SACE TMAX XT UL/CSA LOW VOLTAGE MOLDED CASE C I RCUI T- BRE AKERS UL4 89 AND CSA C2 2 . 2 STANDARDS
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— Temperature performance
Circuit-breaker with magnetic only or electronic trip units and switch- disconnectors The electronic overcurrent trip units do not undergo any variations in performance as the temperature var- ies. However, even though heating does not affect the trip thresholds of the electronic trip units, in the case of temperatures exceeding +40°C it is advisable to reduce the maximum L (protection against overloads) setting to protect the copper parts of the circuit-breaker against high temperatures. The same considerations can be made for the switch-disconnectors and magnetic only circuit-breakers. The table below shows the maximum value at which, with terminals and lugs, the threshold of I1 of the over- current protection (L) must be set according to the ambient temperature.
40°C
50°C
60°C
70°C
Imax [A]
Imax [A]
Imax [A]
Imax [A]
XT1
F P F
M-MCS M-MCS
125 125 125 125 225 225 250 250 400 400 600 600 800 800 800 800
112 106 112 106 201 191 224 213 400 368 600 497 800 736 800 800
97 88 97 88
79 70 79 70
XT2
M-ELT-MCS
P/W M-ELT-MCS
XT3
F P F
M-MCS M-MCS
174 158 194 177 362 333 572 453 724 666 800 800 949 953 980 980
142 126 158 140 319 294 512 405 638 587 755 716 894 853 849 849
XT4
M-ELT-MCS
P/W M-ELT-MCS
XT5 400
F
M-ELT-MCS
P/W M-ELT-MCS
XT5 600
F
M-ELT-MCS
P/W M-ELT-MCS
XT6
F
ELT-MCS
W ELT-MCS
XT7 800
F
ELT-MCS
W ELT-MCS
XT7 1000
F
ELT-MCS
1000 1000 1200 1200
1000 1000 1095 1095
W ELT-MCS
XT7 1200
F
ELT-MCS
W ELT-MCS
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