How to choose Schneider Circuit Breaker?

First calculate the current value of each branch

Pure resistive load, such as light bulbs, electric heaters, etc., with the indicated power directly divided by the voltage, the formula I= power /220v; For example, 20w light bulbs, branch current I=20W/220=0.09A electric fans, electric irons, electric blankets, water heaters, electric heaters, electric cookers, electric frying pans, vacuum cleaners, air conditioners, etc., are resistive loads.

How to select circuit breakers is a professional technical problem. In brief, it can be selected from the following 6 points: 1, the primary basis for additional voltage selection, additional voltage should be common. 2. The extra current of the circuit breaker shall be greater than or equal to the extra current of the circuit used. 3. The additional breaking current of the circuit breaker shall be greater than or equal to the short circuit current of the circuit used. 4. Select circuit breakers that meet the requirements according to environmental conditions, such as altitude, temperature and humidity. 5, according to the brand selection of high quality, cost-effective circuit breaker. 6. Check the circuit breaker for special breaking cases. However, different types of circuit breakers should be used for different loads.

The principles of purchasing Schneider circuit breakers:

1. Confirm the type and maintenance mode of circuit breaker according to the maintenance requirements of the line -- confirm the selection of frame type, equipment type or limited flow, etc.

2. The extra voltage UN of the circuit breaker shall be equal to or greater than the extra voltage of the line being maintained.

3. The extra voltage of the circuit breaker undervoltage trip device shall be equal to the extra voltage of the line being maintained.

4. The extra current of the circuit breaker and the excess current of the overcurrent trip device shall be greater than or equal to the calculated current of the line being maintained.

5. The limit breaking capacity of the circuit breaker should be greater than the maximum value of the circuit's large short circuit current.

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

7. The long delay trip current of the circuit breaker should be less than the continuous current allowed by the wire.

After reading the introduction of Schneider e9 and c65 above, we can know that these two types of circuit breakers have their own characteristics and advantages, so customers can buy according to their own needs, and they must pay attention to the above points when buying, recognize the brand clearly, and go to regular stores to buy, so as to ensure the quality of products and ensure the safe use of electricity in daily life.