This product is in compliance with the requirements of standards such as IEC60439-1,GB7251, JB/T5877, ICE439, etc., and is suitable for power systems with a rated voltageof 380-600V and alternating current of 50-60Hz, for the purpose of accepting and distributing electrical energy, and for controlling, protecting, and detecting circuits. Thisproduct is designed for indoor use. Usage environment 1.Lower than 2,000 meters in elevation.2.Environmental Temperature: not higher than +40°C, not lower than -5°C, with amean temperature not higher than +35°C within 24 hours.3.Relative Humidity: not more than 50% at the maximum temperature of +40°C, andcomparatively higher relative humidity is allowed at lower temperatures.4.The inclination to the vertical plane during the device installation shall not exceed5°.5.The device shall be installed in a place free from severe vibration and impact, and ina location where the electrical components are not subject to corrosion.6.Special requirements from the user can be negotiated and resolved with our company