Πώς να υπολογίσετε το Circuit Breaker Sizing

Τι είναι το Circuit Breaker Sizing;

Selects appropriate circuit breaker to protect circuits from overcurrent while allowing normal operation. Wrong sizing causes nuisance trips or fire risk.

Τύπος

Οδηγός βήμα προς βήμα

1. 1Calculate circuit maximum current
2. 2Breaker must exceed running current for motor inrush
3. 3Typical breaker = current × 1.25 (non-motor) or × 2.5 (motor)
4. 4Match breaker to wire ampacity (wire must handle breaker rating)
5. 5Select trip curve (A, B, C, D) for application

Worked Examples

Common Mistakes to Avoid

• ✕Oversizing breaker to avoid nuisance trips (creates fire hazard)
• ✕Using undersized wire for breaker rating

Frequently Asked Questions