Eaton ARCON 2.0 Series, Operation And Configuration Instructions. Technical Description

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9.2.1. ARC-EM/2.0
The master unit is designed for fl ush mounting. Spacing adapters for reducing the installation
depth are available on request.
Figure: Mounting the master unit ARC-EM/2.0
Wiring of the master unit, overview
The master unit can be connected to the following:
• secondary circuits of the current transformers of the switchgear
• the trip circuits of the circuit breakers
• alarm circuits
• auxiliary supply circuits
• protective earthing
• connections to I/O units (data communication and auxiliary supply)
• connections to other master units or arc quenching device
NOTE! The auxiliary supply connection is different to ARC-EM In ARC-EM/2.0 the auxiliary supply is
connected to terminals X3:17 and X3:18.
Wiring secondary circuits of the current transformers
Connect the secondary circuits of the current transformers to the following screw connectors
in the back plate:
• X1-1, X1-2 (L1)
• X1-3, X1-4 (L2/I0)
• X1-5, X1-6 (L3)
The arc protection system can also be single or two-phase connected. Three-phase connec-
tion is nevertheless recommended for optimal operating speed.
NOTE! The current measuring channels L1 and L3 must be used in connection with two-phase cur-
rent measuring. If only two phases are connected, they should be connected to L1 and L3.
Single-phase current or earth-fault current must always be connected to the current measu-
ring channel L2/I0.
NOTE! The specifi ed operating time of 7ms can only be guaranteed for three-phase current measu-
rement.