Instantaneous Protection
Presentation
Instantaneous protection on MicroLogic 6 E-M trip units protects all types of motor applications against very high intensity short-circuit currents.
Operating Principle
Instantaneous protection is fixed: the pickup value is determined by the trip unit rating. Protection is instantaneous.
Tripping curve:
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The instantaneous protection parameters are:
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Ii Pickup Value
The Ii pickup value is directly determined by the trip unit In rating and is in x In.
Ii pickup value according to the MicroLogic trip unit In rating (accuracy range +/-10%).
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In rating (A) |
25 |
50 |
80 |
150 |
220 |
320 |
500 |
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Instantaneous pickup (A) |
425 |
750 |
1200 |
2250 |
3300 |
4800 |
7500 |
The hold time is 0 ms.
The maximum breaking time is 30 ms.