Experience in selecting circuit breakers – How to choose between C characteristics and D characteristics?
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When choosing a circuit breaker, there are C-type and D-type options. Experienced colleagues, based on your experience, how can I quickly determine which type should be selected? For example, (1) low-power motors, (2) sockets, (3) lighting fixtures, (5) speed regulators
1) Low-power motors: Select characteristic D. (2) Outlets: Select characteristic C. (3) Lamps: Select characteristic C. (5) Speed controllers: Select characteristic B
Reply to 2# liuei: Are there any experiences that can be used to make a judgment? Could you tell me how you make your judgments? Is it important to choose features?
The internationally recognized trip characteristics (curves) include: A, B, C, and D trip characteristics. Feature A: 2 times the rated current; rarely used, generally for semiconductor protection ； Characteristic B: 2~3 times the rated current, generally used for secondary circuit protection on the transformer side ； C characteristic: 5 to 10 times the rated current; this is the most commonly used characteristic, generally applied in building lighting and similar applications ； D characteristic: 10 to 20 times the rated current; generally used for power distribution. K characteristic (ABB patent) is mainly used in motor systems with a rated current of 40 A or less; the choice of circuit breaker characteristic is made based on these distinctions
Learned something from upstairs, now I know more, hehe
Reply to 4# jjli618: Hehe, thanks!