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R&D ā USER MANUAL DT0430-E04
If necessary, a system against voltage return needs to be created in the UPS distribution panel as
shown in diagram 2.6b
A: general mains circuit breaker / switch
C: automatic switch or at least a fuse for the mains
B: automatic switch or at least a fuse for the reserve network
K3: protection contactor against return voltage
K1-K2: additional relays on the change-over contact coil supply
UPS
L1-RESERVE
L2-RESERVE
L3-RESERVE
NEUTRAL
L1-MAINS
L2-MAINS
L3-MAINS
NEUTRAL
A B
C
L1
L2
L3
NEUT
K2K1
K3
DISTRIBUTION PANEL
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