Table
B/C/D Breaker Trip Curve Reference
B/C/D Breaker Trip Curve Reference reference with assumptions and boundary notes.
Reference boundary
Trip-curve terminology reference only. It does not select breakers, verify equipment compatibility, or approve coordination.
Reference table
Compare common miniature circuit breaker curve labels by instantaneous-trip range wording.
| Curve | Instantaneous range | Catalogue context | Boundary |
|---|---|---|---|
| B | 3 to 5 x rated current | low inrush miniature breaker curve reference | curve label reference only; manufacturer trip curves and equipment ratings govern use |
| C | 5 to 10 x rated current | moderate inrush miniature breaker curve reference | curve label reference only; manufacturer trip curves and equipment ratings govern use |
| D | 10 to 20 x rated current | higher inrush miniature breaker curve reference | curve label reference only; manufacturer trip curves and equipment ratings govern use |
Use notes
- Use this table for preliminary reference and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.