L3447
Emax DC
25/108
Doc. No.
Model
Apparatus
Scale
Page No.
1SDH000635R0002
L3728
Mechanical operations counter
This is connected to the operating mechanism by means of a simple lever mechanism. It indicates the number of circuit-breaker mechanical
operations. The indication is visible on the front of the circuit-breaker from the outside.
Mechanical and electrical trip signalling for overcurrent releases
The following signals are available following tripping of the overcurrent release:
a) Mechanical trip signalling for overcurrent releases
This enables a visual signalling on the operating mechanism by pushing the trip pushbutton in when the circuit-breaker has been opened following
tripping of an overcurrent release. The circuit-breaker can only be closed again by putting the pushbutton back into its normal position included in
the standard configuration.
Reference figure in the electrical circuit diagrams: S51 (13).
b) Electrical and mechanical trip signalling for overcurrent releases
This enables a visual signalling on the operating mechanism (mechanical) and remotely (electrically by means of a changeover switch) of the circuit-
breaker being opened following a trip of the overcurrent releases. To reset the circuit-breaker, it is necessary to reset the mechanical indicator
pushbutton.
Reference figure in the electrical circuit diagrams: S51 (13).
c) Coil for resetting the mechanical release trip indicator
This enables a visual signalling on the operating mechanism (mechanical) and remotely (electrically by means of a changeover switch) of the circuit-
breaker being opened following a trip of the overcurrent releases. With this accessory, you can reset the mechanical indicator with an electronic
relay using a remote control and this enables the circuit-breaker to be reset.
Reference figure in the electrical circuit diagrams: S51 (14)
Auxiliary contacts
Auxiliary contacts installed on the circuit-breaker are available to enable an indication of the circuit-breaker's status. A special version of the auxiliary
contacts is also available (gold plated contacts) for a rated voltage under 24 V (digital signal).
The versions available are:
a) Electrical signalling for circuit-breaker open/closed
It is possible to have electrical signalling of the circuit-breaker status (open/closed) 4, 10 or 15 auxiliary contacts.
The auxiliary contacts can have the following configurations:
–
4 + 2 break/make contacts for PR122/DC-PR123/DC (2 normally open + 2 normally 2 for the release)
–
10 + 2 break/make contacts for PR122/DC-PR123/DC (5 normally open + 5 normally 2 for the release)
–
15 supplementary break/make contacts which can be mounted outside the circuit-breaker.
The basic configuration described above can be modified by the user to indicate normally open or normally closed by repositioning the faston
connector on the microswitch. When 10 contacts for PR122/ PR123 are required, zone selectivity and the PR120/K module are not available.
Reference Fig. in the electrical circuit diagrams: Q/1÷10 (21-22)
b) Electrical signalling for circuit-breaker connected/test isolated/disconnected
In addition to mechanical signalling of the position of the circuit-breaker, it is possible to have electrical signalling by means of 5 or 10 auxiliary
contacts which are installed on the fixed part.
Only available for circuit-breakers in withdrawable versions for installing on the fixed part.
The auxiliary contacts can have the following configurations:
– 5 contacts; group consisting of 2 connected signalling contacts, 2 disconnected signalling contacts and 1 test position signalling contact (main
contacts isolated, but sliding contacts connected)
– 10 contacts; group consisting of 4 connected signalling contacts, 4 disconnected signalling contacts and 2 test position signalling contacts (main
contacts isolated, but sliding contacts connected).
Reference figure in the electrical circuit diagrams: S75I (31-32) - S75T (31-32) - S75E (31-32)
c ) Contact for signalling closing springs loaded
This consists of a microswitch which allows remote signalling of the state of the circuit-breaker operating mechanism closing springs. The contact
is always supplied with the spring loading geared motor.
Reference figure in the electrical circuit diagrams: S33 M/2 - (11)
d) Contact for signalling undervoltage release energized (C.aux YU)
The undervoltage releases can be fitted with a contact (by choise, normally closed or open) for signalling undervoltage energized for remote
signalling of the state of the undervoltage release.
Reference figure in the electrical circuit diagrams: (12)
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
Power supply:
24-30 V AC/DC
220-240 V AC/DC
110-130 V AC/DC
