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.For the change over, the customer can use suitable electronic relay, whose diagram supplied ABB SACE. 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. The latter can closed
only the first and third are open
C THREE unit supplies and bus-tie.
R fittin its
The kits enable SACE Otomax and Novomax G30 circuit-breakers replaced, coupling the new circuit-breaker the old switchboard.
Model L2234 Apparatus Scale
L 2778
Doc No' 1SDH000460R0002
Page No.
28/158
. 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
