Table
Current-Limiting Fuse Classes
Current-Limiting Fuse Classes lookup table with assumptions and boundary notes.
Scope
Current-limiting terminology planning only. It does not determine peak let-through, equipment protection, coordination, or replacement suitability.
Lookup table
Compare common fuse classes that are commonly labelled or described as current-limiting in manufacturer literature.
Scroll sideways to keep row labels aligned with hidden columns.
| Fuse class | Current-limiting lookup | Common voltage labels | Curve boundary | Boundary |
|---|---|---|---|---|
| Class J | Commonly described as current-limiting | 250 V, 600 V | Curve review needed for actual let-through | Current-limiting wording does not replace manufacturer curves |
| Class CC | Commonly described as current-limiting | 600 V | Curve review needed for actual let-through | Current-limiting wording does not replace manufacturer curves |
| Class RK1 | Often current-limiting in comparison literature | 250 V, 600 V | Curve review needed for actual let-through | Current-limiting wording does not replace manufacturer curves |
| Class RK5 | Often current-limiting in comparison literature | 250 V, 600 V | Curve review needed for actual let-through | Current-limiting wording does not replace manufacturer curves |
| Class L | Commonly current-limiting in manufacturer literature | 600 V | Curve review needed for actual let-through | Current-limiting wording does not replace manufacturer curves |
Notes
- Check table values for preliminary lookup and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.