First, calculate the value of the current of each branch
(1) Purely resistive loads, such as bulbs, electric heaters, etc., are directly divided by the indicated power by voltage, that is, the formula I = power/220v; For example, for a 20W bulb, the branch current I=20W/220=0.09A electric fan, electric iron, electric blanket, water heater&from=forum9" target="_blank"> electric water heater, electric heater, electric rice cooker, electric wok, vacuum cleaner, air conditioner, etc. are resistive loads.
How to choose a circuit breaker is a professional technical question. Briefly, you can choose from the following 6 points: 1. The first choice is based on the additional voltage, and the additional voltage should be the same. 2. The additional current of the circuit breaker should be greater than or equal to the additional current of the circuit used. 3. The additional breaking current of the circuit breaker should be greater than or equal to the short-circuit current of the circuit used. 4. Select according to environmental conditions, such as altitude, temperature, humidity, and select circuit breakers that meet the requirements. 5. Choose a circuit breaker with high quality and cost performance according to the brand. 6. For special breaking conditions, check the circuit breaker. However, different types of circuit breakers should be used for different loads.
Principles for purchasing Schneider circuit breakers:
1. Confirm the type and maintenance method of the circuit breaker according to the maintenance requirements of the line - confirm the selection of frame type, equipment type or current limiting type, etc.
2. The additional voltage UN of the circuit breaker should be equal to or greater than the additional voltage of the line to be maintained.
3. The additional voltage of the circuit breaker undervoltage tripper should be equal to the additional voltage of the line to be maintained.
4. The additional current of the circuit breaker and the additional current of the overcurrent tripper should be greater than or equal to the calculated current of the line to be maintained.
5. The ultimate breaking capacity of the circuit breaker should be greater than the effective 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 cooperate harmoniously, and the maintenance characteristics of the lower level should be located below the maintenance characteristics of the upper level and do not intersect.
7. The long-delay tripping current of the circuit breaker should be less than the continuous current promised by the wire.
After reading the above introduction of Schneider E9 and C65, you can know that these two circuit breakers have their own characteristics and advantages, so customers can buy according to their own needs, and must pay attention to the above points when purchasing, recognize the brand, and go to the regular store to buy, in order to ensure the quality of the product, and achieve safe electricity in life.
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