Fuse guides
Practical reading for engineers, maintenance teams and buyers who specify medium and high voltage fuses: how to choose one, how the ratings differ, what the standards define, and why fuses fail.
Selection guides
Medium-Voltage Fuse Selection Guide
How to choose between E-rated, R-rated, C-rated and loadbreak elbow fuses: what each class protects and what to know before specifying.
Solar & gPV Fuse RFQ Guide
The DC voltage, string current, format and standards information needed to quote a photovoltaic fuse, and why gPV is a distinct utilization category.
Time-Current Curves & I²t
How to read a fuse time-current curve, what pre-arcing and total let-through I²t mean, and how current limitation protects equipment under fault.
Transformers and motors
Which fuse protects which equipment, and how the E and R ratings differ.
E-Rated vs R-Rated Fuses: 7 Key Differences
How E-rated transformer fuses and R-rated motor fuses differ: C37.46 melting points, fuse class, what the number means, overload duty and substitution.
Standards, testing and maintenance
What the standards define, why fuses fail, and how to test, store and handle them.
Key Standards for Medium Voltage Fuses (IEEE, IEC, UL)
The IEEE C37 and IEC 60282 standards behind medium voltage fuses, what each covers, which editions are current, and where UL 248 and UL 2579 fit in.
Most Common Causes of Medium Voltage Fuse Failure
Why medium voltage fuses fail or open unexpectedly: back-up fuse overloads, inrush, heat, earlier faults, poor contacts, voltage and handling errors.
Capacitor fuse guide
42 in-depth articles on capacitor bank fusing, from how capacitor fuses work and how to size one to choosing a DENCO DNX or DNXC fuse by voltage class.
Capacitor fuse guide: understand, choose, specify
C ratings, case rupture, inrush, sizing and derating, voltage classes from 2.8 to 38 kV, and a DNXC selection table by kvar.
Still have a question?
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