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L2275
Emax UL
24/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
Mechanical and electrical trip signaling for trip units
The following signals are available following tripping of the trip unit:
a) Mechanical trip signaling for trip units
This allows visual signaling on the operating mechanism by means of pushing the trip pushbutton in when the power circuit breaker has been
opened following tripping of a trip unit. The power circuit breaker can only be closed again by putting the pushbutton back into its normal position.
b) Electrical and mechanical trip signaling for trip units
This allows visual signaling on the operating mechanism (mechanical) and remotely (electrical by means of a changeover switch) of the power
circuit breaker being open following a trip of the trip units. To reset the power circuit breaker, it is necessary to reset the pushbutton for mechanical
indication. The SACE PR112-A and SACE PR113-A trip units are already provided with an internal overcurrent signaling contact.
Reference figures in the electrical circuit diagrams: S51 12
Auxiliary contacts
Auxiliary contacts installed on the power circuit breaker are available which allow signaling of the power circuit breaker status (are also available
in gold plated contact version for digital signal).
The versions available are:
a ) Electrical signaling for power circuit breaker open/closed
It is possible to have electrical signaling of the power circuit breaker status (open/closed) - 4 or 10 auxiliary contacts.
The auxiliary contacts take up the following configurations:
– 4 open/closed contacts (2 normally open + 2 normally closed)
– 10 open/closed contacts (5 normally open + 5 normally closed) - not available when the SACE PR112-A and SACE PR113-A trip units are required.
A group of 15 supplementary open/closed contacts is also available, which can be mounted outside the power circuit breaker. The basic configuration
described above can be modified by the user for indication of normally open or normally closed by repositioning the faston connector on the
microswitch.
Reference figures in the electrical circuit diagrams: Q/1÷10 21 22; Q/11÷25 23
b) Electrical signaling for power circuit breaker connected/TEST ISOLATED/disconnected
In addition to mechanical signaling of the position of the power circuit breaker, it is possible to have electrical signaling by means of 5 or 10 auxiliary
contacts which are installed on the cradle.
Only available for power circuit breaker in draw out version - to be installed on the cradle.
The auxiliary contacts take up the following configurations:
– 5 contacts: group consisting of 2 connected signaling contacts, 2 disconnected signaling contacts and 1 test position signaling contact (main
pliers isolated, but sliding contacts connected)
– 10 contacts: group consisting of 4 connected signaling contacts, 4 disconnected signaling contacts and 2 test isolated signaling contacts (main
pliers isolated, but sliding contacts connected).
Reference figures in the electrical circuit diagrams:S75I 31-32 – S75T 31-32 – S75E 31-32
c ) Contact for signaling closing springs charged
This consists of a microswitch which allows remote signaling of the state of the power circuit breaker operating mechanism closing springs. (It
is always supplied with the spring charging geared motor).
Reference figures in the electrical circuit diagrams: S33 M/2 - 11
d) Contact for signaling undervoltage release energized (aux C. YU)
The undervoltage releases can be fitted with a contact (by choice, normally closed or open) for signaling undervoltage energized for remote signaling
of the state of the undervoltage release.
Reference figures in the electrical circuit diagrams: 12
Current transformer for the neutral conductor outside the power circuit breaker
Only for three-pole power circuit breakers. Allows neutral protection to be carried out by means of connection to the trip unit. (It is supplied on
request).
Reference figures in the electrical circuit diagrams: TI/N 51-52 – UI/N 51-52
Homopolar toroid for the main power supply earthing conductor (star center of the transformer)
SACE PR112 and PR113 microprocessor-based electronic releases may be used in combination with an external toroid located on the conductor,
which connects the star center of the MV/LV transformer (homopolar transformer) to earth. In this case, the earth protection is defined as Source
Ground Return.
The homopolar transformer is available in four different versions in terms of rated current (but keeping the same overall dimensions in any case).
Reference figure in the electrical circuit diagrams: TI/O (51-52)
Un
In max
T
125 V DC
0.3 A
10 ms
250 V DC
0.15 A
10 ms
Un
In max
cos
ϕϕϕϕϕ
250 V AC
5 A
0.3
Characteristics
Rated current
100 A
250 A
400 A
800 A