ABB all products Example of curve reading
Example of curve reading
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Example 1 – XT3N 225 |
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Trip curves for distribution (thermal magnetic trip unit) |
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Let us consider an XT3N TMF In = 225A circuit-breaker. |
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According to the conditions the overload is found in; i.e., with |
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the circuit-breaker at thermal regime or not, thermal protection |
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tripping varies considerably. |
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152.7 s |
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For example, for an overload current 3xI1, the trip time is |
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40.2 s |
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between 152,7s and 40,2s for cold tripping and between 40,2s |
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and 6,9s for hot tripping. |
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For fault current values higher than 225A. Tthe circuit-breaker |
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trips with the instantaneous magnetic protection I3. |
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Example 2 – XT2H 125
Specific let-through energy curves
This figure figure shows a sample graph of the specific letthrough energy of the XT2H 125 circuit-breaker at a voltage of 220/230V.
The prospective symmetrical short-circuit current is indicated on the abscissas, whereas the values of the specific let-through energy expressed in A2s are shown on the ordinates.
The circuit-breaker lets through a value of I2t equal to 0, 42 · 10^6 · A2s relative to a short-circuit current of 14kA.
I2t [106 A2s]
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14 kA
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x Irms [kA]
4/2 SACE Tmax XT UL/CSA | US Technical Catalog
Example 3 – XT2L 125
Limitation curves
The figure at right gives the trend of the Limitation curves of the XT2L 125 In = 125A circuit-breaker.
The effective value of the prospective symmetrical short-circuit current is given on the abscissas of the diagram, whereas
the peak value corresponding to the prospective short-circuit current is indicated on the ordinates.
For a value current of 22kA, the XT2L 125 circuit breaker with a thermal magnetic trip unit In = 125A limits the peak prospective short-current current to 18kA at a voltage of 600V.
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18 kA |
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US Technical Catalog | SACE Tmax XT UL/CSA 4/3
Trip curves with thermal magnetic trip unit Trip curves for distribution
XT1 125 TMF In=15..30A |
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In=15A |
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In=20A |
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In=25A |
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In=30A |
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XT1 125 TMF In=60...100A |
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XT1 125 TMF In=35...50A |
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In=35A |
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In=40A |
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In=45A |
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In=50A |
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XT1 125 TMF In=125A |
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4/4 SACE Tmax XT UL/CSA | US Technical Catalog
XT2 125 TMF In=15...30A |
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In=15A |
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In=20A |
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In=25A |
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XT2 125 TMF In=60...70A |
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XT2 125 TMF In=35...50A |
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In=35A |
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In=40/50A |
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XT2 125 TMA In=80...100A |
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I3=5...10xIn |
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x I1 |
US Technical Catalog | SACE Tmax XT UL/CSA 4/5
Trip curves with thermal magnetic trip unit Trip curves for distribution
XT2 125 TMA In=110...125A |
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I3=5...10xIn |
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XT3 225 TMF In=60..100A
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XT3 250 TMF In=110..150A
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XT3 250 TMF In=160..225A
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x I1 |
4/6 SACE Tmax XT UL/CSA | US Technical Catalog
XT4 250 TMF In=25...50A |
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In=25A |
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In=30A |
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In=35A |
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In=40...50A |
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XT4 250 TMF In=80...100A |
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XT4 250 TMF In=60...70A |
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XT4 250 TMF In=110...150A |
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x I1 |
US Technical Catalog | SACE Tmax XT UL/CSA 4/7
Trip curves with thermal magnetic trip unit Trip curves for distribution
XT4 250 TMF In=160...225A |
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I3=10xIn |
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XT4 250 TMA In=80...100A |
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XT4 250 TMF In=250A |
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I3=10xIn |
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XT4 250 TMA In=110...150A |
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4/8 SACE Tmax XT UL/CSA | US Technical Catalog
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