What are the possible long time amperage settings on a STR23SP trip unit?
Product Line:
Molded Case Circuit Breaker
Resolution:
Use formula: Desired amperage / In = In multiplier.
Then look at the table below for the In multiplier computed or the nearest multiplier.
Set the Io and Ir dials to the values corresponding the In multiplier.
Table. All possible In multipliers for all combinations of Io and Ir dials
In multiplier = Io * Ir
| In multiplier | Io | Ir |
| 1 | 1 | 1 |
| 0.98 | 1 | 0.98 |
| 0.95 | 1 | 0.95 |
| 0.93 | 1 | 0.93 |
| 0.9 | 0.9 | 1 |
| 0.9 | 1 | 0.9 |
| 0.882 | 0.9 | 0.98 |
| 0.88 | 1 | 0.88 |
| 0.855 | 0.9 | 0.95 |
| 0.85 | 1 | 0.85 |
| 0.837 | 0.9 | 0.93 |
| 0.81 | 0.9 | 0.9 |
| 0.8 | 0.8 | 1 |
| 0.8 | 1 | 0.8 |
| 0.792 | 0.9 | 0.88 |
| 0.784 | 0.8 | 0.98 |
| 0.765 | 0.9 | 0.85 |
| 0.76 | 0.8 | 0.95 |
| 0.744 | 0.8 | 0.93 |
| 0.72 | 0.8 | 0.9 |
| 0.72 | 0.9 | 0.8 |
| 0.704 | 0.8 | 0.88 |
| 0.7 | 0.7 | 1 |
| 0.686 | 0.7 | 0.98 |
| 0.68 | 0.8 | 0.85 |
| 0.665 | 0.7 | 0.95 |
| 0.651 | 0.7 | 0.93 |
| 0.64 | 0.8 | 0.8 |
| 0.63 | 0.63 | 1 |
| 0.63 | 0.7 | 0.9 |
| 0.6174 | 0.63 | 0.98 |
| 0.616 | 0.7 | 0.88 |
| 0.5985 | 0.63 | 0.95 |
| 0.595 | 0.7 | 0.85 |
| 0.5859 | 0.63 | 0.93 |
| 0.567 | 0.63 | 0.9 |
| 0.56 | 0.7 | 0.8 |
| 0.5544 | 0.63 | 0.88 |
| 0.5355 | 0.63 | 0.85 |
| 0.504 | 0.63 | 0.8 |
| 0.5 | 0.5 | 1 |
| 0.49 | 0.5 | 0.98 |
| 0.475 | 0.5 | 0.95 |
| 0.465 | 0.5 | 0.93 |
| 0.45 | 0.5 | 0.9 |
| 0.44 | 0.5 | 0.88 |
| 0.425 | 0.5 | 0.85 |
| 0.4 | 0.5 | 0.8 |
Released for: Schneider Electric USA
