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CONTENTS
1.
2.
Introduction …………………………………………..………...……..4
Description of Operation ……………..……….........................….. 5
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Phase Overcurrent Protection [50/51]
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Earth Fault Protection [50N/51N]
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Circuit Breaker Failure Protection [50BF]
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Current Measurement
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Digital Input
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Programmable Output Contacts
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Internal Relay failure (IRF) Output
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Serial Communication
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Time-Current Characteristic Curves
3. Display and User Programming ………....................................... 16
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Four-digit Display
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Indicators
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Display under Normal Non-operating Condition
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Display under Start Condition
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Display under Trip Condition
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The RESET/ STEP Key
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The PROGRAM Key
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The UP and DOWN Key
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The SWITCH Key
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Programming the Protection Functions
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Programming the Soft Switches
4. Soft Switches ……………………................................................. 27
5. Connections ……………………..............................................…. 44
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Connection Terminals
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Connection Diagrams
6. Case Dimensions ………………………....................................... 48
7. Technical Data …………………………....................................… 49
8. Tests and Standards ………................................................…….52
9. Appendix A ……………...… …………...................................……54
10. Appendix B ………………………………................................……55