Switch disconnectorsSwitch disconnectors
Function
Fuse monitoring
Fuse monitoring is used to detect, indicate and report faults. The electronic fuse monitoring devices are available in 2 versions.
EFM10 electronic fuse monitoring devices:
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For use up to 690 V AC
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Operational voltage < 20 V
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Display: Ready-to-run
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Individual fault display per phase
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1 CO contact as centralized fault signaling unit
EFM20/25 electronic fuse monitoring and line monitoring devices:
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EFM20 for use up to 690 V AC, EFM25 for use up to 440 V DC
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Operational voltage < 13 V (EFM20) < 20 V (EFM25)
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Test function
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Closed-circuit principle or open-circuit principle
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2 CO contacts as centralized fault signaling unit incl. line monitoring functions with phase failure detection (EFM20), undervoltage/overvoltage detection