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Thermal and magnetic protection circuit breakers provided short circuit protection by instantaneous tripping devices. In the magnetic field formed by the coil with current，the moving armature and stationary core overcomed the spring force and engage under the influence of electromagnetic force，thereby pushing the circuit breaker mechanism to operate and causing the product tripping. During the entire process，only when the electromagnetic force reaches a certain value could be the moving armature and stationary core reliably engage at the preset current value. In actual engineering design，in order to simplify the design and calculation process，issues such as magnetic leakage may be ignored. Therefore，the theoretical calculated magnetic attraction force，i.e. spring reaction force，will be smaller than the preset target. By analogy calculation method，it is possible to directly eliminate the influence of magnetic leakage and part manufacturing accuracy on the test results during the manufacturing process，and complete the design of the instantaneous release device once. Finally，practical application cases were used to illustrate how to accurately and quickly design an instantaneous release devices through a combination of theoretical calculations and experiments.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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