7.3 Terminal assignment of the 230 V AC relay outputs
DANGER
Warning - hazardous electrical voltage! Danger of electric shock! BEFORE and AFTER
connection it must checked that the 230 V AC relay outputs are off load! Low voltage and safety extra-
low voltage must not be applied together at the relay outputs.
ATTENTION
Fire hazard! On grounds of fire prevention, during the planning of the installation a device for shutting
downthedefrostheatingintheeventofexcessivetemperature(e.g.”KLIXON”)mustbeprovided.
Fuse protection of semiconductor relay (SSR = Solid-State-Relay) terminal 23/24 and 33/34:
Every SSR must be externally fused with a 1.25 A fast acting fuse (FF), nominal voltage 230 V AC, with
a melting integral of << 10.4 A2s and a tripping time at 8.0 A < 10 ms (e.g., SIBA No. 70 001 40). If
large inductive loads (e.g. fan coils) are to be switched via the semi-conductor relay then protective
devices appropriate to the loads must be connected (e.g. an RC element and a varistor) in order to
prevent the destruction of the SSRs due to over-voltage. Information on suitable protective devices as
well as measures for the minimisation of over-voltage can be obtained from the manufacturer.
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