Issue:
What is the endurance rating for the thermal magnetic breakers?
Product Line:
Circuit Breakers
Resolution:
Circuit breakers are tested to UL489 and CSA 22.2. For endurance, both thermal-magnetic and electronic circuit breakers must successfully complete the number of operations shown in the below table.
NOTES:
Circuit breakers are not tested until they fail, so the maximum number of operations is not known.
Environmental factors affect the life of a breaker, so the number of test operations in the table should not be interpreted as a guaranteed number in actual use.
What is the endurance rating for the thermal magnetic breakers?
Product Line:
Circuit Breakers
Resolution:
Circuit breakers are tested to UL489 and CSA 22.2. For endurance, both thermal-magnetic and electronic circuit breakers must successfully complete the number of operations shown in the below table.
- Power factor shall be 0.75 to 0.80 lagging.
- Starting in the open position, the breaker is closed, then opened (this counts as one operation)
- The Full Load Operations Test is done at rated current and voltage
- The No Load Operations Test is done following the Full Load Test
| Frame Size in Amperes | Full Load Operations | No Load Operations |
| 0-100 | 6,000 | 4,000 |
| 101-225 | 4,000 | 4,000 |
| 226-600 | 1,000 | 5,000 |
| 601-800 | 500 | 3,000 |
| 801-2500 | 500 | 2,000 |
| 2501-4000 | 400 | 1,000 |
NOTES:
Circuit breakers are not tested until they fail, so the maximum number of operations is not known.
Environmental factors affect the life of a breaker, so the number of test operations in the table should not be interpreted as a guaranteed number in actual use.
Released for: Schneider Electric USA
