INSTALL AT ION
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— Installation environment
Temperature The Tmax XT circuit-breakers can be used in environmental conditions where the ambient air temperature varies between -25°C and +70°C, and can be stored at temperatures between -40 °C and +70 °C. Circuit-breakers fitted with thermomagnetic trip units have their thermal element set for a reference tempe- rature. For temperatures other than the reference, a trip threshold variation must be taken into account. Electronic trip units do not undergo any variations in performance as the temperature varies, but, in the case of temperatures exceeding +40°C, the maximum setting for protection L (protection against overloads) must be reduced, as indicated in the derating graph, to take into account the heating phenomena which oc- cur in the copper parts of the circuit-breaker which the phase current passes through. For temperatures above +70°C the circuit-breaker performances are not guaranteed. Environmental conditions The Tmax XT circuit-breakers are designed to operate in environments with a pollution degree of 3 accor- ding to the IEC 60947-2 Standard classification. Altitude Up to an altitude of 2000m/6561 ft, the Tmax XT circuit-breakers do not undergo any alteration in their rated performances. As the altitude increases, the atmospheric properties are altered in terms of composition, dielectric resistance, cooling capacity and pressure. Therefore, some performance aspects of the circuit-bre- aker (e.g. the maximum rated operating voltage and the rated uninterrupted current) undergo derating.
Altitude
2000m/ 6561ft
3000m/ 9842ft
4000m/ 13123ft
5000m/ 16404ft
Rated employ voltage, Ue Rated uninterrupted current
[V AC] 600
540
468
408
% 100
98
93
90
Electromagnetic compatibility Protection is guaranteed in the presence of interference caused by electronic apparatus, atmospheric di- sturbances or electrical discharges by using the electronic trip units and the electronic residual current relea- ses. No interference with other electronic apparatus near the place of installation is generated either. This is in compliance with the IEC 60947-2 Annex B + Annex F Standards, European Directive No. 2014/30/EC re- garding EMC - electromagnetic compatibility and UL489 Standard.
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