1. Circumstance temperature -5º C~ +40º C, average temperature not exceeding 35º C.
2. Altitude above sea level less than 2000 m.
3. Humidity not exceeding 50% at 40º C and not exceeding 90% at 25º C.
4. Installation class II or III.
5. Pollution class II.
6. Installation method DIN Rail mounting type.
7. The external magnetism shall not be more than 5 times of terrestrial one.
8. Product shall be installed vertically at the place where there shall be no severe impact and vibration. The product is switched on when the handle is at upper position.