For the change over, the customer can use suitable electronic relay, whose diagram supplied ABB SACE.
Table feasible echanical interlocks between three circuit-breakers
Type f
in rlo cks
Num ber f
circuit-breakers
Type circuit-breaker Possible interlocks
A TWO normal power supply unit
and emergency unit
the first circuit-breaker can closed only if
the second (emergency) breaker open
B THREE two normal power supply units and
an emergency unit
the first and third circuit-breakers can be
closed only the second (emergency)
breaker open.
28/158
. The latter can closed
only the first and third are open
C THREE unit supplies and bus-tie. Three supplies
(generators transformers) the same
busbar for which parallel operation is
not allowed
only one the three circuit-breakers can
be closed
1 rts and retro fittin g
S rts
The spare parts available are:
- Shields and front escutcheon plate
- Opening solenoid for the PR121 PR122 PR123 overcurrent release
- Arcing chamber
- Closing springs
- Clamp-type isolating contact for fixed part the withdrawable circuit-breaker
- Sliding earth contact (for withdrawable version)
- Fixed part shutters
- Complete pole
- Operating mechanism
- Current sensors and connection cables with the release
- Transparent protection for PR121, PR122 and PR123 releases
- SACE PR030/B power supply unit
- Tool case
- Front escutcheon plate for Ronis-type key lock
For further details, ask for the ABB SACE spare parts catalogue. The mechanical interlocks between
two three circuit-breakers are made means cables that can used for circuit-breakers installed, either side-by-side one over the other.
The two half-busbars can supplied
by single transformer (bus-tie closed)
or simultaneously both
(bus-tie open)
one two circuit-breakers out three can
be closed the same time
D THREE unit supplies single
closed circuit-breaker.
Model L2234 Apparatus Scale
L 2778
Doc No' 1SDH000460R0002
Page No.
R fittin its
The kits enable SACE Otomax and Novomax G30 circuit-breakers replaced, coupling the new circuit-breaker the old switchboard
