Tripping Characteristics
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Motor protection circuit-breaker
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14 Tripping Characteristics
The tripping characteristic curves refer to a 3-pole load from cold state at an ambient
temperature of +20 °C and any position.
The deviation of the tripping time (from a current three times higher than the rated current)
is ±20 % maximum according to IEC/EN 60079-14.
The following tripping characteristic curves show the tripping time as a function of the
current ratio l
a
/I
e
.
Legend:
1) Multiples of the rated current
2) Tripping time
3) 2-pole
4) 3-pole
5) Electromagnetic tripping
05930E00