency) Pre-test effectively avoids failure during UL witness testing and saves certification cycle and cost.
3. Custom Development Service
If standard specifications cannot match your system layout or protection requirements, EssFuse supports customized development:
- Custom fuse element design: adjust overload fusing time, cold resistance and temperature rise performance
- Custom bolt fuse dimensions, terminal spacing, ceramic housing structure
- Custom printed circuit board fuse holder, special terminal structure
- Special voltage grades, high vibration resistant construction for vehicle-grade projects All customized products can cooperate with customers to complete UL, cUL, CE, RoHS, REACH certification.
4. Certification Documentation Service
We provide complete technical documents required for global market access:
Datasheet, time-current curve, I²t data, temperature rise test report, production test specification, UL certificate file.
Main applicable standards:
UL248-13 (aR / gR semiconductor fuses), UL248-14 automotive fuses, IEC 60269, ISO 20934 vehicle DC fuse standard.
5. Mass Production & Stable Supply Service
After sample confirmation, we arrange standardized mass production, strictly control consistency of fuse resistance, fusing characteristic and assembly quality. Short lead time for regular models, flexible production arrangement for urgent orders, supporting global sea & air shipping.
6. After-Sales Technical & Quality Service
When customers encounter abnormal fuse operation in field application, our engineering team provides rapid analysis within 24 hours:
Abnormal overheating, early blowing, failure to break short-circuit fault, mismatch between fuse and fuse holder. We analyze root causes and provide targeted optimization solutions.
Frequently Asked Questions
1: What is the difference between aR and gR high-speed fuses under UL248-13?
A: aR fuses protect semiconductor devices only against short-circuit; gR fuses provide both overload and short-circuit protection for semiconductor circuits. Their 2×In overload fusing time requirements are different, which directly affects UL certification test results and short-circuit breaking capacity.
2: Can printed circuit board fuse holder be matched with high DC breaking capacity fuses?
A: PCB fuse holder must match the rated voltage and breaking capacity of the fuse. Improper matching will cause arc overflow and housing damage during short-circuit breaking.
3: Are bolt-on fuses suitable for energy storage high-current DC circuits?
A: Bolt fuse design provides low contact resistance, stable connection under vibration, widely used in 48V~1500VDC energy storage, EV main circuit protection.
4: Can you adjust the 2 times rated current fusing time of the fuse for UL testing?
A: We can adjust fuse element structure and internal filling formula to optimize overload characteristic, and complete internal pre-test to improve the passing rate of official UL witness test.
Contact Our Engineers
If you need fuse selection, sample request, custom development or certification technical consultation, contact EssFuse professional team for circuit protection solutions.
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