L2234
L2778
Emax
28/158
Doc. No.
Model
Apparatus
Scale
Page No.
1SDH000460R0002
For the change over, the customer can use a suitable electronic relay, whose diagram is supplied by ABB SACE. The mechanical interlocks between
two or three circuit-breakers are made by means of cables that can be used for circuit-breakers installed, either side-by-side or one over the other.
Table of feasible mechanical interlocks between two or three circuit-breakers
Type of Number of Type of circuit-breaker Possible interlocks
interlocks circuit-breakers
A TWO a normal power supply unit the first circuit-breaker can be closed only if
and an emergency unit the second (emergency) breaker is open
B THREE two normal power supply units and the first and third circuit-breakers can be
an emergency unit closed only if the second (emergency)
breaker is open. The latter can be closed
only if the first and third are open
C THREE a unit of 2 supplies and a bus-tie. one or two circuit-breakers out of three can
The two half-busbars can be supplied be closed at the same time
by a single transformer (bus-tie closed)
or simultaneously by both
(bus-tie open)
D THREE a unit of 3 supplies / a single only one of the three circuit-breakers can
closed circuit-breaker. Three supplies be closed
(generators or transformers) on the same
busbar for which parallel operation is
not allowed
10.3 Spare parts and retrofitting
Spare parts
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 of 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.
Retrofitting kits
The kits enable SACE Otomax and Novomax G30 circuit-breakers to be replaced, coupling the new circuit-breaker in the old switchboard.
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