| Type of Motor | Nontime Delay Fuse | Dual Element (TD) Fuse | Instantaneous Trip Breaker | Inverse Time Breaker |
|---|---|---|---|---|
| Single-Phase | 300% | 175% | 800% | 250% |
| AC Polyphase | 300% | 175% | 800% | 250% |
| Squirrel Cage | 300% | 175% | 800% | 250% |
| Design B Energy Eff. | 300% | 175% | 1100% | 250% |
| Synchronous | 300% | 175% | 800% | 250% |
| Wound Motor | 150% | 150% | 800% | 150% |
| DC | 150% | 150% | 250% | 150% |
| Type of Motor | Nontime Delay Fuse | Dual Element (TD) Fuse | Instantaneous Trip Breaker | Inverse Time Breaker |
|---|---|---|---|---|
Enter the FLC, Full Load Current, of your motor.
Look in NEC Tables 430.247, 430.248, 430.249, or 430.250 to find your values.
The white table shows the calculated maximum standard fuse and breaker sizes, shown in amperes,
from the values listed in NEC Table 240.6(A). The gray table is from NEC Table 430.52(C)(1).