Page 9 - DIN Disconnectors

9

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Electronic Fuse Monitoring

3-pole

The Electronic Fuse Monitoring (EFM) is a fuse
blown indication device. The EFM unit has an
integrated potentional free relay (1NO, 1NC) for 1SEB000018
remote signal/alarm. It will be automatically reset
after the blown fuse has been replaced and the
green LED turns on again.

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The matrix below show all possible cases of indication
Fuse status Relay contacts
NO contact 13, 14 NO contact 11, 12
1. Closed Green Red
Open Closed Open Closed
Fuse OK X X
Fuses BLOWN X X

2. Open
Fuse OK X X
Fuses BLOWN X X

Power supply to the EFM unit from phase L2 and L3

The fuse monitor is connected to the gripping NOTE :
lugs of the fuses. • NH fuses with insulated gripping lugs can
not be used.
• The EFM unit requires that the supply side of
— the XLP should be on top of the switch.
Technical data
Min. operation voltage 290V -10%
Max. operation voltage 690V +10%
Operation temp. range -25/+80C
Operation time < 2 sec.
Power consumption < 3VA
Uimp. over a blown fuse 12,3kV
Uimp. between phases 9,8kV
Uimp. between main circuit / relay contacts 9,8kV
Dielectric test voltage input/output 3,5kV / 50Hz / 1 minute
Electrostatic Discharge EN 61000-4-2 +- 4kV
Electrical Fast Transient EN 61000-4-4 +- 4kV
Conducted Fast Transient EN 61000-4-6 10Vrms/150kHz-80MHz
Recommended cable size AWG 22-12/0,2-2,5 mm 2
EMC tested Yes
Relay:
Nominal current 8A
Max. switching voltage 240VAC, 24VDC