I. scope
This product is non-sparking Bell, stainless steel, suitable for industrial and mining enterprises, government agencies and organizations, public schools and equipment supporting the AC 50HZ, voltage to 220V circuit, make a call or alert, also applies to the family as the doorbell, alarm and more.

Second, normal working conditions:
1. altitude is not more than 2000 m
2. medium humidity not higher than + 40 degrees or below-25 degrees air temperature not more than 90% (when the temperature is at + 25 degrees)
3. in the air around them without flammable and corrosive gases or conductive dust and no significant shake and shock and vibration environments.
4. can work at rated voltage ± 10%, not more than 10 minutes of continuous service.
5. pollution grade 2, installation category II of the categories.

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