1. The number of poles for a circuit breaker should be determined based on the number of lines that need protection. For instance, in a typical residential single-phase electrical system, which consists of one neutral wire and one live wire forming a circuit, a two-pole breaker is chosen if both wires require protection. However, if the neutral wire does not need protection, a one-pole breaker can be selected.
2. The amperage rating of the circuit breaker should be based on the load of the circuit. For example, if the circuit’s carrying capacity is 20A and the rated operating current of the appliances is 10A, then the breaker’s amperage should be greater than 10A but less than 20A.
3. Determine the rated voltage, which for household electricity in China is typically 220V/230V for single-phase and 380V/400V for three-phase.
4. The type of instantaneous protection should be identified based on the resistance type of the appliances in the circuit. There are three types of instantaneous protection, corresponding to current protection multiples of B: 3~5In, C: 5~10In, and D: 10~14In (where In is the rated current). For simple incandescent lights, B-type protection may suffice, general appliances can be protected with C-type, and air conditioning units may require D-type protection.
If it is a special occasion, it needs to be considered on a case-by-case basis.
MuTai Electrical Group is a professional manufacturer of miniature circuit breakers with over a decade of production experience. Our products are known for their reliable quality and stable performance, widely used in homes, businesses, and industrial settings. We are dedicated to providing our customers with high-quality circuit breakers that ensure electrical safety.
Post time: Mar-27-2024
