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- FAQ > Low-voltage Power Distribution Products > Low-voltage Circuit Breakers > Molded Case Circuit Breakers > Rating of a circuit breaker for transformers primary protection
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Rating of a circuit breaker for transformers primary protection
How does the rated current of a circuit breaker which is located at the primary side of a transformer determine?
Answer
When making a transformer to energize, a large inrush current may flow. The circuit breaker is therefore required to prevent unwanted trip.
The selection of the rated current of the circuit breaker shall satisfy both of the following conditions.
1. It shall be 1.1 times or more than the rated current of the transformer
2. Inrush current < Instantaneous tripping current of the circuit breaker
The selection of the rated current of the circuit breaker shall satisfy both of the following conditions.
1. It shall be 1.1 times or more than the rated current of the transformer
2. Inrush current < Instantaneous tripping current of the circuit breaker
- Product Name
- Molded Case Circuit Breakers
- Series
- WS-V
