4
Connection
The ISOMETER® provides plug-in terminals.
The connections A0/A1 resp. A0/A2 to the supply voltage
U
s
have to be provided with protective
devices according to IEC 60364-4-43. A 6 A fuse is recommended.
Devices for protection against short-circuit in conformity with IEC 60364-4-43 for the coupling of
terminals L1/L2 to the IT system being monitored can be omitted if the wiring is carried out in
such a manner as to reduce the risk of a short-circuit to a minimum. (a short-circuit-proof and
earth-fault-proof wiring is recommended).
An external TEST button or an external RESET button may only be connected to one ISOMETER®.
A parallel connection of several test and reset inputs for collective ISOMETER® testing is not
allowed.
Wiring diagram
Legend
1
Supply voltage
U
s
(see nameplate, technical data on
or ordering information) via 6 A fuse
2, 3
Connection to the 3AC system being monitored:
Connect the terminals L1, L2 to neutral conductor N or
terminals L1, L2 to conductor L1, L2.
4
Connection to the DC systems being monitored:
Connect terminal L1 to conductor L+, terminal L2 to
conductor L-
5
Connection of the AC system to be monitored:
Connect terminals L1, L2 to conductor L1, L2.
6
Separate connection of
and KE to PE
7
External TEST button (N/O contact)
8
External RESET button (N/C contact or wire jumper),
When the terminals are open, the fault message will
not be stored. Factory setting: Memory off!
9
Alarm relay K2
10
Alarm relay K1
IR1575H-435
A0/A1: AC 88…264 V, DC 77…286 V
A0/A2: AC 340…460 V
14
IR1575H_D00416_00_M_XXEN / 03.2021
Connection
