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[Schneider 40 amp automatic switch](https://www.automation24.ir/product-942/%D9%83%D9%84%DB%8C%D8%AF-%D8%A7%D8%AA% 25D9%88%D9%85%D8%A7%D8%AA%DB%8C%D9%83-%D8%A7%D8%B4%D9%86%D8%A7%DB%8C%D8%AF%D8 %B1-40-%D8%A2%D9%85%D9%BE%D8%B1)
### Automatic key:
In order to protect lighting facilities, industrial electricity, wire and cable and machines against overload and short circuit current, fuse, thermal switch or automatic switch is used. Maybe in some cases, the needs of the systems can be answered by a miniature key or a thermal key, but the many capabilities of automatic keys have increased the range of use of this key in the industry.
Automatic keys are classified into two categories: compact and air. Depending on the user's needs, both of the above categories can be used, but the main difference between these two categories is that compact automatic switches are made up to 1600 amps, and if an automatic switch with a higher current is desired, it should be of air switches. be used
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## Important features of automatic keys:
It is easy to adjust the current in these types of keys.
Miniature switches are available up to 63 amps, but automatic switches (compact type) are made up to 1600 amps.
There are more accessories that can be connected to the automatic switch.
The operation mode of automatic keys is performed in three areas. (error area, area one, area zero) but miniature or thermal switches have two areas zero and one.
Automatic keys have remote control capability.
## Things to consider when buying automatic keys:
1. The automatic key can be adjusted or it cannot be adjusted
2. Working current range
3. The number of disconnected and connected bridges
4. Short circuit breaking power
5. Its dimensions
6. Peripheral equipment
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