UNM1A series circuit breakers and auxiliaries comply with the
following international standard:

IEC/EN 60947-1
Low-voltage switchgear and controlgear-Part 1:General rules

IEC/EN 60947-2
Low-voltage switchgear and controlgear-Part 2:Circuit-breakers

1)Ambient Temperature: Within the range of -5C+55℃ ( However, when the temperature exceed 40℃,it should be considered to reduce the capacity to use )
2) Relative Humidity:Within the range of 45~85%
3) Altitude:2,000m or less(However, if it exceeds 1000m, atmosphere correction through humidity test and withstand voltage test can be considered. )
4) Atmosphere where excessive steam, oil steam, smoke, dust, salt and other corrosive materials do not exist.

According to the pole:2-pole、3-pole、4-pole
According to the breaking capacity:S-type、H-type
According to the long-time current setting:Fix type、Adjustable type(0.8In~1.0In)