1, the level of accuracy: 2-4000 - a; 0.5 class; From 5000 to 10000 a. 1 class2, environmental conditions: - 40 ~ + 60 ℃, relative humidity is 95% or less (35 ℃)3, mechanical force resistance performance, can withstand the impact acceleration for seconds and frequency of 80 ~ 120 times per minute 6 hours transportation jolt.4, overload performance: 120% rated current, 2 hours.5, voltage drop: 50 mv 75 mv 100 mv.6, heat loads, temperature change after stabilization, rated current below 50 a does not exceed 80 ℃; More than 50 a rated current shall not exceed 120