Table
Fuse Label Markings Decoder
Fuse Label Markings Decoder lookup table with assumptions and boundary notes.
Scope
Label-reading planning only. It does not select a fuse, verify holder compatibility, approve replacement, or replace fault-current study review.
Lookup table
Decode common fuse label fields such as ampere rating, voltage rating, class, interrupting rating, and time-delay markings.
Scroll sideways to keep row labels aligned with hidden columns.
| Marking | Meaning | Example | Boundary |
|---|---|---|---|
| A | Ampere rating | 30 A | Read directly from the fuse label; load and holder selection are separate checks |
| V AC / V DC | Voltage rating | 600 V AC | The circuit voltage and current type must be within the marked rating |
| Class | Fuse class or family | Class J, CC, RK1, RK5, L | Class markings do not by themselves confirm holder or equipment compatibility |
| IR / kA | Interrupting rating | 200 kA | Available fault-current study and equipment ratings remain separate checks |
| Time delay | Delay characteristic marking | TD, D, time-delay | Trip behavior depends on the fuse family and manufacturer time-current data |
| Current limiting | Current-limiting fuse marking | Current limiting | Coordination and let-through review require 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.