Schneider low-voltage circuit breaker selection

Create Date: 2024-8-30 12:03:23|Source: Schneider/Schneider

1. Determine the type and maintenance situation of Schneider circuit breaker according to the maintenance requirements of the line, and determine the selection of frame type, device type or current limiting type. Generally speaking, the Schneider frame circuit breaker can break the short-circuit current with a large device type and a large volume. Generally, non-selective two-stage maintenance (overload delay and short-circuit instantaneous maintenance) is used for branch lines, and device-type circuit breakers are mostly selected; The branch line selects overload delay and short-circuit short-delay maintenance, and can choose non-selective two-stage or selective three-stage maintenance, depending on the requirements of its level cooperation; The maintenance of the trunk line (power supply head) is the main maintenance, and the main circuit breaker should be selected in line with the criteria of reducing the scale of failure and maintaining reliable maintenance.

Schneider low-voltage circuit breaker selection

Schneider low-voltage circuit breaker selection

2. The additional voltage of the Schneider circuit breaker should be equal to or greater than the additional voltage of the line to be maintained.

3. The additional voltage of Schneider circuit breaker and undervoltage tripper should be equal to the additional voltage of the line to be maintained.

4. The additional current of Schneider circuit breaker and overcurrent tripper should be greater than or equal to the accounting current of the line to be maintained.

5. The limit segmentation of the circuit breaker should be greater than the value of the large short-circuit current of the line.

6. The maintenance characteristics of the upper and lower circuit breakers in the distribution line should be coordinated and cooperated, and the maintenance characteristics of the lower level should be located below the upper maintenance characteristics and do not intersect.

7. The long-delay trip current of the circuit breaker should be less than the allowable continuation current of the wire.

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