1. Altitude: no more than 2000m;
2. Ambient temperature: -50°C~+40°C, the average value of 24h does not exceed 35°C;
3. Relative humidity: no more than 50% when the highest temperature is +40°C, the maximum The relative humidity is 90% (20°C). Special measures must be taken for condensation on the product due to temperature changes;
4. Pollution level: Level 3;

In addition to overload protection and phase loss protection, this relay also has the following structural features: 1. Temperature compensation structure;
2. Action flexibility check;
3. Convertible manual reset or automatic reset device;
4. Manual disconnection A device with normally closed contacts.